Prevent double clicking asp.net button

Prevent Double Click .Please add below code in your aspx page.

<script type="text/javascript" language="javascript">

   Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
   function BeginRequestHandler(sender, args) { var oControl = args.get_postBackElement(); oControl.disabled = true; }

</script>

You can prevent double-clicking using this code:

Me.btnSave.Attributes.Add("onclick", "this.disabled=true;")
Me.btnSave.UseSubmitBehavior = False

So you can use btnSave_Click to call your API.

Usually I have a lot of Validators in my Page: setting Validator.SetFocusOnError = True I can run this code to reenable save button if a validation failed.

Me.YourControl.Attributes.Add("onfocus", Me.btnSave.ClientID & ".removeAttribute('disabled');")

This solution is simple and effective. On your button include this code:

OnClientClick="return CheckDouble();"

And wherever you want your JavaScript - e.g. At the bottom of your page:

<script type="text/javascript">
   var submit = 0;
   function CheckDouble() {
     if (++submit > 1) {
     alert('This sometimes takes a few seconds - please be patient.');
     return false;
   }
 }
 </script>

Most of the above suggestions failed to work for me. The one that did work was the following by tezzo:

Me.btnSave.Attributes.Add("onclick", "this.disabled=true;")
Me.btnSave.UseSubmitBehavior = False

Simpler still, rather than using the above in the code-behind, just use the following:

   <asp:Button ID="btnSave" runat="server" Text="Save" 
      UseSubmitBehavior="false"
      OnClientClick="this.disabled='true';" 
   </asp:button>

UseSubmitBehavior="false" is the key.