public static string CreateUserAccount(string ldapPath, string userName, string userPassword)

{

    string oGUID = string.Empty;

    try

    {

        //    for example an ldap path : 
        //    10.20.12.11:389/OU=PORTAL,DC=TESTDOMAIN,DC=entptst,DC=local

        string connectionPrefix = "LDAP://" + ldapPath;

        DirectoryEntry dirEntry = new DirectoryEntry(connectionPrefix, "TESTDOMAIN\\admin", "secret");

        DirectoryEntry newUser = dirEntry.Children.Add("CN=" + userName, "user");

        newUser.Properties["samAccountName"].Value = userName;

        newUser.CommitChanges();

        oGUID = newUser.Guid.ToString();

        //If you dont have an SSL connection you can not set password

        newUser.Invoke("SetPassword", new object[] { userPassword });

        newUser.Properties["LockOutTime"].Value = 0;

        //Enable user

        int val = (int)newUser.Properties["userAccountControl"].Value;

        newUser.Properties["userAccountControl"].Value = val & ~0x2;

        newUser.CommitChanges();

        dirEntry.Close();

        newUser.Close();

    }

    catch (System.DirectoryServices.DirectoryServicesCOMException E)

    {

        //DoSomethingwith --> E.Message.ToString();

    }

    return oGUID;

}