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Definition:            Basically delegate is list of the methods with same parameter Use:            When you have many method and you want to call all method at same time with same parameter then delegate is use . Delegate is use when method takes same parameter as argument and also returns same data type value. Example:             here in example there is two methods name ‘method1’ and ‘method2’ these both method take same argument and dose not return any value. How to declare: For use delegate keyword delegate is used first you have to declare the delegate like delegate void Mydelegate ( string mystring); This delegate which return type is void and take ne argument as string an delegate name is “Mydelegate” How To Use :              For use this delegate we make instance of that delegate    and pass any one method name as argument and then other method name pass like below code and then pass argument for the method. Mydelegate md = new Mydelegate (method1); md += method2; md(