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Define OS constant for compilation

#define win2000 #define release #undef win98  using System; using System.Diagnostics; class MainClass {     [Conditional("DEBUG")]     public static void DumpState()     {         Console.WriteLine("Dump some state...");     }     public static void Main()     {        string platformName;        #if winXP         //Compiling for Windows XP            platformName = "Microsoft Windows XP";        #elif win2000     // Compiling for Windows 2000            platformName = "Microsoft Windows 2000";        #elif winNT       // Compiling for Windows NT            platformName = "Microsoft Windows NT";        #elif win98       // Compiling for Windows 98            platformName = "Microsoft Windows 98";        #else              // Unknown platform specified            platformName = "Unknown";        #endif        Console.WriteLine(platformName);        // Call the conditional DumpState method        DumpState();     } }