public partial class Form2 : Form
  {
    public int InventoryId = 0;
    private DataRow CurrentRow;

    public Form2()
    {
      InitializeComponent();
    }

    private void SaveItem_Click()
    {
      this.Validate();
      this.inventoryBindingSource.EndEdit();
      this.tableAdapterManager.UpdateAll(this.garysInventoryDataSet);
    }

    private void Form2_Load(object sender, EventArgs e)
    {
      this.inventoryTableAdapter.Fill(this.garysInventoryDataSet.Inventory);

      CurrentRow = (from x in garysInventoryDataSet.Inventory
        where x.InventoryId == InventoryId
        select x).FirstOrDefault();

      if (CurrentRow == null)
      {
        MessageBox.Show("Inventory Item Not Found.");
      }

      yearToDateQuantityTextBox.Text = CurrentRow["YearToDateQuantity"].ToString();
    }

    private void button3_Click(object sender, EventArgs e)
    {
      CurrentRow["YearToDateQuantity"] = Convert.ToInt32(CurrentRow["YearToDateQuantity"]) + 1;
      yearToDateQuantityTextBox.Text = CurrentRow["YearToDateQuantity"].ToString();
    }

    private void button2_Click(object sender, EventArgs e)
    {
      CurrentRow["YearToDateQuantity"] = Convert.ToInt32(CurrentRow["YearToDateQuantity"]) - 1;
      yearToDateQuantityTextBox.Text = CurrentRow["YearToDateQuantity"].ToString();
    }

    private void Form2_FormClosing(object sender, FormClosingEventArgs e)
    {
      SaveItem_Click();
    }
  }