How can I display a messagebox in ASP.NET?

Question

I want to show a message box on the successful save of any item. I googled it and tried different solutions, but none of them worked. Here is the code I am using:

Answer 1

This method works fine for me:

private void alert(string message)
{
    Response.Write("");
}

Example:

protected void Page_Load(object sender, EventArgs e)
{
    alert("Hello world!");
}

And when your page load yo will see something like this:

I'm using .NET Framework 4.5 in Firefox.