Datagrid default value - .NET FRAMEWORK C# WINFORM

Question

I'm trying to insert a default value using a datagrid whit binding navigator.
If I insert a new record from cliccking the asterisk in the left/bottom of the form "DefaultValuesNeeded" works fine .
If I insert a new record cliccking the plus, using this code, it's insert a good row and a null row using the trigger in the "bindingNavigatorAddNewItem_Click".
Where is the problem ?
Thanks a lot.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GRIDDEFAULT
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

    private void rUBRICABindingNavigatorSaveItem_Click(object sender, EventArgs e)
    {
        this.Validate();
        this.rUBRICABindingSource.EndEdit();
        this.tableAdapterManager.UpdateAll(this.dMCODataSet);

    }

    private void Form1_Load(object sender, EventArgs e)
    {
        // TODO: questa riga di codice carica i dati nella tabella 'dMCODataSet.RUBRICA'. È possibile spostarla o rimuoverla se necessario.
        this.rUBRICATableAdapter.Fill(this.dMCODataSet.RUBRICA);

    }

    private void bindingNavigatorAddNewItem_Click(object sender, EventArgs e)
    {
        // BindingNavigator button's AddNewItem automatic tie-in to bindingSource's AddNew() is removed
        // This sets the current cell to the NewRow's cell to trigger DefaultValuesNeeded event
        rUBRICADataGridView.CurrentCell = rUBRICADataGridView.Rows[rUBRICADataGridView.NewRowIndex].Cells[0];
    }

    private void rUBRICADataGridView_DefaultValuesNeeded(object sender, DataGridViewRowEventArgs e)
    {
        // Gets called when datagridview's */NewRow is entered.
        e.Row.Cells[0].Value = 1;
        e.Row.Cells[1].Value = "nome";
        e.Row.Cells[2].Value = "cognome";
    }
}

}

Answer 1

I'm trying even with this code but the "plus button" generate a first row NULL and the second row correct.

private void bindingNavigatorAddNewItem_Click(object sender, EventArgs e)
{

        this.dMCODataSet.RUBRICA.Columns[00].DefaultValue = 1;
        this.dMCODataSet.RUBRICA.Columns[01].DefaultValue = "nome";
        this.dMCODataSet.RUBRICA.Columns[02].DefaultValue = "cognome";

    }

Answer 2

For the BindingNavigator add record there are default code that does not pay attention to default value needed. To fix this change the default action to none

Then double click the add button and write your code to add.

private void bindingNavigatorAddNewItem_Click(object sender, EventArgs e)  
{  
    // TODO  
}