Show a "messagebox" on button click via server side code in visual webpart

Hi,

i have a curious problem. I have a already developed Visual WebPart and a Button on it. This Button has an Server Side OnClick Event which works fine. I need to add new functionality to it so that after the action in the onClick Event is finished, i need to show a messagebox (Javascript alert).

I tried everything what i also used in the past for example in Custom Application Pages but none of the code snippets worked. I also have googled around but had no luck.

This is my .ascx code for the Button

<asp:Button ID="btnGo" CssClass="ms-ButtonHeightWidth" Text="Apply" runat="server" OnClick="BtnAppyClick"/>

This is my onClick Event for the Button

    protected void BtnAppyClick(object sender, EventArgs e)
    {
        try
        {
            // Page.Response.Write("<script language='JavaScript'>alert('The 60 seconds.')</script>");

            //string script = "<script language='javascript'>alert('The 60 seconds.')</script>";
            //Page.ClientScript.RegisterClientScriptBlock(GetType(), "alert_box", script);

            //ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert_box", "alert('The 60 seconds.')", true);

            ClientScriptManager csm = Page.ClientScript;
            csm.RegisterClientScriptBlock(this.GetType(), "alert_box", "<script type=\"text/javascript\" language=\"javascript\">alert('The 60 seconds.');</script>", true);            }
        catch (Exception se)
        {
            lbError.Text = BuildErrorMsg(se);
        }
    }

This is the proof that my onClick event works fine. As you can see from my code, i tried several ways to show the alert message, but without success.

I simply want to show a Javascript alert box on Button click from server side code, but this doesnt work. When i debug my solution the event is getting executed and there is no error.

What is wrong here? I think the problem must be theVisual WebPart! But i have no idea how to get it working.

Best regards,
Yavuz B.

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