บันทึกข้อมูลจาก gridview โดยใช้ checkbox ลงใน ตารางใหม่ของ Database ไม่ได้ครับ Error ดังภาพ

protected void Button1_Click(object sender, EventArgs e)
        {
             foreach (GridViewRow row in GridView1.Rows)

              if (lblUserApprove.Text == "thipsuda Online")
            {
                CheckBox chkCusID;
                Label lblDD;
                int i;
                lbd.Text = "";

                for (i = 0; i <= GridView1.Rows.Count - 1; i++)
                {
                    chkCusID = (CheckBox)GridView1.Rows[i].FindControl("chkCustomerID");
                    lblDD = (Label)GridView1.Rows[i].FindControl("lblEmployeeID_1");
                    if (chkCusID.Checked)
                    {                                                     
                            
                        SqlCommand cmd = new SqlCommand();
                        cmd.CommandText = "insert into Approve_LD (EmployeeID) Values (@EmployeeID)";

                        cmd.Parameters.AddWithValue("@EmployeeID", Convert.ToString(lblDD.Text));

                            if (con.State != ConnectionState.Open)
                                con.Open();
                            cmd.Connection = con;
                            cmd.ExecuteNonQuery();
                            con.Close();

                        }
                    }

protected void Button1_Click(object sender, EventArgs e)
        {
             //foreach (GridViewRow item in GridView1.Rows)

                //if (lblUserApprove.Text == "thipsuda Online")
            {
                CheckBox chkCusID;
                Label lblDD;
                int i;
                lbd.Text = "";

                for (i = 0; i <= GridView1.Rows.Count - 1; i++)
                {
                    chkCusID = (CheckBox)GridView1.Rows[i].FindControl("chkCustomerID");
                    lblDD = (Label)GridView1.Rows[i].FindControl("lblEmployeeID_1");
                    if (chkCusID.Checked)
                    {                                                     
                            
                        SqlCommand cmd = new SqlCommand();
                        cmd.CommandText = "insert into Approve_LD (EmployeeID) Values (@EmployeeID)";
                      
                        cmd.Parameters.AddWithValue("@EmployeeID", (lblDD.Text));

                            if (con.State != ConnectionState.Open)
                            con.Open();
                            cmd.Connection = con;
                            cmd.ExecuteNonQuery();
                            con.Close();

                        }
                    }

 protected void Button1_Click(object sender, EventArgs e)
        {
             //foreach (GridViewRow item in GridView1.Rows)

                //if (lblUserApprove.Text == "thipsuda Online")
            {
                CheckBox chkCusID;
                Label lblDD;
                int i;
                lbd.Text = "";

                for (i = 0; i <= GridView1.Rows.Count - 1; i++)
                {
                    chkCusID = (CheckBox)GridView1.Rows[i].FindControl("chkCustomerID");
                    lblDD = (Label)GridView1.Rows[i].FindControl("lblEmployeeID_1");
                    if (chkCusID.Checked)
                    {                                                     
                            
                        SqlCommand cmd = new SqlCommand();
                        cmd.CommandText = "insert into Approve_LD (EmployeeID) Values (@EmployeeID)";
                      
                        cmd.Parameters.AddWithValue("@EmployeeID", (lblDD.Text));
                                                
                           if (con.State != ConnectionState.Open)
                            con.Open();
                            cmd.Connection = con;
                            cmd.ExecuteNonQuery();
                            con.Close();



                        if (con.State != ConnectionState.Open)
                            con.Open();
                        cmd.CommandText = "Delete From Detail Where EmployeeID=@EmployeeID";
                        cmd.Connection = con;
                        cmd.ExecuteNonQuery();
                        con.Close();
                        
                    }
                 }