Same convention as everything else in .NET: camel case descriptive name only, optionally followed by a suffix if you need to distinguish different classes for the same logical "thing". For example:
string name; // a name
TextBox nameText; // the control used to edit the name
Label nameLabel; // the control used to label the edit control
List nameList; // a list of names
and so on ad infinitum. It really doesn't matter what the suffixes are as long as they are consistent and descriptive.
