Web Forms :: DataTable - Click Button1 DTNav Is Null?
Jan 31, 2011public
partial class
_Default : System.Web.UI.Page [code]....
in above code when i click button1 DTNav is null .........
Similar Messages:
AJAX Doesnt Work / Click On Button "Button1" / Should Execute But The Whole Page Submits?
May 10, 2010I have a very simple AJAX example that doesn't work.It is from the Microsoft tutorials on AJAX.
When I click on button "Button1" AJAX should execute but the whole page submits.
Here is the code:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="1111.aspx.cs" Inherits="_1111" %>
<%@ Register Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI" TagPrefix="asp" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<p>
DropDownList AutoPostBack SelectedIndexChanged EventArgs Sort ... Since you will be using AJAX to process your SelectedIndexChanged event, set the AutoPostBack property of the DropDownList to false. ...
</p>
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true">
</asp:ScriptManager>
<asp:Label ID="label2" runat="server"></asp:Label><br />
<asp:Label ID="label3" runat="server"></asp:Label><br />
<center>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="label1" runat="server"></asp:Label>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button 1" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</center>
</div>
</form>
</body>
</html>
Code-behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _1111 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
label1.Text = System.DateTime.Now.ToString();
label2.Text = System.DateTime.Now.ToString();
label3.Text = System.DateTime.Now.ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
label1.Text = System.DateTime.Now.ToString();
}
}
AJAX :: Js: Document.getElementById("button1").click(); Not Working In Asp.net Ajax?
Mar 19, 2010Before I use magic ajax, it was not a problem that if it's not ajax call, I can perform document.getElementById("button1").click();
However, in asp.net ajax extension, I can not do this and it reports a run time ajax error:
Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
What happens is, in my code, I have a facility to check if the user change any data they just input every 5 minutes. If yes, I will do a save function without notifying the user. and all the things are done on client side. So I have to use javascript, however, I could not user button.click() on js anymore.Is there any other way to call a server side function (code behind) by javascript?
Forms Data Controls :: Why DataTable Always Returns Null
Oct 7, 2010Since I am not using a DataSourceId at the markup I am having to create my own Sorting handler. I found a sample on MSDN but the variable 'dataTable' always returns null why?
[Code]....
and here is how I am feeding the DataGrid:
[Code]....
C# - How To Find Null Values In A Datatable
Mar 10, 2011I have a data table say i have a column like x which is primary key so i should get the row where this x values in empty.
View 2 RepliesADO.NET :: DataTable Getting Null In Business Layer?
Aug 6, 2010My application has a three tier architectute
UI Business DataAccess Here, I'm calling a SP from Data Access layer which will populate a DataTable and return the DataTable back to Business. My source code is like below.
[Code]....
Here, when I set debugpoint I can see the DataTable is getting populated by the data so my
sp idreturning the data. there is no issue with the sp and dataaccess layer method. The problem lies below on my business layer. The source code is like below.
[Code]....
DataTable.Rows.Find Returns Null
Feb 13, 2010I have a DataTable for which a PrimaryKey constraint has been set to be a combination of an integer column and a datetime column. When I try to 'Find' a row by saying,
dtFunds.Rows.Find(iContainerIndex)
I get a null value. iContainerIndex has been defined as an object array of size 2 with the integer ID and date values in it.
When I set a breakpoint in my code, I see that the very same values are present in the datatable.
If I try to execute, DataTable.Select() method with the integer column filter, I get a result - but returns no result when called with the date column filter.
What am I doing wrong here? The very same DateTime value is present in the datatable.
ADO.NET :: LINQ Over DataTable Null Decimal Field ?
Feb 9, 2011I'm having a spot of trouble figure out how to write my linq query so that is allows a decimal field in my datatable to be null
Right now I have this:
[Code]....
But it's not working. The error I am getting is: Cannot cast DBNull.Value to type 'System.Decimal'. Please use a nullable type.so how do I get it to allow program_ar_id to be null?
Button1.Disable=false Doesn't Happen Immediately?
Dec 13, 2010I have a Wizard which has a FileUpload in one of the steps. It also has an "Upload" button. When the user browses to a file, and clicks Upload, I upload the file into SQL.
There seems to be some synchronization problem for very large files, and I would like to disable the Wizard's Next button until the Upload of the file to SQL completes. It can take a while, especially on a wireless PC.
In my OnClick event for the Upload button, I am trying to disable the Next button. The code, which is below, appears to be correct, but the Next button doesn't actually disable until the Query completes. Can I get the Next button to disable immediately instead of after the SQL Update completes?
Here is my code:
Protected Sub JustificationDocUploadButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles JustificationDocUploadButton.Click
If RequestJustificationAttachment_FileUpload.HasFile Then
Dim obj As Object = Wizard1.FindControl("StepNavigationTemplateContainerID")
Dim startButton As Button = obj.FindControl("StepNextButton")
startButton.Enabled = False
SqlDataSourceJustificationAttachment.Update()
End If
End Sub
ADO.NET :: How To Handle Null While Converting From My Datatable To List Using LINQ
Aug 27, 2010I am converting my datatable to LISt using LINQ how do I handle nulls coming from database
List<Port> portDetails = new List<Port>();
DataTable dt = ds.Tables[0];
portDetails = (from q in dt.AsEnumerable()
select new Port
{
PortCode = q.Field<string>("Code"),
ExtCode = q.Field<string>("Nb"),
Name = q.Field<string>("Name"))
}).ToList();
In the above query if Code is null I do not want property portcode to be set to the value it should only set if it is not null or not blank
PortCode = q.Field<string>("Code"),
What should be syntax
I was trying somethign like this which doesnt work
Portcode = q.Field<bool>("Code") == null ? null : q.Field<bool>("Code")
Forms Data Controls :: Update Datatable When User Click Check Box
Jun 3, 2010I have gridview wich bind with dynamic datatable.
<asp:GridView ID="grdCountries" runat="server" AutoGenerateColumns="False" ShowHeader="False" OnRowDeleting="grdCountries_RowDeleting" DataKeyNames="country_id" BorderStyle="None" GridLines="None">
AJAX :: UpdatePanel - GridView - DataSource Null - Get The Datatable To Persist Between The Two Update Panels?
Jan 17, 2010I am going to outline my setup then where i am failing
UpdatePanel1 - Contents : 3 textboxes and AddButton
UpdatePanel2 - Contents : 1 GridView and SubmitButton
AddButton adds new row to DataTable with data from textboxes, binds DataTable to GridView SubmitButton sends data to database. The Adding of a row works to add the row to the gridview, but it won't add a second or third and so on, only adds the 1. SubmitButton belives the DataTable that GridView is databound to is null and won't send anything to the database. How can i get the datatable to persist between the two update panels? Do i use Sessions as my storage location? Page
[Code]....
Data Controls :: Handle NULL Values When Converting DataTable Cell Value To String In C#?
Dec 23, 2015How to allow null value on my program?
for below statement, "WARNING_TYPE" IS NULL..
but when I run, it promp me error..what are the correct statement should i write. tq all
l_Connection.ConnectionString = constr
l_Command.Connection = l_Connection
l_Command.CommandType = CommandType.Text
l_Command.CommandText = " SELECT UNP.EMPLOYEE_ID, UNP.UNPAID_DAYS, ABST.ABSENT_DAYS, WARN.WARNING_TYPE " +
[code].....
Forms Data Controls :: Handling A Null Value In Textbox FormView (on Button Click To Calculate Totals)
Mar 17, 2011I have a rather large formview that asks for a variety of input values (physical totals vs pos report totals). I have created vb code to calculate the differences and subtotals of various types prior to inserting the data so people can check for entry errors.
Its a closing reconciliation form. Here's the problem: If they forget to enter 0 in a field that doesn't have any totals, a big ugly error message displays. I would like to avoid this. I can tell them until I am blue in the face to remember to enter 0 and not leave any blank fields, but realistically its going to happen and I need to handle it in the programming.
I have been struggling to either default the values to zero to start with, replace a null textbox with 0 before the calculate runs...but I can't get anything to really work. What is the best way to handle this?
Here is the aspx page:
[Code]....
And the code behind page with working "Calculate" as long as fields are not left blank (I took out all the test code that made it not work at all)
[Code]....
Finally, the error message I am getting is the following:
[Code]....
I can't seem to find the right combination of programming to account for the "" string to be 0 so that it will add or subtract values in my calculate. I have my sql table setup with default values of 0 so if a field is left blank it will be entered into the database as 0 and not null. It is really just for my inserting of a reconciliation and the running of Calculate Totals to double check their work prior to inserting into the database.
Button Click Return Null Value?
Jul 4, 2012this code runs fine for single row <tr> </tr>, but when i  use multiple table rows as given below javascript alert box shows  null value ,, how can i correct  my script for it ??
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
[Code]......
Error "DataTable Is An Ambiguous Reference Between System.Data.DataTable And Microsoft.Office.Interop.Word.DataTable"
Jan 20, 2011'DataTable' is an ambiguous reference between 'System.Data.DataTable' and 'Microsoft.Office.Interop.Word.DataTable'
View 3 RepliesForms Data Controls :: Set A Column In A DataTable To Be A Primary Key For An Existing Datatable
Apr 2, 2010If I am passed a datatable and I cant change the column structure..is there anyway to set an existing column to a Primary key so I can easily Find() the row I am looking for?
View 1 RepliesForms Data Controls :: Displaying A Null Or Empty Cell For A Null Datetime Database Value In Gridview?
Dec 6, 2010I have setup my business object to have a create_date and edit_date members both datetime datatypes. My company want to display the create_date and edit_date fields in a gridview for each transaction. The problem i have is that after insterting a record it will have a valid create_date but no edit_date and when displayed in the gridview it defaults to datetime.minvalue (My default). How on earth do i show an empty field in my gridview for a null datetime field in the database?
I am using similar architecture to the Imar Spaanjaars example of a tiered solution. With a few small tweeks it has worked well for me for ages. I am passing a List<Database> to my object datasource which connects to my gridview.
Web Forms :: Session Variable Is Null When It Shouldn´t Be Null?
Mar 18, 2010I have a problem with a SessionVariable. I will explain what is happening:
1. From the default.aspx I send Session["LoginByAdmin"] = "Dummy"; and then redirect to this page where I have the code below. So the Page_Load sees that this Session["LoginByAdmin"] != null and enter this page. This works fine !
2. In the Page_Load, I later fill a ListBox1 with foldernames.
3. With Button1_Click1, I will now delete the choosen Folder in the ListBox1 wich works fine the first time and the ListBox updates the new existing folders in the ListBox. (I have wrapped this inside an updatepanel)
The problems comes now when I try to delete a choosen folder in the ListBox1 the second time in a row. When I select a Folder in the ListBox1 and now Press Button1, I will be redirected to "Default.aspx". This meens that this code is running: (That meens that Session["LoginByAdmin"] == null and I have not set this to null anywhere. This is my big question how this variable can be = null here?
if (Session["LoginByAdmin"] == null)
Response.Redirect("Default.aspx");
break;
[Code]....
Web Forms :: UpdateParameters.Add Uses The Word NULL Instead Of NULL Value To Sql Db
Jan 5, 2011In my code behind, I have the following code that I want to insert a null value for a parameter. Instead of doing that, it is adding the word "NULL" to my database. What am I doing wrong?
dsRevealedByCR.UpdateParameters.Add("txtGrantor","Null")
Pass Datatable To The Mvc View Error / CS0246: The Type Or Namespace Name 'DataTable' Could Not Be Found
Sep 28, 2010I was reading: [URL]
But I have give a compilation error:
CS0246: The type or namespace name 'DataTable' could not be found (are you missing a using directive or an assembly reference?
DataSource Controls :: How To Copy The Data From One Datatable To Another Datatable Based On The Schema
Jan 11, 2010i have the dataset with one table.Table contains three column like 'Name','Location','Pin'.I would like to move the data from another table based on schema.
View 2 RepliesData Controls :: Copying Specific Records From One Datatable To Another Datatable
Aug 22, 2012im trying to copying specific record from one datatable to another datatable i used below code
public System.Data.DataTable selectspecificdatarow(System.Data.DataTable dtg, int count, int startindex)
{
System.Data.DataTable dtn = dtg.Clone();
for (int i =startindex; i < count; i++)
[Code]....
its taking too long time in cloneing is there any better way to do this task which is Time effecent
C# - How To Join Two Datatable Datas Into One Datatable To Show In One Gridview
May 24, 2010how to join two datatable datas into one datatable to show in one gridview
i.e in 1 datatable i have username and pwd and in another datatable i have that user details. how to show all these in one datatable to get those values display in gridview(asp.net)
Web Forms :: Microsoft JScript Runtime Error On Page - "null" Is Null Or Not An Object
May 17, 2010m getting this error again and again. i m also using the ajax modalpopup extender in my page ..
View 3 Replies