how to display a message before redirect.

you can also do it by creating the javascript function and calling it in your cs code like this:

JavaScript function:

function ShowMessage()
{
      alert('your message');
      window.location.href='default.aspx';
}

CSharp code:

ScriptManager.RegisterStartupScript(this, this.GetType(), "key", "ShowMessage()", true);

hope it helps :)

when you need to redirect your page you replace your Response.redirect is following code:-

RegisterStartupScript("save", "<script type=\"text/javascript\"> alert('Save successfully');  window.location.href = "your url"; </script>");

in above code is execute and display message and go to another page.
I hope solve your problem.

On the page you are working on, do the following:

1. Add a separate page to your application named popup.aspx.
2. Put an iframe with 0 width and height on your current page.
3. Set the src of your iframe to popup.aspx on the event you are working on.
4. Create a JavaScript function for alert message on your popup.aspx page and call it on page's onload.
5. After setting the src of your iframe in Step 3, you next put the location.href="/KB/answers/default.aspx".