.NET naming convention for “ID” (anything identification: Capitalization)

Question

I am in the process of unifying these inconsistent naming conventions and this one problem has been a bit driving me crazy lately.

In the code base I am working with has

Answer 1

Microsoft has updated its guidelines since this question was asked.

In the MSDN article Capitalization Conventions (.NET Framework 4.5), there is a section named Capitalizing Compound Words and Common Terms. Within the table in this section, the following capitalization guidelines are given for the abbreviation for "identifier" when naming identifiers:

• When Pascal casing applies, use Id. (Example: System.Attribute.TypeId)
• When Camel casing applies, use id. (Example: var id = 42;)
• Never use ID.