Check Windows Account Existence?

I have a user name, how can I check if this account exists? Do I use WMI or there is other ways to achieve it

Thanks
If you are using Active Directory (which I suppose you will be), then you can use System.DirectoryServices DLL to check the existence of a particular username. Here is a snippet from MSDN.System.DirectoryServices.DirectoryEntry entry = new System.DirectoryServices.DirectoryEntry("LDAP://Path");
System.DirectoryServices.DirectorySearcher mySearcher = new System.DirectoryServices.DirectorySearcher(entry);
mySearcher.Filter = ("(anr= John)");
foreach(System.DirectoryServices.SearchResult result in
mySearcher.FindAll())
{
Console.WriteLine( result.GetDirectoryEntry().Path );
}You need to add a reference to System.DirectoryServices.DLL before you can use this code.

Shuja Ali,

I just need to check windows local account existance. The client computers are not in any domain. Will this example work in htis case?

Tahnks

DirectorySearcher works for LDAP provider,for WinNT you can consider WMI,or you can use DirectoryEntry though
private bool IsGuestExist()
{
try
{
DirectoryEntry de = new DirectoryEntry(
"WinNT://<computer name>/Guest",
null,
null,
AuthenticationTypes.Secure
);

return de.NativeObject!=null;
}
catch(Exception)
{
return false;
}
}