Object reference not set to an instance of an object.

Question

Hi!

When I click on my save button I receive this message. But sound that everything it's right? Why this message? "Object reference not set to an instance of an object."


These my codes:

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.SqlClient;

using System.Data.OleDb;

namespace LunaOffice

{

    public partial class VisualRecursosHumanos : Form

    {

OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\lunaoffice\lunaoffice\app_data\office.accdb;");

        

        public VisualRecursosHumanos()

        {

            InitializeComponent();

        }

        OleDbConnection con;

        DataSet ds1;

        OleDbDataAdapter da;

        int MaxRows = 0;

        int inc = 0;

private void Save_Click(object sender, EventArgs e)

        {

            //////////////////////////

            System.Data.OleDb.OleDbCommandBuilder cb;

            cb = new System.Data.OleDb.OleDbCommandBuilder(da);

            DataRow drow = ds1.Tables["funcionario"].NewRow();// The bug it's here

            drow[0] = txtNomesCadastFunc.Text;

       

            ds1.Tables["funcionario"].Rows.Add(drow);

            MaxRows = MaxRows + 1;

            inc = MaxRows - 1;

con.Open();

        da.Update(ds1, "funcionario");

con.Close();

            MessageBox.Show("Record / Entry Added");

        }

        private void VisualRecursosHumanos_Load(object sender, EventArgs e)

        {

        

            //con = new.OleDbConnection();

            

            ds1 = new DataSet();

            con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:/lunaoffice/lunaoffice/app_data/office.accdb";

            string sql = "SELECT * from funcionario";

            da = new OleDbDataAdapter(sql, con);

            con.Open();

            da.Fill(ds1, "funcionario");

            //NavigateRecords();

            MaxRows = ds1.Tables["funcionario"].Rows.Count;

            

            con.Close();

            con.Dispose();

        }

        }