private void btAdd_Click(object sender, System.EventArgs e)
{
   DataTable dt = dataSet1.Tables["Users"];
   
   try
   {
	DataRow row = dt.NewRow();
	row["Name"] =  this.textBox1.Text;
	row["FAM"] =   this.textBox2.Text;
	row["Otchestvo"] =    this.textBox3.Text;
	dt.Rows.Add(row);
    }
    catch(Exception ex)
    {
	MessageBox.Show(ex.Message);
    }
}

          public void Save ()
          {
	 DataSet ds = dataSet1.GetChanges();
	 if(ds != null)
	 {
	       oleDbDataAdapter1.Update(dataSet1);
	       dataSet1.AcceptChanges();
	  }
	else
	{
                    MessageBox.Show("Not changes!!! Not save!!!");
	}
}