protected void Login_Click(object sender, EventArgs e) { da = new DA.DA(); string username = txtUsername.Value; string Login = da.CheckUSer(username, txtPassword.Value); if (Login == "1") { // 1 = Teacher Session["username"] = username; lblError.InnerHtml = ""; Response.Redirect("ClassView.aspx"); } else if (Login == "2") { // 2 = Student Session["username"] = username; lblError.InnerHtml = ""; Response.Redirect("StudentPage.aspx"); } else if (Login == "3") { // 3 = Admin Session["username"] = username; lblError.InnerHtml = ""; Response.Redirect("AdminPage.aspx"); } else { lblError.InnerHtml = Login; Session["username"] = null; } }