protected void Button1_Click(object sender, EventArgs e) { objBEL = new subjectFacultyDetailsBEL(); objDAL = new ClassDAL(); objBEL.course = DropDownList1.SelectedValue; objBEL.branch = DropDownList2.SelectedValue; objBEL.year = DropDownList3.SelectedValue; objBEL.subject = DropDownList5.SelectedValue; objBEL.teacher = DropDownList4.SelectedValue; Label3.Text = objDAL.AddsubjectFacultyDetails(objBEL); GridView1.DataBind(); }