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public DataUtilities() { } public static string ConnectionString { get { return connectionString; } set { DataUtilities.connectionString = value; } } } } Then every other place where a connection string is used will be replaced with a property getter call to the DataUtilities class. One example is the ProductData class in the DataLayer project. That class will now look like Listing 15-2. Listing 15-2. ProductData.cs with Call to DataUtilities.cs #region Using directives using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Odbc; using System.Text; using BusinessLayer; #endregion namespace DataLayer { public class ProductData { public ProductData() { } public static ArrayList GetProductsByCategory(int categoryID) { ArrayList products = new ArrayList();

The results of this example, when compiled and executed, are as follows: (add 4 5) = 9 In F#, a function has a fixed number of arguments and is applied to the value that appears next in the source file You do not necessarily need to use parentheses when calling functions, but F# programmers often use them to define which function should be applied to which arguments Consider the simple case where you want to add four numbers using the add function You could bind the result of each function call to new identifier, but for such a simple calculation, this would be very cumbersome: let add x y = x + y let result1 = add 4 5 let result2 = add 6 7 let finalResult = add result1 result2 Instead, it often better to pass the result of one function directly to the next function.

You may have noticed that there are only eight vectors used for this vector movement. If we were to precalculate these vectors and insert them into the code directly, we could reduce the amount of work done when running the script. It s worth doing as an exercise if you like a challenge, but since calculating the heading vector is only ever done once per frame, speeding it up will make no noticeable difference to the frame rate. Keep your eye out for situations like this; reducing the amount of work the game must do to creating a frame is called optimizing and gets more important when there is a lot of action on the screen.

try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = DataUtilities.ConnectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("SELECT * FROM Products WHERE CategoryID="); commandText.Append(categoryID); commandText.Append(" AND UnitsInStock > 0"); dataCommand.CommandText = commandText.ToString(); OdbcDataReader dataReader = dataCommand.ExecuteReader(); while (dataReader.Read()) { Product product = new Product(); product.ProductID = dataReader.GetInt32(0); product.ProductName = dataReader.GetString(1); product.CategoryID = dataReader.GetInt32(3); product.Price = dataReader.GetDecimal(5); product.Quantity = dataReader.GetInt16(6); products.Add(product); } dataConnection.Close(); } catch(Exception e) { Console.WriteLine("Error: " + e.Message); } return products; } public static Product GetProduct(int ProductID) { Product product = null;

To do this, you use parentheses to show which parameters are associated with which functions: let add x y = x + y let result = add (add 4 5) (add 6 7) Here, the second and third occurrences of the add function are grouped with the parameters 4, 5 and 6, 7, respectively, and the first occurrence of the add function will act on the results of the other two functions F# also offers another way to compose functions, using the pipe-forward operator (|>) This operator has the following definition: let (|>) x f = f x This simply means it takes a parameter, x, and applies that to the given function, f, so that the parameter is now given before the function The following example shows a parameter, 05, being applied to the function SystemMathCos using the pipe-forward operator: let result = 0.