Sorry, the .NET Framework classes are a Microsoft product and therefore they are documented by Microsoft.
When you use COBOL you are still accessing the same underlying .NET Framework classes and the methods, events and properties are all the same.
In COBOL you use a slightly different syntax than in C#.
You use the invoke statement to access methods without a returning value.
You use set or some other statement to access methods or properties that have a returning value.
Thanks,