Hi,

I am trying to build in the code behind of an ASP.NET page the following Javascript function:

<script type = "text/javascript">
            function DisableButton() {

                document.getElementById("< %Submit.ClientID %>").disabled = true;

              }

              window.onbeforeunload = DisableButton;
</script>

I want to "translate" this code into the Client Script built in code behind. But I get error on the

                    String csname2 = "ButtonClickScript";
                    Type cstype = this.GetType();

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

                    StringBuilder cstext2 = new StringBuilder();

                    cstext2.Append("<script type=\"text/javascript\"> function DisableButton() {");
                    cstext2.Append("document.getElementById("< %=Submit.ClientID %>").disabled = true};";
                    cstext2.Append("window.onbeforeunload = DisableButton;");
                    cstext2.Append("</script>");

But I get syntax error on the line
document.GetElementByID... that "missing semicolon".
Could you see how to write this line? Please keep in mind that the actual code has Percent sign (%) instead of work Percent.

UPDATE:
Solution:

cstext2.Append("document.getElementById('" + Submit.ClientID + "').disabled = true; }");