string examName = string.Empty;
string courseId = string.Empty;
string subjectId = string.Empty;
if (!String.IsNullOrEmpty(Request.QueryString["ExamName"]))
{
examName = Convert.ToString(Request.QueryString["ExamName"]);
}
if (!String.IsNullOrEmpty(Request.QueryString["CourseId"]))
{
courseId = Convert.ToString(Request.QueryString["CourseId"]);
}
if (!String.IsNullOrEmpty(Request.QueryString["SubjectId"]))
{
subjectId = Convert.ToString(Request.QueryString["SubjectId"]);
}