if you write a class in C# and then write summary of it's methods
for Example:
class MyClass
{
public MyClass()
{}
///<Summary>
///The Summary Of Function
///</Summary>
public void MyFunction(){}
}
the summary of function will show when you are using C#. but if you add your Class as a refrence to a VB language project it will not work
and the same problem is for operator definitions if you define operator in C# it will only work in C# not in VB

Summary Of method in C#, don't work in VB
budzombie
Hi Hamed,
You can access the comments of C# in VB.Net easily what you have to do is …
Go to the properties of C# project aBuild aOutput and check the XML documentation file.
Make sure that DLL and XML file are in the same directory and same name (as by defult they are). As VB.net will try to search comments from the file DLL name.XML.
Hope this help