EndPoint: Syntax in C# - what is this?

Question

I'm reviewing some code on the project I recently joined, and in a C# Win Forms Application for .NET 3.5 I found this:

public void foo()
{
    //Normal code for function foo.

//This is at the end and it is left-indented just as I put it here.
EndPoint:
    {
    }
}

When I click "EndPoint/Go To Definition" it says "Cannot Navigate to Endpoint" but the project as a whole is pretty small and compiles/runs without error, so it's not a missing reference or anything.

What is EndPoint and what is this syntax with the name : {}?

Answer 1

Others have explained what the EndPoint: is. The extra braces are creating a new scope. By creating an inner scope you can do something like this

public Foo()
{
    {
        int bar = 10;
        Console.WriteLine(bar);
    }

    Console.WriteLine(bar); //Error: "Cannot resolve symbol bar."  It does not exist in this scope.

    {
        int bar = 20;  //Declare bar again because the first bar is out of scope.
        Console.Writeline(bar);
    }
}

Answer 2

Its for goto. See: http://msdn.microsoft.com/en-us/library/13940fs2%28VS.71%29.aspx

The syntax with the colons specifies the labels where the goto statement will transfer control to. You can use it in C#, but most developers tend to avoid it. Sometimes it can be useful to break out of nested loops (that's the best I can come up with for a "legitimate" usage)

Here's a nice writeup on some of the more useful usages of goto: http://weblogs.asp.net/stevewellens/archive/2009/06/01/why-goto-still-exists-in-c.aspx

EDIT: Just to comment on the error you get about going to definition, that's understandable. There is no "definition" source for the label. Perhaps "go to definition" on the goto Endpoint; might jump to the label, but I'm not sure -- never tried it. If your code that you have there only has the Endpoint: label but no goto Endpoint; anywhere, then it should be safe to delete the label because (I'm assuming) it's an unused remnant of old code.