Which one is faster? For a dropdownlist binding it the first time and using ViewSate or Turning of viewstate, keeping the data in a static datatable and binding the dropdownlist each time on a postback
View 7 RepliesI will get required data from the web method that returns as table!!!
[System.Web.Services.WebMethod]
public static DataTable call(String code)
{
SqlConnection con = new SqlConnection();
SqlCommand cmd = new SqlCommand();
[Code] .....
i have 2 dropdown list and i need to create a Generic method so that I an reuse it...
View 1 RepliesI have a Gridview and two link button in that GridView , one link button click is to add edit row ( Edit ), one link button click is to select row ( Select ). I have a dropdownlist inside row which selected when i click link button Select in the gridview edit template, as of my business logic i need to show the dropdownlist only when the user clicks Edit button and when the user clicks Select button . That mean when the user clicks Select button then they clicks Edit button on the gridvview i should allow him to edit the dropdownlist (showing the value to the user through a label).
ASPX CODE
[Code].... C#
When I click Select link button , then I click Edit link button . They have errors : Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index" I don't know what error?. How to fix it
my understanding static/shared objects will be saved in a memory that is shared by all instances of the asp.net application,so if we set a value to shared object from inst1 & i should be able to access it via instance2(may be in same computer or anywhere)Actually:In my vb.net application,previously they defined shared dataset to hold some information specific to the user,still now i cant reproduce the error that same value shared across all application instances.Please help me to solve or clarify this.
[URL]
I know the big difference, but one thing is confusing me. Cache works only on a single machine on webfarm and to make it globally we use Velocity or memcache.So is static does same, or is it already work globally ?
eg
Cache["someid"] = "value"; //this will only work on single machine cache,
static string abc = "value"; // will this work on single machine or globally ?
Currently I have my data cached in Datasets in a static class. I was talking to my cousin's husband, who works as a C# developer for our local Telecom company.
Basically, I'm pretty new to ASP.NET and although to me having cached data in a static class makes sense to me, when I talked to him about it, he said there might be a problem when the site goes live, as on a web server more than one instance of the class may be created.
He did say this was a theory, and it was an area he didn't know an awful lot about, so I thought I'd ask some of you ASP.NET gurus to see if what I've done is totally wrong or not.
I am working on rewriting an application. The previous developers have declared some Private static hashtables within a class in a class library. The first time when the application runs, this hashtable gets populated by running the query. After that this hastable is refrenced elsewhere to get the employee information.Even if the employee is removed from the DB, he is still able access the application, Since the private static hashtable holds the employee information. I totally understand that the hashtable is referenced to prevent the DB calls everytime.
The problem is even after closing the browser and restarting the application the hashtable holds the employee information. How do i get clear this so that it calls the DB?
I am creating a static variable and adding to session.This variable has value that is user specific. Now I am getting a problem with this users are complaining that they are getting values that should be another users. It's like a mix up with session. Could this be because of static variable declaration?
View 2 RepliesWhat is difference between Application object and static variable? Where these are stroed in memory.
View 4 RepliesI want to know , how good / bad is it to save configuration values in a static properties?I am creating an application which reads configuration from an XML file and a DataContext file, instead of sending the CustomConfig class into the configuration.xml each time I tought about using an ReadXml() method on application_start at the global.ascx
the ReadXml() method would save the data in static properties of CustomConfig and whereever I would want to read that particler data I would ask CustomConfig.PROERTY_NAME
My question is ? how smart it is ? how long does IIS would save the data in a static member? (if as long as the application exists then I'm ok as long as I add the ReadXml() in the application_start)
I need to keep a global variable throughout the whole time the user is at my site, but do I use Application or a static class? The string variable should store a region name and my site makes a few changes depending on which region that has been set.
I read that Application was mainly for classic ASP, but I also read that a static class cannot be instantiated at runtime (e.g. when the user has logged in).
So, have I got something wrong here and which solution do I use?
Into my application there is EditAds.aspx page where the user get a link on his email after he add an Ad into my application. My inquiry is can i bind the cascading ddl to show the value of State column into Ad/product row as well if the user want to update the rest of state will be also reachable. It maybe hard to get what i am looking for exactly so i make a short screen record ...
Rebinding values of Ad/product depending on AdsID which is a query string in the page called: QADNUM
[URL] ....
if (!IsPostBack)
{
if (cookie["Location"] == null)
{
DataTable rEfilterstathpBizDT = new DataTable();
using (SqlConnection REGGfilterstathpBizCon = new SqlConnection(sc))
[Code] ......
iam insert record using datable in gridivew,iam using session to hold the record, there is any other way to hold the record in datable.
[Code]....
I have copied this shopping cart from the net and incorporated it into my SearchResult.aspx. I understand the code and it seems simple enough but for some reason I am getting an error when trying to run it. Can someone tell me what is wrong below? The generated error stop at the following point: For Each objDR In objDT.Rows. I was thinking that object was not creative during the page load. So I added an
If IsDBNull(objDT) Then
makeCart()
objDT = Session("Cart")
End If
to check if that object exist or not then try to create it. But that didn't work either. :(
This is the error message:
Object reference not set to an instance of an object.
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
This is the code to the page. It take the data from a select button on a gridview1. That doesn't seem to be the problem so I didn't added onto here for you guys to see.
[Code]....
I have a DropDownList on a main form that has a few values, one of which I want to store in the Session. I added the following code to the DropDownList_SelectedIndexChanged method:
Session.Add("CEEnvironment", EnvironmentDropDownList.SelectedValue);
I have a cascading dropdownlist. The first drop down is for Departments and is databound on PageLoad from the database. The user then selects a department and the second dropdown is populated with the appropriate sub departments via JQuery/JSON which calls an httphandler. The problem is as follows: I select a department and the subdepartments are filled.
I finish what I'm doing on that screen and everything is fine. But then if I go to a different screen and add an additional subdepartment then come back to original screen, the new sub department won't appear in the cascading dropdown. I have to close the browser and restart the session in order for any new sub departments to appear even though they are in the database. I put a breakpoint in the httphandler and noticed that it is only called once per session per each department in the first dropdown. I don't know why this is happening. I want it to call the httphander EVERY time the index of the department dropdown is changed.
[Code]...
I am storing Datatable in Session variable in my project. Is it good practise to do so? The datatable has 20 fields and can run into 1000+ records. Will it hamper my application performance?
View 11 RepliesI have a collection of objects that are display in google maps. This map is refresh (using Javascript, a call to the server using WebServices) every minute.
I need to display some of the information of these objects in a gridview control.
When I get the collection I store them in a session variable.
Can i use this variable (session) to bind to my gridview? I would like to avoid to go twice to the server, one to get the collection for display the map and other to get the collection for the gridview.
The sites I mantain are using way too much ViewState and I'd like to reduce that so the size of the page is reduced. I've done a lot to remedy this but I have an issue relating to DropDown lists that use AutoPostbacks.I have a dropdown list with a lot of list items and a good part of the ViewState usage is to hold the list item data. If I disable ViewState and set the AutoPostBack property to true, the page will post back and in the page load I am trying to repopulate the dropdown list with cached data. However, it seems that the SelectedIndexChanged event doesn't fire when EnableViewState="false".Is it possible to make this work without enabling ViewState for the drodown list?
View 6 Repliesi want to bind jqgrid with static data in asp.net without using webservice.
View 2 RepliesHow to bind "OnDataBound" event of "DropDownList" in declarative syntax to a static method in some other class ?e.g<asp:DropDownList runat="server" id="d1" OnDataBound="SomeOtherClassThanThisPage.StaticMethod"></asp:DropDownList>
This will give the error, "Page does not contain a definition for SomeOtherClassThanThisPage. it like this or it be done in the Code Behind only ?
I have developed a website in asp.net 2.0 with backend MS SQL server 2005. After each 2-3 days when i try to login to my admin panel i get a /server application error "datatable must be set prior to using dataview ".When I made a research on this i found the error is in the caching part of the code where i am using a dataset to fill my dropdown lists. But I am using the same code everywhere and on other place i didn't get any error but on a specific page. i usually get error when i try to login to admin. After successful login i redirect the admin to a page adminBazaar.aspx. and the error is always thrown by dis page only.other pages with the same code are working fine and there are no issues.I am using SqlCachingDependency. but can't figure out how to solve the problem.Right now to solve this I have to go to the server stop the website,then stop the application pool and the restart both. We have created a separate application pool for the website.
View 4 RepliesI have this code (just for example):
[Code]....
The Code-behind file looks like that:
[Code]....
So, when i use
[Code]....
SelectedIndexChanged event doesn't fire for the first item of the DropDownList. For any other item SelectedIndexChanged fires, but not for the first one.Could someone, please, explain what kind of magic is it?(I use Visual Studio 2008)
I have done a web appllication and when run simultaneously from different locations, the one that is started first would use the one that is started late's session variable and datatable contents. This is an exams web app and pageone.aspx results should never be used for pagetwo.aspx's results, because they are not the same questions.
What can I do to prevent this from happening. I am desperate, people are standing by to do exams and time is not on my side.