protected void ddlSubjects_OnSelectedIndexChanged(object sender, EventArgs e)
{
if (ddlSubjects.SelectedIndex == 0)
{
Response.Redirect(DotNetNuke.Common.Globals.NavigateURL());
}
// Else
var tc = new ClassController();
int x = int.Parse(ddlSubjects.SelectedValue);
rptSubjectList.DataSource = tc.GetClassesBySubId(x); // Get subjects based on subjectId
rptSubjectList.DataBind();
}