Method Within A Method

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If by nested method, you mean a method that is only callable within that method (like in Delphi) you could use delegates.

public static void Method1()
{
   var method2 = new Action(() => { /* action body */ } );
   var method3 = new Action(() => { /* action body */ } );

   //call them like normal methods
   method2();
   method3();

   //if you want an argument
   var actionWithArgument = new Action<int>(i => { Console.WriteLine(i); });
   actionWithArgument(5);

   //if you want to return something
   var function = new Func<int, int>(i => { return i++; });
   int test = function(6);
}

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