Parameter in C#

Question

When I want get total value of memory in C# I found a kernel32 function in MSDN to invoke data from system. MSDN declare function this way:

[return: MarshalAs(Un         


        

Answer 1

In: http://msdn.microsoft.com/de-de/library/system.runtime.interopservices.inattribute.aspx

Out: http://msdn.microsoft.com/de-de/library/system.runtime.interopservices.outattribute.aspx

Short: They control the way data is marshalled. In this case, where you specify both of them, it means that data is marshalled to both sides (caller and callee).