How to Authenticate LDAP in .NET

I would like to authenticate username and passwords for my application on a windows operating system with any directory service.  For example it could be microsoft active directory, Novell eDirecotry, or SunOne.  I already know how to do this code natively for Microsoft Active Direcotry with c#.  ( I totally gave up using ADSI and creating a low level com component)

The way im attempting to authenticate with Novel eDirecotory is i have installed the Mono project.  Inside the mono project they provide you with Novell.Directory.ldap.dll  The code looks somewhat the same as for Microsoft Active Directory.(

For SunOne, i have been told to use the same code as active direcotry, but the ldap connecton string is a little different.(

To complicate my project, most customers use a "Service account:" which means i need to bind with an administrative username and password before i can authenticate a regular username and password.  My questions is in 2 parts.

1) From what I have explained above, is this the correct direction I should be going to authenticate against each individual direcotory service?  

2) I feel that i dont not need to do any of this code at all.  I also feel the stipulation of using a service account is not imporant at all. If all I care about is authenticating a username and password on a windows machine why do i even need to use ldap?  I mean think about it.  When you login to your machine in the morning, you do not have to provide a service account just to login.  I can easily authenticate a username and password at a DOS prompt by using the runas feature and i will be denied or not and could parse the text file.  Im sure there are other ways i could pass a username and password to the windows operating system that i am on and will tell me if a username and password is valid for the domain that it is on.  Am i right?  If so what suggested ways do you guys have?
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We had a website that needed to authenticate a username and password against domain credentials and used the LogonUser API function. Use it for a network logon (one of its arguments is logon type) and all it does is validate credentials, it doesn't do things like load the users profile that runas would. Only caveat is that the service account does require sufficient access to call LogonUser. I suggest you check the MSDN documentation for what that access is though because it varies by OS.

But this isnt always the best way, u will need local admin in order to make this api call, googling things, if u read this thread they say there is an api call that doesnt not require this AcquireCredentialsHandleNT with is in security.dll  
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