Call the jQuery code from the following code

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1

Continuing the discussion from Call Jquery Code From Code Behind:
Why can’t I do it in the submit button

    String csname1 = "PopupScript2";
    Type cstype = this.GetType();
        
    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Check to see if the startup script is already registered.
    if (!cs.IsStartupScriptRegistered(cstype, csname1))
    {
        StringBuilder cstext1 = new StringBuilder();
        cstext1.Append("<script type=text/javascript> alert('JS injected on custom button click event') </");
        cstext1.Append("script>");

        cs.RegisterStartupScript(cstype, csname1, cstext1.ToString());
    }