Web Forms :: At Initial Page Load Start A Thread

Jun 17, 2010

I have an application that initially display 4 grid views at page load. This process takes 50-60 seconds and I would like to change the process to display the web page, show message like "Data being loaded, please wait..." and then spin off a thread that fills the various grid view. When this is done I would programatically like to do a post back to show the result. Not sure if this is possible? I tried something like this:

[Code]....

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Create A 'thread' To Execute A Function On Page Load / Application Start?

Jan 10, 2011

I need to call a function everytime a visitor visits one of my website's page. But I do not want the execution of the function to interfere with the interface between the user and the website i.e. different thread. What is the best way to do that on ASP.Net?

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Web Forms :: Initial Page Load Slow On Each Page Within A User Session?

Oct 30, 2009

I am trying to solve a problem with a website I look after which is proving a bit tricky!

Problem is this:

1) User visits page A for the first time in a new session, page load is far from satisfactory

2) Same user, within the same session visits page B - Again, load time is poor

3) Same user, within the same session visits page A again, page load is much, much better, ditto for page B

4) User closes browser, starts again - Page load times are slow again

Home page total size, including images, JS, HTML: 350kb - Not exactly slim, but not enough to be causing the slow load time

I did think this was something to do with SSL, so switched off SSL and restested - The behaviour was exactly the same.

I also thought perhaps this was a DNS problem, but this doesnt make sense - Surely the problem would then only exist for the first page viewed (I am assuming a DNS lookup doesnt occur on every HTTP request!)

I know this may not be a ASP.Net related issue, but then again, fair chance it could be, hence posting here.

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Mar 19, 2009

I have a set of thumbnails on a webpage that in the order of 3x3. Next to that set of thumbnails is one update panel. Each thumbnail image is attached to an imageclickeventhandler. Once clicked, the update panel updates with the larger image. That works fine but right now, I'm trying to get the update panel to load the first thumbnail image on the initial load of the page instead of having a blank area. Anyone have any ideas on how this could be done?

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Apr 13, 2010

I a formview object. I have created an edit temple and an empty template Whehn there is data in the table nor probem When my table is empty i got the empty template to display when I click insert I get the error " Form must be in insert mode" How can I tell if there is no data on the page load so I can maybe do this:

formview.f1.defaultmode = fornviewmode.insert

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Jan 22, 2010

I'm writing a simple web site using codebehind for each page, however using the "codefile" directive, not "codebehind" as such, because I'm not precompiling. I'm just using a text editor to edit the aspx and codebehind files. Problem is, every time I make a change to the code or the aspx file, and refresh the page in the browser, it takes a 2 or 3 seconds to come up the first time, like it's doing an on-demand initial compile. I assume that's what it's doing, as after the initial load, the page refreshes without any delay at all.

This behaviour is quite frustrating when making small changes to the html or code. I'm coming from classic ASP, where you could edit-refresh-edit-refresh etc. all day without your "stride" being broken by waiting for a "compile", you know? So I'd love to know if there's a setting which prevents this initial delay. When I want to deploy, I can do a compile or something, but while making lots of small edits, I just need the page to run without that initial delay.

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Jan 29, 2009

I would like to display my manager pic and name on initial page load and then the user has the ability to click on other dept. to view their manager. On page load i am doing a validation test to get the user name and display on the page, when the page first load i would like to run another query taking teamid and show the user manager pic and name initially and then they can click on other depts. How to do this sql query i know it can't be on page load since this would run over n over when the page loads even though the user wants to see other dept managers. Can someone assistant me on how to execute and show something on inital page load?

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Radiobuttonlist And Load Page In Same Initial Position

Jun 17, 2010

I have this simple code in my page, I have a long page, if the client use this button then it shall reload the page and display the page from the beginning. I wish to be reload the page and display from the last position.

<asp:RadioButtonList ID="RadioButtonList5" runat="server" AutoPostBack="True"
RepeatDirection="Horizontal">
<asp:ListItem Value="45">Sheet2</asp:ListItem>
</asp:RadioButtonList>

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Set Dropdownlist Selected Value On Initial Page Load

Jul 22, 2010

I posted a similar question previously, but none of the answers worked and I've been scouring all over the web trying to find a solution. My situation, I have a Edit Window webform with a dropdownlist (Note: to avoid confusion, I'm using Telerik extensions only to decorate the webform):

<%@ Page Language="VB" CodeFile="EditFormVB.aspx.vb" Inherits="EditFormVB" %>
<%@ Register Namespace="CustomBoundField" TagPrefix="custom" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Edit Pop-up</title>
</head>
<body class="">
<form id="form1" runat="server">
<div>
<script type="text/javascript">
function CloseAndRebind(args) {
GetRadWindow().BrowserWindow.refreshGrid(args);
GetRadWindow().close();
}
function GetRadWindow() {
var oWindow = null;
if (window.radWindow) oWindow = window.radWindow; //Will work in Moz in all cases, including clasic dialog
else if (window.frameElement.radWindow) oWindow = window.frameElement.radWindow; //IE (and Moz as well)
return oWindow;
}
function CancelEdit() {
GetRadWindow().close();
}
</script>
<asp:ScriptManager ID="ScriptManager2" runat="server" />
<telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" Skin="Vista" DecoratedControls="All" />
<br />
<br />
<asp:DetailsView ID="DetailsView1" DataKeyNames="ID" runat="server" AutoGenerateRows="False"
GridLines="None" DataSourceID="detailsSqlDataSource" Height="50px" Width="125px"
BorderWidth="0" CellPadding="0" CellSpacing="7">
<Fields>
<asp:BoundField DataField="TS_DESCRIPTION" HeaderText="TS_DESCRIPTION" SortExpression="TS_DESCRIPTION" />
<asp:BoundField DataField="TS_TITLE" HeaderText="TS_TITLE" SortExpression="TS_TITLE" />
<asp:CommandField ShowEditButton="True" />
<asp:CommandField ShowInsertButton="True" />
</Fields>
</asp:DetailsView>--%>
<telerik:RadScriptManager ID="RadScriptManager1" runat="server" />
<telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" Skin="Vista" />
<br />
<br />
<asp:DetailsView ID="DetailsView1" runat="server" Height="400px" Width="745px"
AutoGenerateRows="False" DataKeyNames="TS_ID" DataSourceID="SqlDataSource2"
EnableModelValidation="True">
<Fields>
<asp:TemplateField HeaderText="Category">
<EditItemTemplate>
<%--<asp:DropDownList ID="TTCategory" runat="server" DataSourceID="ReqCategoryData" SelectedValue='<%# Bind("TS_NAME") %>' />--%>
<asp:DropDownList DataSourceID="ReqCategoryData" DataTextField="ReqCategory" DataValueField="ReqCategory"
ID="reqCategoryDropDown" runat="server" AppendDataBoundItems="true" AutoPostBack="true" >
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:CommandField ButtonType="Button" EditText="Update" ShowEditButton="True"
ShowCancelButton="True">
<ItemStyle HorizontalAlign="Center" />
</asp:CommandField>
</Fields>
</asp:DetailsView>
</div>
</form>
</body>
</html>

And in the code behind, I'm setting the datasource for the dropdownlist and using a function to query the DB for the name of the value I want to set as the selected value when the page loads initially: Partial Class EditFormVB Inherits System.Web.UI.Page

Public Shared category_Name As String = ""
Dim ddlDataSource As New SqlDataSource
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
DetailsView1.DefaultMode = DetailsViewMode.Edit
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.Page.Title = "Editing record"
''Setup DropDownList SqlDataSource
ddlDataSource.ID = "ReqCategoryData"
Page.Controls.Add(ddlDataSource)
ddlDataSource.ConnectionString = ConfigurationManager.ConnectionStrings("TTPRODReportsQuery").ConnectionString
ddlDataSource.SelectCommand = "SELECT TS_NAME AS ReqCategory FROM dbo.TS_SELECTIONS WHERE (TS_FLDID = 5299 AND TS_STATUS = 0) ORDER BY TS_NAME"
Dim args As New DataSourceSelectArguments
ddlDataSource.Select(args)
''Set max length of Title field to 70 characters
Dim dvrTest As DetailsViewRowCollection = DetailsView1.Rows
Dim TitleTB As TextBox = dvrTest.Item(0).Cells(1).Controls(0)
TitleTB.Attributes.Add("onkeydown", "isMaxLen(this)")
TitleTB.Attributes.Add("maxlength", "70")
Dim myDDL As DropDownList = DetailsView1.FindControl("reqCategoryDropDown")
''Perform dropdown list population operations
If Page.IsPostBack = False Then
Dim ticket_ID As String = getDataKey(DetailsView1)
''Fetch Category ID
Dim sqlText As String = "SELECT TS_REQCATEGORY FROM USR_ITFAC WHERE (TS_ID = " + ticket_ID + ") "
Dim reqDataReader As SqlDataReader = GetDataReader(sqlText)
reqDataReader.Read()
Dim category_ID As String = reqDataReader(0)
''Fetch Category name using the categoryID and set as selected value in dropdown list
sqlText = "SELECT TS_NAME FROM TS_SELECTIONS WHERE (TS_ID = " + category_ID + ") "
reqDataReader = GetDataReader(sqlText)
reqDataReader.Read()
category_Name = reqDataReader(0)
myDDL.DataBind()
myDDL.Selectedvalue = category_Name //<--this value gets set only when debugging,
End If
End Sub
Private Function GetDataReader(ByVal sqlText As String) As SqlDataReader
Dim dr As SqlDataReader
Dim sqlConn As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("TTPRODReportsQuery").ConnectionString)
sqlConn.Open()
Dim sqlCmd As SqlCommand = New SqlCommand(sqlText, sqlConn)
dr = sqlCmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
Return dr
End Function
End Class

The dropdownlist does get populated appropriately, however when I attempt to set the value, it doesn't reflect when the page loads; the dropdownlist just gets populated and no value is set to selected in the markup, so the first value is shown by default. The odd thing is that when I'm debugging, the value appears to get set when I step through the function, it's as if the selectedvalue is getting reset as soon as the function exits and proceeds to load the page.

SOLUTION: Had to add a separate function that is called onLoad from the DropDownList after the after Page_Load is done executing. Still unresolved is why the the DropDownList rebinds after the Page_Load.

IN HTML:
<asp:DropDownList DataSourceID="ReqCategoryData" DataTextField="ReqCategory" DataValueField="ReqCategory"
ID="reqCategoryDropDown" runat="server" AutoPostBack="true" OnLoad="DDL_DataBound">
IN CODE-BEHIND
Public Shared category_Name As String = ""
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.Page.Title = "Editing record"
''Setup DropDownList SqlDataSource
ddlDataSource.ID = "ReqCategoryData"
Page.Controls.Add(ddlDataSource)
ddlDataSource.ConnectionString = ConfigurationManager.ConnectionStrings("TTPRODReportsQuery").ConnectionString
ddlDataSource.SelectCommand = "SELECT TS_NAME AS ReqCategory FROM dbo.TS_SELECTIONS WHERE (TS_FLDID = 5299 AND TS_STATUS = 0) ORDER BY TS_NAME"
Dim args As New DataSourceSelectArguments
ddlDataSource.Select(args)
''Set max length of Title field to 70 characters
Dim dvrTest As DetailsViewRowCollection = DetailsView1.Rows
Dim TitleTB As TextBox = dvrTest.Item(0).Cells(1).Controls(0)
TitleTB.Attributes.Add("onkeydown", "isMaxLen(this)")
TitleTB.Attributes.Add("maxlength", "70")
Dim myDDL As DropDownList = DetailsView1.FindControl("reqCategoryDropDown")
''Perform dropdown list population operations
If Page.IsPostBack = False Then
Dim ticket_ID As String = getDataKey(DetailsView1)
''Fetch Category ID
Dim sqlText As String = "SELECT TS_REQCATEGORY FROM USR_ITFAC WHERE (TS_ID = " + ticket_ID + ") "
Dim reqDataReader As SqlDataReader = GetDataReader(sqlText)
reqDataReader.Read()
Dim category_ID As String = reqDataReader(0)
''Fetch Category name using the categoryID and set as selected value in dropdown list
sqlText = "SELECT TS_NAME FROM TS_SELECTIONS WHERE (TS_ID = " + category_ID + ") "
reqDataReader = GetDataReader(sqlText)
reqDataReader.Read()
category_Name = reqDataReader(0)
myDDL.DataBind()
End If
End Sub
Protected Sub DDL_DataBound(ByVal sender As Object, ByVal e As System.EventArgs)
If Page.IsPostBack = False Then
Dim myDDL As DropDownList = DetailsView1.FindControl("reqCategoryDropDown")
myDDL.Items.FindByValue(category_Name).Selected = True
End If
End Sub

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Feb 14, 2011

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May 14, 2010

I've searched around a lot, and honed this problem down to this case: I'm using the PRG pattern, pragmatically I'm using the same DTO for my post/get actions. It looks like when I have the dto with the data annotation attributes in the get action parameter list, the validation is always displaying errors, every time on initial page load. In some cases this could be desired behavior if you put asterisks in the error message, but how do I get rid of it?

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Nov 3, 2009

I have a gridview whose data is populated from an object datasource. Now since this data loading happens on initial page load , i want to render the other two controls (Text box and a Button) on the page and show "Loading" text or image in place of the gridview till all the data is retrieved. I read around the forums and saw that to make this work I need to use UpdatePanel, ScriptManager and UpdateProgress controls.

I have embedded the gridview in the ContentTemplate Tags of update panel . I also associated the ID of the panel to the update progress control. Now only thing i'm left with is how to make the initial page load trigger the gridview after the whole data is retrieved.

here is the code i got so far

[Code]....

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Jul 23, 2010

I am not sure what I am doing wrong in how I set up validation on my models and viewmodels. For some reason on several of my views that contain a validation summary, it appears empty on initial load of the page. On some other pages it appears correctly when the form's data is posted and it does not appear on initial load, this is the way that I would expect it to work.

On the views where this is occuring, my viewmodels are somewhat more complex in that they contain another complex type that I am passing around that has it's own set of DataAnnotation Validation properties, but I have called the validation summary like this; Html.ValidationSummary(true) so that those properties are not validated.

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Dec 8, 2010

Over the last week I've been investigating an issue for one of our clients whereby the initial page load following a deployment of their website takes around 1 minute, resulting in unacceptable downtime for end users. This was happening not only for code deplyments (bin dll's and .config files) but also if there were large numbers of .aspx pages updated. For code deployments it's not an issue, but for aspx updates it is; in this particular scenario, we are making use of a 3rd party content management system (RedDot from OpenText) in which every page of the site is published out as a distinct .aspx page. This means that for this website there's somewhere in the region of 2,400 separate .aspx pages. I realise this isn't an ideal situation but we're working within the constraints of the CMS, and we managed to correlate the instances where the site was unresponsive with App pool restarts, which also corresponded to publications of of .aspx pages.

I found an article by Tess Ferandez [URL] which describes all the reasons why the app pool may restart, and it does seem that if more than 15 .aspx pages are changed then the app pool will recycle and the pages will be re-compiled. Another msdn article [URL] then gave me a few pointers on how to start addressing this problem, and for the moment I've set a flag on the compilation options to prevent batch compilation:

<compilation batch="false">

This means that the initial page load now takes around 6 seconds instead of 1 minute, which is a great improvement. However, I also used the "Compilations Total" performance counter to investigate the number of pages that have been compiled by ASP.NET for my site and was quite surprised that the total number of pages that get compiled peaks at 44, which is odd given that there are 2,400 aspx pages in the site. If the batch flag is set to false, the counter slowly increments by 1 page at a time as you click around on the site; if batch mode is true, the initial compilation takes the number straight to 44 over the course of ~60 seconds. What I'm really struggling to understand is why all 2,400 pages aren't compiled. Does anyone have any inside info on what might be going on as all the documentation I've read seems to indicate that all of the pages should be compiled and this counter should be much higher.

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Jul 16, 2010

check this code about threading ..

i am getting different o/p every time. just i want to start the thread ,suspend that thread and resume that thread .

namespace ThreadTest
{
class Program
{
static void Main(string[] args)
{
Thread th = new Thread(new ThreadStart(new Program().Call));
th.Start();
Console.WriteLine("STARTED");
th.Suspend();
Console.WriteLine("SUSPENDED");
th.Resume();
Console.WriteLine("RESUMED");
Console.ReadLine();
}
public void Call()
{
for (int i = 1; i < 200; i++)
{
Console.WriteLine(i.ToString());
}
}
}

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Sep 2, 2010

i have the code for asynchronous call to the database. i execute the sql command into the begin method that will executed onto the separate thread. now i want to execute the another database call asynchronously so that this also execute onto the separate thread. code for one database cal is here....

private SqlConnection con, con1;
private SqlCommand cmd, cmd1;
private SqlDataReader dr, dr1;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
AddOnPreRenderCompleteAsync(new BeginEventHandler(Begin),
new EndEventHandler(End)
);
}
}
/////////////BEGIN METHOD
IAsyncResult Begin(object sender, EventArgs e,AsyncCallback cb, object state)
{
string connect = "Data Source=.\SQLEXPRESS;Asynchronous Processing=true;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True";
con = new SqlConnection(connect);
con.Open();
cmd = new SqlCommand("SELECT FirstName,LastName,Age,Company,Profile FROM Person",con);
return cmd.BeginExecuteReader(cb, state);
}
//////END METHOD
void End(IAsyncResult ar)
{
dr = cmd.EndExecuteReader(ar);
Label2.Text = System.Threading.Thread.CurrentThread.GetHashCode().ToString();
GridView1.DataSource = dr;
GridView1.DataBind();
}

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Aug 26, 2009

when loading an ASP.NET webpage that's been idle for, say, 20-30 minutes, why the initial load takes 5-6 seconds and all subsequent loads take under a second? Since, in many situations, I'm loading less than 100 records from a table in SQL Server over to the page, 5-6 seconds seems a tad excessive. Is there anything I can do to make that initial load time as speedy as the subsequent load times?

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Apr 30, 2009

Does anyone out there understand the loading hierarchy of the main thread and the background thread when IE7 loads a page?

The reason I ask is because an animated gif that we have will not render it's animation in IE7. With Firefox & Safari there is no problem.

We can do a conditional statement with - window.addEvent('domready', function() - and then put the code inside that function and it runs ok.

This is not the first time that I have had problems with animated gifs loading in IE7. What's the deal IE?

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Dec 1, 2010

I have several divs on an asp page. All of my divs are runat="server". On the initial load of my page I set all the divs visible property to false because I dont want them to appear on the first show. Then, I have a drop down list raising postback events.

On the selected index changed event I am setting the visible property of my divs to true to make them appear on the page. However this does not work.

I discovered that, on the initial load non of my divs are added to the page's html content. So, on a postback event non existing divs can not be made to appear. If all the divs would set to visible = true on the initial load, postback event would work just expected.

Could any one tell me a way to hide divs on the initial load and make them appear on a postback event?

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Feb 11, 2011

I want to start a new thread to query a database while my web application continues running. I was under the impression that by using threads I can run the querying process independently while the normal web application page cycle carries on, but I could be wrong.

public class DbAsyncQuery
{
Dictionary<string, object> serviceResults = new Dictionary<string, object>();
public void UpdateBillingDB()
{
QueryAllServices();
foreach (KeyValuePair<string, object> p in serviceResults)
{
IEnumerable results = (IEnumerable)p.Value;
IEnumerable<object> sessions = results.Cast<object>();
DbUtil.MakeBillingDBEntry(sessions, p.Key);
}
}
public static string[] servicesToQuery = new string[] // Must go in config file ultimately
{
"xxx.x.xxx.xx"
};
public delegate void Worker();
private Thread worker;
public void InitializeThread(Worker wrk)
{
worker = new Thread(new ThreadStart(wrk));
worker.Start();
}
public void InitializeQuery()
{
Worker worker = QueryAllServices;
InitializeThread(worker);
}
private void QueryAllServices()
{
Dictionary<string, DateTime> lastEntries = DbUtil.GetLastEntries();
foreach (string ip in servicesToQuery)
{
string fullServicePath =
"http://" + ip + ":800/MyWebService.asmx";
//object[] lastEntry = new object[] { lastEntries[ip] };
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serviceResults.Add(ip, obj);
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}
}

It seems to basically stall and wait to finish the query before loading the page (which can be thousands of rows, so it takes awhile). I put this in the following section of Global.asax:

protected void Application_Start(object sender, EventArgs e)
{
DbAsyncQuery query = new DbAsyncQuery();
query.UpdateBillingDB();
}

This is one of my first web pages, and I'm new to threading. I understand there is a difference between creating your own thread and using the ThreadPool. In this method, I am using my own thread, I think. Not sure if that's the best way. The querying process can be completely independent, and its only going to occur on scheduled intervals (every 8 hours or so). The user doesn't need to have up to the minute data, so it can take awhile. I just don't want the site to wait for it to finish, if that's possible.

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Jun 14, 2010

I have an application where different users can log in via a single portal login. When they log
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public class CustomPage : Page
{
protected void Page_PreInit(object sender, EventArgs e)
{
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{
Page.Theme = Globals.Company.CompanyName;
}
else
{
Page.Theme = "Default";
}
}
}

When the customer belongs to more than 1 company, and they select the company they belong to, the theme loads just fine. So, the problem I am having is this: If they belong to just 1 company, the company is automatically selected but the theme does not load right away. However, if I refresh the page, the theme loads just fine. Even the default theme will not load. The page has no css at all until I refresh.

I even view source and look for my css names and they are not there. I refresh and do the same thing, and they are there. I am not using forms authentication and the default theme in the web config is "Default"

<pages theme="Default">

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Apr 2, 2010

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Cross-thread operation not valid: Control 'checkedListBox1' accessed from a thread other than the thread it was created on.

i have tried invoke required but again got the same error. Sample code is below:

[code]....

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Oct 5, 2010

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[Code]....

But as soon as the code is wrapped in an if (IsPostBack) condition as shown below, FileUploaded no longer fires, even though the code is otherwise identical:

[Code]....

Would anyone be able to shed some light on why this is happening?

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Nov 3, 2010

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I traced this down and checked the current thread's culture. For 99% of the time it's en-US, but on the first load of the MVC view after compiling it is set to en-GB. If I reload the page immediately after that, it's back to en-US.

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Apr 11, 2010

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2010-04-10 11:58:38,083 - Application_Start
2010-04-10 11:58:38,111 - Application_BeginRequest
2010-04-10 11:58:38,117 - Application_AuthenticateRequest
2010-04-10 11:58:52,321 - Session_Start
2010-04-10 11:58:52,454 - Page_Load
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2010-04-10 11:58:53,981 - Application_EndRequest

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Jan 11, 2011

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My .aspx is as follows:

<telerik:RadComboBox
ID="SomeFilter" runat="server"
EmptyMessage="Choose..."
OnClientSelectedIndexChanging="OnClientSelectedIndexChanging"

[Code].....

My combobox defaults to "Test1" by default instead of "Choose...". Once I open and close the combobox, however, the default changes to "Choose...".

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For example, if I load the .aspx page, select a StartYear of 2005 from the first dropwdown and EndYear of 2009 from the second dropdown, and click "Run Report". The report displays, but instead of using my dropdown selections, it uses the dropdown default values. Also, the dropdown selections I made are not preserved (they go back to the default values).

However, if I then make new selections and click "Run Report" again, the report displays correctly and my dropdown selections are preserved as I hoped they would be the first time I ran the report. Has anyone run into this problem before? It appears everything is working correctly, it's just that initial load that is causing the problem.

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[code]...

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Is this a common problem among unpopular sites that doesn't get that many hits in a day? And is the only way to solve it to "ping" the site to keep it alive?

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