Answer 1

Answer 2

使用System.DirectoryServices

To use this namespace you need to add reference  System.DirectoryServices.dll 

       DirectoryEntry ouEntry = new DirectoryEntry("LDAP://OU=TestOU,DC=TestDomain,DC=local");

        for (int i = 3; i < 6; i++)
        {
            try
            {
                DirectoryEntry childEntry = ouEntry.Children.Add("CN=TestUser" + i, "user");
                childEntry.CommitChanges();
                ouEntry.CommitChanges();
                childEntry.Invoke("SetPassword", new object[] { "password" });
                childEntry.CommitChanges();
            }
            catch (Exception ex)
            {

            }
        }

使用System.DirectoryServices.AccountManagement

 To use this namespace you need to add reference  System.DirectoryServices.AccountManagement.dll 

              PrincipalContext ouContex = new PrincipalContext(ContextType.Domain, "TestDomain.local",           "OU=TestOU,DC=TestDomain,DC=local");

        for (int i = 0; i < 3; i++)
        {
            try
            {
                UserPrincipal up = new UserPrincipal(ouContex);
                up.SamAccountName = "TestUser" + i;
                up.SetPassword("password");
                up.Enabled = true;
                up.ExpirePasswordNow();
                up.Save();
            }
            catch (Exception ex)
            {

            }
        }