How to show MessageBox on asp.net?

Question

if I need to show a MessageBox on my ASP.NET WebForm, how to do it?

I try: Messagebox.show(\"dd\");

But it\'s not working.

Answer 1

I took the code from the brilliant @KrisVanDerMast and made it wrapped up in a static method that can be called as many times as you want on the same page!

/// 

/// Shows a basic MessageBox on the passed in page
/// 
/// The Page object to show the message on
/// The message to show
/// 
public static ShowMessageBox(Page page, string message)
{
    Type cstype = page.GetType();

    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = page.ClientScript;

    // Find the first unregistered script number
    int ScriptNumber = 0;
    bool ScriptRegistered = false;
    do
    {
        ScriptNumber++;
        ScriptRegistered = cs.IsStartupScriptRegistered(cstype, "PopupScript" + ScriptNumber);
    } while (ScriptRegistered == true);

    //Execute the new script number that we found
    cs.RegisterStartupScript(cstype, "PopupScript" + ScriptNumber, "alert('" + message + "');", true);
}