I am writing a C# code that was validating a user's password with directoryentry(path, username, password), but I noticed that when the "change password at next logon" is checked in AD, directoryentry(path, username, password) does not work whether you enter in the correct current password or not.  Does anyone know how to validate a user's current password with C# when the "change password at next logon" is checked.  Thanks.

 -IJ

 Just to add to mahmoud post here is the link to a reference for the code mentioned.

http://www.codeproject.com/KB/cs/zetaimpersonator.aspx