The problem here is that you've defined an anonymous method which returns a string but are trying to assign it directly to a string.It's an expression which when invoked produces a string it's not directly a string.It needs to be assigned to a compatible delegate type. Anonymous methods in C# can be defined using the delegate keyword and can be assigned to a variable of delegate type. public delegate void Print (int value); static void Main (string[] args) { Print print = delegate(int val) { Console.WriteLine ("Inside Anonymous method. Value: {0}", val); }; print (100); } Inside Anonymous method. Value: 100. Everything is alright. I just understood that I wanted impossible things. I wanted to declare anonymous function and execute it in the same place. Note: DIRECT declaring and DIRECT call without generic wrapper. // flash-like (as3) code /// DOES NOT COMPILE makeOutput( (function : int(){ return 0; })() ); Anonymous Delegates for C#. A Lambda expression is an anonymous function that can contain expressions and statements. They are also used to create delegates or expression tree types. Expressions can be mystifying, but simply put, they are nothing more than code represented as data and objects in a .NET application. In C# 1.0 you create a delegate instance and initialize with a method reference. C# 2.0 introduced Anonymous methods that can be executed with delegate invocation. Then in C# 3.0, lambda expressions are similar in concept to anonymous methods but more expressive and conches. These two concepts are collectively known as anonymous functions. Besides named function, C# also supports anonymous function, represented by anonymous method or lambda expression with no function name at design time. Lambda expression can also represent expression tree, This chapter discusses lambda expression as a functional feature of C# language. As per MSDN, a lambda expression is an anonymous function, that we can use to create delegates or expression tree types. What we can infer from this statement is that a lambda expression is an unnamed method which can be replaced with a delegate instance . C# 2.0 introduced the concept of anonymous methods as a way to write unnamed inline statement blocks that can be executed in a delegate invocation. C# 3.0 introduced lambda expressions, which are similar in concept to anonymous methods but more expressive and concise. These two features are known collectively as anonymous functions. Anonymous functions are of two types in C# which are Lambda expressions in C# and Anonymous methods in C# where the anonymous function used to create delegates is called Lambda expression in C# using which local functions can be created and can be passed as an argument and the queries of LINQ can also be written with the help of Lambda expressions. It is called an anonymous method. It is also known as inline delegate. Anonymous method is a method without name, it provides us a way of creating delegate instances without having to write a separate method or a function, as shown above. The code given above is rewritten, using anonymous method, as shown below.
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