Expert: Srini Nagarajan - 8/14/2007

Question
Hey,

I hav an application which uses a checkboxlist with 6 checkboxes. I would like to make sure at least one of the checkboxes is checked. I have tried many versions of validation but cannot get this to work. Can you shed any light on what to do?

Cheers

Paul

Answer
Hi,

You can use Custom validation to check CheckboxList

Here is the sample code.

  
   private void User_Choice(object sender, ServerValidateEventArgs e)
   {
       int counter = 0;
   
       for(int i=0;i<chkboxPeeps.Items.Count;i++)
       {
           if(chkboxPeeps.Items[i].Selected)
           {
               counter++;
           }
   
           e.IsValid = (counter == 0) ? false : true;
       }
   }
   
   public void ValidateForm(object sender, EventArgs e)
   {
       if(Page.IsValid)
       {
           //success
       }
       else
       {
           failed validation msg
       }
   }


<asp:CheckBoxList id="chkboxPeeps"  runat="server"/>
<asp:CustomValidator id="customvalidation" runat="server" display="dynamic" text="You need to select at least one of the choices to be valid" OnServerValidate="User_Choice"/>           
<asp:Button id="btnSubmit" Text="Check" OnClick="ValidateForm" runat="server"/>

Hope this helps!!

-Srini