Give a detailed explanation of Delegates in C#

Question

Nishi Tiwari · Answer

Delegates can be defined as an object refer to a methods or we can say that
it is a referenced type variable that holds the reference of a method. It is similar to pointer function in C and Cand#43;and#43;, but is
object-oriented, secure and type safe than function pointer. It is used for implementing events and call back methods. For example, if we click on Button on forms (windows application), then program would call a specific method or it is a type reference to a method with particular parameter list and return type and then calls methods when it is needed. All delegates are implicitly derived from System.Delegates class. 
For declaring delegates following syntax is used 
Delegate andlt;return typeandgt; delegate_name andlt;parameter listandgt;
After declaring delegates objects are instanced with new keyword. 
Syntax for instantiating delegates 
[delegate_name]  instance_name=new [delegate_name] (calling_method_name);
Example
using System;
delegate int NumberChanger(int n);and namespace DelegateAppl {
  and class TestDelegate {and and  and  and  static int num = 10;
     and 
public static int AddNum(int p) {and and  and  and  and  and num and#43;= p;
and  and  and  and  and return num;
and  and  and  }
and  and  and  public static int MultNum(int q) {
and  and  and  and  and num *= q;
and  and  and  and  and return num;
and  and  and  }
and  and  and  public static int getNum() {
and  and  and  and  and return num;
and  and  and  }
and  and  and  static void Main(string[] args) {
and  and  and  and  and //create delegate instances
and  and  and  and  and NumberChanger nc1 = new NumberChanger(AddNum);
and  and  and  and  and NumberChanger nc2 = new NumberChanger(MultNum);
and  and  and  and  and //calling the methods using the delegate objects
and  and  and  and  and nc1(25);
and  and  and  and  and Console.WriteLine(andquot;Value of Num: {0}andquot;, getNum());
and  and  and  and  and nc2(5);
and  and  and  and  and Console.WriteLine(andquot;Value of Num: {0}andquot;, getNum());
and  and  and  and  and Console.ReadKey();
and  and  and  }
and  and }
}
Output: 
Value of Num: 35
Value of Num: 175

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Give a detailed explanation of Delegates in C#

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