Some Useful C# attributes

S.No.	Attribute	Description & Usage
1.	Obsolete	Marks a program entity (method, property, field, etc) that should not be used.  This is useful to make an old/ unwanted/ outdated method as not usable one without removing or commenting it. [Obsolete] Public  method OldCompute(int x, int y) { … } -  above code give a warning message during compilation [Obsolete("Do not use this method", true)] -   above code will give error message with given message
2.	Category	It groups a property under a category in property grid.
3.	Description	It is used to set description to a property [Category("Appearance")] [Description("The caption")] Public  string Caption { get  { return _caption; } set  { _caption = value; } }
4.	Conditional	It defines a method whether it will be executed or not when a call. #define “Debug” .. .. [Conditional("Debug")] public  void  LogMsg(string  msg) { … } .. .. LogMsg(“reached here”) .. #undef “Debug” .. .. [Conditional("Debug")] public  void  LogMsg(string  msg) { … } .. .. LogMsg(“reached here”) .. Here the LogMsg method will be executed Here the LogMsg method will not be executed
5.	DllImport	It is used to import an external dll or API using System.Runtime.InteropServices; public class test { [DllImport("kernel32.dll")] public static extern bool Beep(int frequency,int duration); static void Main() { Beep(1000,111); } }
6.	CLSComplaint	It is used to tell the compiler to check whether the code is CLSComplaint or not. If it is true the compiler will give warning message for non-CLSComplaint code. [assembly:CLSCompliant(true)] the above attribute’s target is assembly. [CLSCompliant(true)] the target can be a class or method and before this it is must to set assembly level CLSCompliant attribute.

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