Something like:

   public static long FromLargeInteger (DirectoryEntry Entry, string
LargeAttribName)
   {
     ActiveDs.LargeInteger Work = (ActiveDs.LargeInteger)
Entry.Properties[LargeAttribName].Value ;
     return (((long) Work.HighPart) << 32) | (Work.LowPart & 0xFFFFFFFF) ;
   }

/LM

Hi Trevor,

A good place to go look for answers for these kind of questions is the
System.DirectoryServices portal on MSDN:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sds/sds/portal.asp

There's a Quick List for C# Code Examples under the "Using
System.DirectoryServices" node, which contains lots of code snippets
for common operations.

One of them is called "Large Integer Property Type" and gives you an
explanation and code sample as to how to access (read) and set (write)
a Large Integer property in AD.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sds/sds/large_i
nteger_property_type.asp

HTH
Marc