Agregar usuario a Site de Sharepoint

static void AddAXUserToSharepointGroup(Args _args)
{
	Microsoft.SharePoint.SPWeb                  spWeb;
	Microsoft.SharePoint.SPSite                 spSite;
	Microsoft.SharePoint.SPGroupCollection  	spGroupCollection;
	Microsoft.SharePoint.SPGroup                spGroup;
	Microsoft.SharePoint.SPUserCollection    	spUserCollection;
	Microsoft.SharePoint.SPUser                 spUser;
	EPWebSiteParameters                         epWebSiteParameters;
	UserInfo                                    userInfo;
	SysUserInfo                                	sysUserInfo;
	str                                         loginName;
	System.Exception                            ex;
	str                                         siteGroupName;
	;
 
	try
	{
		//Sharepoint registrado en AX2009
		select firstonly epWebSiteParameters;
		select firstonly userInfo
			where userInfo.id == curUserId();
 
		select firstonly sysUserInfo
			where sysUserInfo.Id == curUserId();
 
		loginName           = userInfo.networkDomain + '\\' + userInfo.networkAlias;
		spSite              = new Microsoft.SharePoint.SPSite(epWebSiteParameters.InternalUrl);
		spWeb               = spSite.get_RootWeb();
 
		//Crea el usuario en Sharepoint
		spUserCollection    = spWeb.get_SiteUsers();
		spUserCollection.Add(loginName, sysUserInfo.Email, userInfo.name, "");
 
		//Agrega el usuario al grupo de propietarios
		spUser              = spUserCollection.get_Item(loginName);
		spGroupCollection   = spWeb.get_SiteGroups();
		siteGroupName       = CLRInterop::getAnyTypeForObject(spWeb.get_Title()) + " Owners"; //Or Visitors, Members
		spGroup             = spGroupCollection.get_Item(siteGroupName);
		spGroup.AddUser(spUser);
		spGroup.Update();
	}
	catch (exception::CLRError)
	{
		ex = CLRinterop::getLastException();
		try
		{
			if (ex)
			{
				info(ex.ToString());
			}
		}
		catch (exception::Internal)
		{
			ex = clrinterop::getLastException();
			if (ex)
			{
				info(ex.ToString());
			}
		}
	}
}