protected void Page_Load(object sender, EventArgs e) { try { this.Master.name.Text = Session["User"].ToString(); } catch (Exception ex) { Response.Redirect("index.aspx"); } int sid = Convert.ToInt32(Session["Feedback_Key"]); FeedbackDAL fdal = new FeedbackDAL(); DataSet ds = fdal.GetAll(sid); if (ds.Tables[0].Rows.Count > 0) { DataTable dt = ds.Tables[0]; DataRow dr = dt.Rows[0]; string a = Session["Feedback_Key"].ToString(); string b = dr["student_id"].ToString(); if (a == b) { pnlFeedback.Visible = false; lblSubmitted.Text = "Feedback Already Submitted"; } } }