Check these two cases private void button4_Click(object sender, EventArgs e) { Func<string, string> GreetHellow = delegate(string var1) { return " Hellow 2 " + var1; }; Func<string, string> GreetHi = var1 => " hi 2 " + var1; Console.WriteLine(GreetHellow("Janaganamana")); Console.WriteLine(GreetHi("Janaganamana")); } OR Func<string, string> GreetHellow = delegate(string var1) { return " Hellow 2 " + var1; }; Func<string, string> GreetHi = var1 => " hi 2 " + var1; private void button4_Click(object sender, EventArgs e) { Console.WriteLine(GreetHellow("Janaganamana")); Console.WriteLine(GreetHi("Janaganamana")); } Both give following output //Hellow 2 Janaganamana //hi 2 Janaganamana

Now check a similar case private void button3_Click(object sender, EventArgs e) { var inc = GetAFunc(); Console.WriteLine(inc(5)); globalint = 10; Console.WriteLine(inc(5)); } static int globalint = 0; public static Func<int, int> GetAFunc() { int x = 10; int y = 10; var myVar = x + y + globalint; Func<int, int> inc = delegate(int var1) { myVar = myVar + 1; return var1 + myVar; }; return inc; } Notice the following lines are visited only once ( once to get func pointer) output is 26 27 so "globalint = 10;" is not reflected. Also notice "myVar " is a live variable that keeps latest value (myVar = myVar +1 " keeps incrementing.

It may look little ODD (but is Fair - CLOSURE) while breakpoint dont stop @ "var myVar = x + y + globalint; " It stops only once while fetching func pointer. Notice myVar works within the scope (CLOSURE)of this button click event (it incremented within this scope.)