MySQL / C＃插入问题

Question

Not sure what is wrong with this

//Setup MySQL
    private MySqlConnection datconnection = new MySqlConnection();
    //private MySqlDataAdapter datdata = new MySqlDataAdapter();
    DataGrid datgridInfo = new DataGrid();
    int connect;
    private Form_NewEnquiry frm_parent;

    public Form_AddVenue(Form_NewEnquiry frm1)
    {
        InitializeComponent();
        frm_parent = frm1;
    }

    private void btnAdd_Click(object sender, EventArgs e)
    {
        connect = 0;
        try
        {
                datconnection.ConnectionString =
                "server=127.0.0.1;"
                + "database=as;"
                + "uid=a;"
                + "password=a;";
                connect = 1;
        }
        catch (Exception)
        {
            MessageBox.Show("Connection Unavailable");
        }


        //INSERT SQL Code to Insert Venue
        if (connect == 1)
        {
            try
            {
                datconnection.Open();
                MySqlCommand command = new MySqlCommand("INSERT INTO venues (venue_name,venue_address1,venue_address2,venue_town,venue_county,venue_postcode,venue_telephone,venue_fax,venue_email,venue_web,venue_maxguests) VALUES (?,?,?,?,?,?,?,?,?,?,?)", datconnection);
                command.Parameters.Add("name", MySqlDbType.VarChar, 45, tbName.Text.ToString());
                command.Parameters.Add("address1", MySqlDbType.VarChar, 45, tbAddress1.Text.ToString());
                command.Parameters.Add("address2", MySqlDbType.VarChar, 45, tbAddress2.Text.ToString());
                command.Parameters.Add("town", MySqlDbType.VarChar, 45, tbTown.Text.ToString());
                command.Parameters.Add("county", MySqlDbType.VarChar, 45, tbCounty.Text.ToString());
                command.Parameters.Add("postcode", MySqlDbType.VarChar, 10, tbPostcode.Text.ToString());
                command.Parameters.Add("telephone", MySqlDbType.VarChar, 15, tbTelephone.Text.ToString());
                command.Parameters.Add("fax", MySqlDbType.VarChar, 15, tbFax.Text.ToString());
                command.Parameters.Add("email", MySqlDbType.VarChar, 255, tbEmail.Text.ToString());
                command.Parameters.Add("web", MySqlDbType.VarChar, 255, tbWeb.Text.ToString());
                command.Parameters.Add("maxguests", MySqlDbType.Int32, 11, nudNoOfGuests.Value.ToString());
                command.ExecuteNonQuery();
                //datdata.InsertCommand = command;
            }
            catch (Exception eea)
            {
                MessageBox.Show("Error storing data");
                MessageBox.Show(eea.ToString());
                connect = 0;
            }
            finally
            {
                datconnection.Close();
            }
        }
        if (connect == 1)
        {
            MessageBox.Show("Data Saved");

            //Print

            //Close Window
            frm_parent.reloadVenue();
            this.Close();
        }
    }

This gives me the error System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

Answer 1

Seems like the size of some of the data is more than the size of the parameter you have specified. for example

command.Parameters.Add("name", MySqlDbType.VarChar, 45, tbName.Text);

is the size of the tbName.Text string less than 45. what about using

command.Parameters.Add("name", MySqlDbType.VarChar, tbName.Text.Length, tbName.Text);

Answer 2

You don't need the ToString() on the Text property it already is a string please avoid it.

Also

command.Parameters.Add("maxguests", MySqlDbType.Int32, 11, nudNoOfGuests.Value.ToString())

This is expecting a int parameter and you are passing in a string, please use Convert.ToInt32 to pass in the value.

Normally these errors occur due to difference in the number of parameters declared and passed to the command but seems fine in your case. What type of control is nudNoOfGuests maybe that is causing the format error