I’m a big fan of enabling XML comments when you’re working on a project (either alone or as a team) because it helps you quickly identify what has and what has not been documented.  When you have XML comments enabled, the compiler will show warnings for any public and protected classes / class members that do not have XML comments.  To enable XML comments you just check the XML documentation file option in the build tab of the project properties page. 

One of the issues that you run into, however, is that there can be a number of code generated files in your projects, and you have no control over that code.  But, if that file is no re-generated often, then you can insert a bit of code to suppress XML comment warnings from that file:

// Disable all XML Comment warnings in this file //
#pragma warning disable 1591

The next time you compile, XML comment warnings from the file will not be display.  If you’re wondering, the 1591 is the specific warning number for XML comments.  If you remove the XML comment warning number from the pragma statement, then all warnings from the file are suppressed, not just XML comment warnings.  no warnings will come from the file.  You can also tack on additional warning codes to suppress additional types of warnings, if desired.  How do you figure out what the numbers are?  I find one of the easiest ways to go about it is to read the output window (NOT the Error List window).  When a warning is generated, it normally looks something like the following:

[filename]: warning CS1591: Missing XML comment for publicly visible type or member ‘VSeWSS.TargetListAttribute’

Notice there is a number right after the warning (in this case its CS1591)?  Just drop the alpha prefix and you’ve got your warning number.  Since this is in the output window, you may have to scroll through the text a bit to actually find the warning, but it should be in there somewhere.