loading multiple tables within dataset using store producer

CREATE PROCEDURE testSP
AS
BEGIN
 SELECT CategoryID,CategoryName,Description FROM Categories 
 SELECT SupplierID,CompanyName,ContactName FROM Suppliers
 SELECT ProductID,ProductName,CategoryID,SupplierID FROM Products
END
GO

C#

using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["NorthwindNewConnectionString"].ToString()))
{
 SqlDataAdapter da = new SqlDataAdapter("testSP",conn);
 da.SelectCommand.CommandType = CommandType.StoredProcedure;

 DataSet ds = new DataSet();

 da.Fill(ds);

 DataTable dtCategories = ds.Tables[0];
 DataTable dtSuppliers = ds.Tables[1];
 DataTable dtProducts = ds.Tables[2];
}