I cannot save

Question

Hi!

 

When I am trying to save I receive this message:

 Object reference not set to an instance of an object.

 

Please have a look to my whole code:

 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

//using System.Data;

using System.Data.SqlClient;

namespace ElSoft_FactuStocks

{

public partial class Facturacao : Form

{

public Facturacao()

{

InitializeComponent();

}

//DataRowView drv;

System.Data.SqlServerCe.SqlCeConnection con;

System.Data.SqlServerCe.SqlCeDataAdapter da;

System.Data.SqlServerCe.SqlCeCommandBuilder cb;

DataSet ds1;

int MaxRows = 0;

int inc = 0; 

 

private void btnSave_Facturacao_Click(object sender, EventArgs e)

{

DataRow dRow = ds1.Tables["facturacao"].NewRow();

dRow[1] = label10.Text;

/*dRow[1] = nomeClienteFactu.Text;

dRow[2] = artigoFactu.Text;

dRow[3] = leituraCodFactu.Text;

dRow[4] = quantidadeFactu.Text;

dRow[5] = precoFactu.Text;

dRow[6] = totalFactu.Text;*/

//dRow[7] = quantidadeFactu.Text;

//dRow[8] = quantidadeFactu.Text;

ds1.Tables["Facturacao"].Rows.Add(dRow);

System.Data.SqlServerCe.SqlCeCommandBuilder cb;

cb = new System.Data.SqlServerCe.SqlCeCommandBuilder(da);

cb.DataAdapter.Update(ds1.Tables["Facturacao"]);

MaxRows = MaxRows + 1;

inc = MaxRows - 1;

//btnAddNew.Enabled = true;

//btnSave.Enabled = false;

}