public void add() { DataTable dt = new DataTable(); DataColumn dc1 = new DataColumn("Vacancy Id"); dt.Columns.Add(dc1); DataColumn dc2 = new DataColumn("Number of Positions"); dt.Columns.Add(dc2); DataColumn dc3 = new DataColumn("Required Date"); dt.Columns.Add(dc3); DataColumn dc4 = new DataColumn("Skills"); dt.Columns.Add(dc4); DataColumn dc = new DataColumn("Domain"); dt.Columns.Add(dc); DataColumn dc6 = new DataColumn("Experience"); dt.Columns.Add(dc6); DataColumn dc7 = new DataColumn("Loctaion"); dt.Columns.Add(dc7); DataColumn dc8 = new DataColumn("Status"); dt.Columns.Add(dc8); List <IVacancy> vacancyList = vacancyManager.SelectVacancy((int)Session["empid"]); if (vacancyList.Count != 0) { Error.Visible = false; foreach (IVacancy vacancy in vacancyList) { DataRow dr = dt.NewRow(); dr["Vacancy Id"] = vacancy.VacancyID; dr["Number of Positions"] = vacancy.NoOfPositions; dr["Required Date"] = vacancy.RequiredDate; dr["Skills"] = vacancy.Skills; dr["Domain"] = vacancy.Domain; dr["Experience"] = vacancy.Experience; dr["Loctaion"] = vacancy.Location; dr["Status"] = vacancy.Status; dt.Rows.Add(dr); } GridView1.DataSource = dt; GridView1.DataBind(); } else { Error.Visible = true; } }