how to raise an event on image click in datalist

Question

5.00/5 (1 vote)

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On page load I get some images in datalist through sql table. I tried with the following code but get error like:
'Invalid postback or callback argument. Event validation is enabled using <pages enableeventvalidation="true"> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.'

XML

<asp:DataList ID="DataList1" runat="server"  OnItemCommand="Item_Command"  width="220" BorderStyle="None"    BorderWidth="2" RepeatColumns="2"    >
   <table id="Table3"  style=" margin-top:-33px" visible ="true">
   <tr>
   <td>
   <p >
  <asp:ImageButton ID="ImageButton1"  runat="server" CommandName="imgClick"  ImageUrl='<%#DataBinder.Eval(Container.DataItem,"PicturePath") %>' />
  <%--<img src= '<%#DataBinder.Eval(Container.DataItem,"PicturePath") %>' --%>
   <br /><br />

C#

public void Item_Command(Object sender, DataListCommandEventArgs e)

   {
       if (e.CommandName == "imgClick") // check commandname here
       {
       }
   }

Posted 12-Dec-13 21:51pm

S.Rajendran from Coimbatore

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Comments

creepz03 13-Dec-13 3:53am

Does directly calling the onclick event of ImageButton does not work?

Karthik_Mahalingam 13-Dec-13 5:02am

post your page directive tag

4 solutions

Solution 1

you can use model and modelless dialogue box

or

double click on imagebutton and whatever event generate just see there click event copy and paste in your condition

or

you can use parameter for this solution

Posted 12-Dec-13 21:56pm

Gaurav Makwana

Solution 2

visit here...

http://forums.asp.net/t/1306207.aspx[^]

Posted 12-Dec-13 22:03pm

Rakesh Meel

Solution 4

VB

like:
'Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page

for this erroe use on page load

CSS

if(!ispostback)
{
//bind ur datalist here
}

and for click event write this code in aspimage button

HTML

onClick="ImageButton1_Click"

and at code behind

C#

protected void ImageButton1_Click(object sender , Eventargs e)
{
}

Posted 12-Dec-13 22:29pm

Omprakash Kukana

Comments

S.Rajendran from Coimbatore 13-Dec-13 4:35am

Fine.Thank you.

Omprakash Kukana 13-Dec-13 4:40am

your welcom if it helps u you can mark it as answer

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JoCodes · Accepted Answer · 2013-12-12T22:14:00

Solution 3

Check Datalist Databinding with

If(!IsPostBack)

This cause the postback event raised by a certain Image in the Datalist wont be in sync
since the Datalist control/item collection is regenerated through databinding.
Then the postback caused will be by an unknown source and throw the "EventValidation" Exception.

Posted 12-Dec-13 22:14pm

JoCodes

Comments

S.Rajendran from Coimbatore 13-Dec-13 4:33am

Well. I put the datalist binding under 'if(!IsPostBack)'. It works. Thank you.

JoCodes 13-Dec-13 4:46am

Welcome Rajendran. Glad to hear your problem got solved.