button enable problem

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ASP.NET

on page load using javascript i disable the button .

that is

protected void Page_Load(object sender, EventArgs e){
{
  btnExcel.Attributes.Add("onclick", " this.disabled = true; " + ClientScript.GetPostBackEventReference(btnExcel, null) + ";");

}

now i want is to enable the button control

protected void btnExcel_Click(object sender, EventArgs e)
{
1.  Rpt.ExportToHttpResponse(ExportFormatType.Excel, Response, true, "Project Summary Report");

2.  btnexcel.enable=true;
}

after executing 1 statment

why control doesnot execute 2 statement in asp.net 2.0

if 2 statement not executed then my button control not enable.


if i put this statement

Rpt.ExportToHttpResponse(ExportFormatType.Excel, Response, true, "Summary Report");

in try block then in catch block get msg Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

if comment this statement Rpt.ExportToHttpResponse(ExportFormatType.Excel, Response, true, "Summary Report");

then btnexcel.enable=true; statement executed.

so how can i solve this issue.