Thank you for the suggestion. I agree, your approach looks easier to read.

>You should probably use string.Format() to this sort of thing:
>
>

>string clientId = "someId";
>
>string script = @"
><script>
>function DisableButton() {
>   document.getElementById('{0}').disabled = true;
>}
></script>
>";
>
>script = string.Format(script,clientId);
>

>
>Much easier to write, read and work with. Note that @"" strings have to escape double quotes (") with two double quotes ("").
>
>+++ Rick ---
>
>>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; }");
>>