Check UserID exists in Active Directory

Please add the System.DirectoryServices.AccountManagement namespace and assembly to your code.

public string DoesUserExist(string userName)

        { 

            using (var domainContext = new PrincipalContext(ContextType.Domain, "spl"))

            {

                using (var foundUser = UserPrincipal.FindByIdentity(domainContext, IdentityType.SamAccountName, userName))

                {

                    if (foundUser != null)

                        return foundUser.Name;

                    else

                        return "User Does not exist ";

                }

            }        }