SQL行未删除

Question

So I have this code that is designed to delete a row in mySQL server database judging by what is selected in my list box. Here is the code I have to remove the rows:

private void remove_btn_Click(object sender, EventArgs e)
    {
        try
        {
            if (Calls_lsb.SelectedItem == null)

                MessageBox.Show("Please select an item for deletion.");
            }
            else
            {
                int i = Calls_lsb.SelectedIndex;
                if (i > 0)
                {
                    SqlConnection connection = new SqlConnection(//My Connection String);
                    string sqlStatement1 = "DELETE FROM Records WHERE CallID = @Id";
                    string sqlStatement2 = "DELETE FROM Calls WHERE CallID = @Id";

                    connection.Open();
                    SqlCommand cmd1 = new SqlCommand(sqlStatement1, connection);
                    cmd1.Parameters.AddWithValue("@Id", Calls_lsb.Items[i]);
                    cmd1.ExecuteNonQuery();
                    SqlCommand cmd2 = new SqlCommand(sqlStatement2, connection);
                    cmd2.Parameters.AddWithValue("@Id", Calls_lsb.Items[i]);
                    cmd2.ExecuteNonQuery();
                    connection.Close();

                    Calls_lsb.Items.Remove(Calls_lsb.Items[i]);
                }
                else
                {
                }
            }
        }
        catch (Exception ex)
        {

            MessageBox.Show(ex.ToString());
        }
    }

I get no exceptions and I have similar code that adds records that works fine. I tried stepping into the code but it all seemed fine. It simply just does not delete the row from the database. It removes the correct item from the list, just not the database.

If anyone could shine some light on this situation that would be great, thanks!

Edit : Ok, I seem to have fixed the problem. I just removed the whole i = selected index stuff and replace the 'Calls_lsb.Items[i]' with '(Calls_lsb.SelectedIndex + 1)'. I don't really understand why I was getting an exception when I tried to add 1 to i as this is basically doing the same thing.

Answer 1

Replace your below line code.

  cmd1.Parameters.AddWithValue("@Id", Calls_lsb.Items[i]);
  //with 
  cmd1.Parameters.AddWithValue("@Id", Calls_lsb.Items[i].Value);

and

  cmd2.Parameters.AddWithValue("@Id", Calls_lsb.Items[i]);

// with

  cmd2.Parameters.AddWithValue("@Id", Calls_lsb.Items[i].Value);