using System;

using CMS.Community;

using CMS.UIControls;

using CMS.CMSHelper;

...

        // Create new invitation object

        InvitationInfo ii = new InvitationInfo();

        // Set properties

        ii.InvitationComment = "Invitation comment";

        ii.InvitationGroupID = 1;

        ii.InvitationUserEmail = "admin@localhost.local";

        ii.InvitedByUserID = CurrentUser.UserID;

        ii.InvitationCreated = DateTime.Now;

        ii.InvitationValidTo = DateTime.Now.AddDays(1);

        // Save object

        InvitationInfoProvider.SetInvitationInfo(ii);