InfoPath Dev

In the clicked event for a button in an InfoPath 2007 template, I have added code that is attempting to open an infopath form with this statement using C#:
This.Application.Xdocuments.Open(tempFileName); Also tried, This.Application.XmlForms.Open(tempFileName);

But I am getting this error:
Microsoft.Office.Infopath.Application does not contain a definition for xdocuments.

The following using statements are included:
using Microsoft.Office.InfoPath;
using System;
using System.Xml;
using System.Xml.XPath;
using System.IO;
using System.Text;

What am I missing?

Hi,

 I have tried to open a form with below code in infopath2007 and it is worked for me.

this.Application.XmlForms.Open(templatefilename);  

this.Application.XmlForms.Open(filename) also works for me without adding any using statements.

Application.Xdocuments doesn't exist in forms with the 2007 object model.

 Try:

using Microsoft.Office.InfoPath;
using Microsoft.Office.Interop.InfoPath;
using Microsoft.Office.Interop.InfoPath.Xml;