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Year 1 Customers Retention rate Spending rate Revenue Cost percent Costs Acquisition cost ($140) Marketing cost ($6) Total costs Pro t Discount rate NPV of pro t Cumulative NPV of pro t Lifetime value 400,000 66% $332 $132,800,000 65% $ 86,320,000 $ 56,000,000 $ 2,400,000 $144,720,000 $11,920,000 1 $11,920,000 $11,920,000 $30 Year 2 264,000 74% $352 $92,928,000 63% $58,544,640 $ 1,584,000 $60,128,640 $32,799,360 1.22 $26,884,721 $14,964,721 $37.41 Year 3 195,360 78% $362 $70,720,320 62% $43,846,598 $ 1,172,160 $45,018,758 $25,701,562 1.35 $19,038,194 $34,002,915 $85.01

Generic delegates are very much like nongeneric delegates, except that the type parameters determine the characteristics of what methods will be accepted. To declare a generic delegate, place the type parameter list in angle brackets after the delegate name and before the delegate parameter list.

Year 1 Old LTV New LTV Difference 400,000 customers $28.00 $29.80 $1.80 $720,000 Year 2 $35.93 $37.41 $1.48 $592,262 Year 3 $78.69 $85.01 $6.32 $2,527,641

Type parameters delegate R MyDelegate<T, R>( T value ); Return type Delegate formal parameter Notice that there are two parameter lists: the delegate formal parameter list and the type parameter list. The scope of the type parameters includes the following: The return type The formal parameter list The constraint clauses

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Draw, the SpriteBatch will put them on a stack However, at the moment you ask to draw a sprite that uses another texture, the sprites on the current stack will be drawn first immediately Using the first four modes, only at the call to SpriteBatchEnd, the sprites will be sorted, the render states will be set, and the triangles and textures will be sent to the graphics card This allows you to use multiple objects of the SpriteBatch class and add new sprites to them in a random order, or even draw 3D objects using their own render states Using the Immediate mode, however, the render states will be set at the moment you call the SpriteBatchBegin method, and the sprites will be rendered after the call to SpriteBatchDraw.

The following code shows an example of a generic delegate. In Main, generic delegate MyDelegate is instantiated with an argument of type string and initialized with method PrintString. delegate void MyDelegate<T>(T value); class Simple { static public void PrintString(string s) { Console.WriteLine(s); } static public void PrintUpperString(string s) { Console.WriteLine("{0}", s.ToUpper()); } } class Program { static void Main( ) { var myDel = // Create inst of delegate new MyDelegate<string>(Simple.PrintString); myDel += Simple.PrintUpperString; // Add a method. myDel("Hi There."); } } This code produces the following output: Hi There. HI THERE. // Call delegate // Generic delegate

Mailing Response Response revenue Less mailing Per name Offer price Sales Commission 100,000 1,200 $0.05 1.20% $78.69 $5,000 $5,000.00 $94,425.82 $89,425.82 $0.89 $0.45 $1.34

Since the LINQ feature of C# 3.0 uses generic delegates extensively, it s worth showing another example before we get there. I ll cover LINQ itself, and more about its generic delegates, in 21. The following code declares a generic delegate named Func, which takes methods with two parameters and that return a value. The method return type is represented as TR, and the method parameter types are represented as T1 and T2. Delegate parameter type public delegate TR Func<T1, T2, TR>(T1 p1, T2 p2); // Generic delegate class Simple Delegate return type { static public string PrintString(int p1, int p2) // Method matches delegate { int total = p1 + p2; return total.ToString(); } } class Program { static void Main() { var myDel = // Create inst of delegate new Func<int, int, string>(Simple.PrintString); Console.WriteLine("Total: {0}", myDel(15, 13)); } } This code produces the following output: Total: 28 // Call delegate

Generic interfaces allow you to write interfaces where the formal parameters and return types of interface members are generic type parameters. Generic interface declarations are similar to nongeneric interface declarations but have the type parameter list in angle brackets after the interface name. For example, the following code declares a generic interface called IMyIfc. Simple is a generic class that implements generic interface IMyIfc. Main instantiates two objects of the generic class: one with type int and the other with type string.

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Type parameter interface IMyIfc<T> { T ReturnIt(T inValue); } Type parameter Generic interface class Simple<S> : IMyIfc<S> { public S ReturnIt(S inValue) { return inValue; } } class Program { static void Main() { var trivInt = new Simple<int>(); var trivString = new Simple<string>();

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