Local variables used in an anonymous method are called outer variables.

  

using System;

public delegate void DelegateClass(out int arg);

public class Starter {

    public static void Main() {

        DelegateClass del = MethodA();
        int var;
        del(out var);

        Console.WriteLine(var);
    }

    public static DelegateClass MethodA() {
        int local = 0;
        return delegate(out int arg) {
            arg = ++local;
        };
    }
}

Related examples in the same category

1.	Define an anonymous method with the delegate keyword.
2.	Anonymous methods can refer to local variables of the containing function and class members within the scope of the method definition
3.	Anonymous methods can be assigned a signature, which is appended to the delegate keyword.
4.	two delegates and anonymous methods
5.	Anonymous methods can be assigned a signature
6.	Associating the delegate with an anonymous method.

Local variables used in an anonymous method are called outer variables. : delegate anonymous « Language Basics « C# / C Sharp

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