Trouble with viewstate in usercontrols with 6.2

Posted by Community Admin on 04-Aug-2018 06:23

Trouble with viewstate in usercontrols with 6.2

Sitefinity - Bugs & Issues

All Replies

Posted by Community Admin on 22-Nov-2013 00:00

I am working on building a custom widget and am unable to track viewstate properly. I have tried this in a custom user control and a widget created with Thunder. I originally noticed the issue when trying to use the RadGrid and I was unable to get any sorting or paging to work correctly when using the needdatasource event. I then created the user control below to test viewstate. What I found was that when I put a value in the text box it would populate the viewstate property and the value would be written to my label but if I posted back the page again the value in the viewstate property would be cleared. I did make sure that viewstate was enabled in the properties of the sitefinity page that I loaded the widget onto and also turned off cache just for testing. Please let me know what I need to do in order to get viewstate working.

CS File

01.using System;
02.using System.Collections.Generic;
03.using System.Linq;
04.using System.Web;
05.using System.Web.UI;
06.using System.Web.UI.WebControls;
07. 
08.namespace SitefinityWebApp.Controls
09.
10.    public partial class Test : System.Web.UI.UserControl
11.    
12.        protected void Page_Load(object sender, EventArgs e)
13.        
14.            theVal.Text = MyVal;
15.        
16. 
17.        protected string MyVal
18.        
19.            get
20.            
21.                if (ViewState["MyVal"] == null)
22.                    ViewState["MyVal"] = "Viewstate null";
23.                return (string)ViewState["MyVal"];
24.            
25.            set
26.            
27.                ViewState["MyVal"] = value;
28.            
29.        
30. 
31.        protected void update_Click(object sender, EventArgs e)
32.        
33.            MyVal = newVal.Text;
34.            theVal.Text = MyVal;
35.        
36.    
37.

Ascx file

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Test.ascx.cs" Inherits="SitefinityWebApp.Controls.Test" %>
<asp:Label ID="theVal" runat="server" Text="Wasn't Set" />
<br />
<asp:TextBox ID="newVal" runat="server"  />
<br />
<asp:Button ID="update" runat="server" Text="Update" OnClick="update_Click" />
<br />
<asp:Button ID="post" runat="server" Text="Post" />

Posted by Community Admin on 22-Nov-2013 00:00

Hi David,

We answered to your ticket regarding the same issue. If you find the solution useful you can share it with the community.

Regards,
Strahil Strahilov
Telerik

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Posted by Community Admin on 07-Jan-2014 00:00

After a bit of troubleshooting we eventually discovered that viewstate does not work in preview mode which is where i was working from. After publishing the page and view the live version everything works. Apparently this is by design. 

This thread is closed