ASP.NET Create Javascript Alert on Server Side

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Many times in ASP.net you find yourself needing to create an alert on the client side but you're processing on the server side. The trick is to register a Javascript to the client from the server. I have found a nifty way of creating a class that will allow you to do this. 

public static class ClientMessageBox
{

    public static void Show(string message, Control owner)
    {
        Page page = (owner as Page) ?? owner.Page;

        if (page == null)
        {
          return;
        }

        page.ClientScript.RegisterStartupScript(owner.GetType(),
            "ShowMessage", string.Format("<script type="text/javascript">;alert('{0}')</script>",
            message));

    }

}

// Example of using class and method
protected void Page_Load(object sender, EventArgs e)
{
    ClientMessageBox.Show("Hello World", this);
}

You can now call ClientMessageBox.Show('text', this ); anywhere server side and get a nice javascript alert. Now of course there are AJAX control toolkits and other things that do this for you but this is a bare bones pure C# solution.

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