using Microsoft.Practices.EnterpriseLibrary.Data;

private Database _db = DatabaseFactory.CreateDatabase("QuickStarts Instance");

private void MainForm_Load(object sender, System.EventArgs e)

{
    this.cmbCategory.Items.Clear();

    // TODO: Use a DataReader to retrieve Categories

    using (IDataReader dataReader = _db.ExecuteReader("GetCategories"))

    {
        // Processing code 

        while (dataReader.Read())

        {
            Category item = new Category(

                dataReader.GetInt32(0),

                dataReader.GetString(1),

                dataReader.GetString(2));

            this.cmbCategory.Items.Add(item);

        }

    }

    if (this.cmbCategory.Items.Count > 0)

        this.cmbCategory.SelectedIndex = 0;

}

private void cmbCategory_SelectedIndexChanged(object sender, System.EventArgs e)

{
    this.dsProducts.Clear();

    Category selectedCategory = (Category)this.cmbCategory.SelectedItem;

    if (selectedCategory == null)

        return;


    // TODO: Retrieve Products by Category

    _db.LoadDataSet(

        "GetProductsByCategory",

        this.dsProducts,

        new string[] { "Products" },

        selectedCategory.CategoryId);

}

private void btnSave_Click(object sender, System.EventArgs e)

{
    // TODO: Use the DataSet to update the Database 

    System.Data.Common.DbCommand insertCommand = null;

    insertCommand = _db.GetStoredProcCommand("HOLAddProduct");

    _db.AddInParameter(insertCommand, "ProductName",

        DbType.String, "ProductName", DataRowVersion.Current);

    _db.AddInParameter(insertCommand, "CategoryID",

        DbType.Int32, "CategoryID", DataRowVersion.Current);

    _db.AddInParameter(insertCommand, "UnitPrice",

        DbType.Currency, "UnitPrice", DataRowVersion.Current);

    System.Data.Common.DbCommand deleteCommand = null;

    deleteCommand = _db.GetStoredProcCommand("HOLDeleteProduct");

    _db.AddInParameter(deleteCommand, "ProductID",

        DbType.Int32, "ProductID", DataRowVersion.Current);

    _db.AddInParameter(deleteCommand, "LastUpdate",

        DbType.DateTime, "LastUpdate", DataRowVersion.Original);

    System.Data.Common.DbCommand updateCommand = null;

    updateCommand = _db.GetStoredProcCommand("HOLUpdateProduct");

    _db.AddInParameter(updateCommand, "ProductID",

        DbType.Int32, "ProductID", DataRowVersion.Current);

    _db.AddInParameter(updateCommand, "ProductName",

        DbType.String, "ProductName", DataRowVersion.Current);

    _db.AddInParameter(updateCommand, "CategoryID",

        DbType.Int32, "CategoryID", DataRowVersion.Current);

    _db.AddInParameter(updateCommand, "UnitPrice",

        DbType.Currency, "UnitPrice", DataRowVersion.Current);

    _db.AddInParameter(updateCommand, "LastUpdate",

        DbType.DateTime, "LastUpdate", DataRowVersion.Current);

    int rowsAffected = _db.UpdateDataSet(

        this.dsProducts,

        "Products",

        insertCommand,

        updateCommand,

        deleteCommand,

        UpdateBehavior.Standard);

}