捕捉到错误后怎么不出提示

捕捉到错误后怎么不出提示?

catch (Exception ex)
{
Response.Write( " <script defer> window.alert( '导入失败! " + ex + " '); </script> ");
return;
}

------解决方法--------------------------------------------------------
catch (Exception ex)
{
Response.Write( " <script> window.alert( '导入失败! " + ex.Message + " '); </script> ");
}

------解决方法--------------------------------------------------------
string err = string.Format( " <script> alert( '{0} '); </script> ",ex.Message)//ex.Message可能需要处理 ' "字符。

response.Write(err);