The loop has an empty body, so it's just that one line. It keeps
incrementing i until i >= maxX or isCellEmpty returns false.

No C# has had this syntax since day one. VB got a similar feature
(custom events) in the 2005 release. But unless you have a good reason
for using it you can simply go with

Public Event OnGameWon As EventHandler

Mattias

Here's the actual VB equivalent (via our Instant VB C# to VB converter) -
note that VB (2005) requires the RaiseEvent section.

Private Function path1(ByVal p1 As point, ByVal p2 As point) As point()
       Dim minX As Integer = Math.Min(p1.X, p2.X)
       Dim maxX As Integer = Math.Max(p1.X, p2.X)
       i = minX + 1
       Do While i < maxX AndAlso isCellEmpty(p1.Y, i)

               i += 1
       Loop
       If i = maxX Then
               Return New Point() { p1, p2 }
       Else
               Return Nothing
       End If
End Function

Public Custom Event OnGameWon As EventHandler
       AddHandler(ByVal value As EventHandler)
           AddHandler gameWon, value
       End AddHandler
       RemoveHandler(ByVal value As EventHandler)
           RemoveHandler gameWon, value
       End RemoveHandler
       RaiseEvent(ByVal sender As System.Object, ByVal e As
System.EventArgs)
       End RaiseEvent
End Event