数据网格视图没有受影响的行

Question

我希望在受影响的行=＆lt;时填充datagridview 0但我在第47行中得到错误gridview（id）=＆＃34; correctgridview＆＃34; runat =＆＃34; server＆＃34; 第一种情况很好但数据网格视图中的错误

mycode的

public partial class _Default : System.Web.UI.Page
        {
            protected void Page_Load(object sender, EventArgs e)
            {

            }
            protected void insertButton_Click(object sender, EventArgs e)
            {
                int rowsaffected = 0;
                dataset ds = new dataset(); 
                SqlConnection cn = new SqlConnection(@"Server=.\SQLEXPRESS; DataBase=attend; Integrated Security=true;");
                SqlCommand cmd;
                cn.Open();
                cmd = new SqlCommand("atten", cn);
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                cmd.CommandType = System.Data.CommandType.StoredProcedure;
                SqlParameter param = new SqlParameter();
                param.ParameterName = "@myid";
                param.Value = idTextBox.Text;
                cmd.Parameters.Add(param);
                rowsaffected = cmd.ExecuteNonQuery();
                if (rowsaffected > 0)
                {
                    resultLabel.Text = "added successful";
                }
                else
                {
                    resultLabel.Text = "attend error";
                    SqlCommand command;
                    command = new SqlCommand("select id, courses.course , course_date , st_lec , location from courses inner join regestration on courses.course = regestration.course where id = 2", cn);
                    SqlDataAdapter adapte = new SqlDataAdapter(command);
                    DataTable Dt = new DataTable();
                    adapte.Fill(Dt);
                    correctGridView.DataSource = Dt;
                    correctGridView.DataBind();

                }

                cn.Close();
               }

            }