Using directive doesn't work

Question

Hey guys,

In my Forms class i have the following "Using" statements:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using Microsoft.Office.Interop;using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using Microsoft.Office.Interop;

In my class I use the following code:

public void DrawSampleShapeConnection()

        {

            // get the current draw page

            Visio.Page currentPage = VisioPane.Document.Pages[1];

        }

But this doesnt work, the compiler gives an error on Visio:
The type or namespace name 'Visio' could not be found (are you missing a using directive or an assembly reference?
I've tried the following and that does work:

 public void DrawSampleShapeConnection()

        {

            // get the current draw page

            Microsoft.Office.Interop.Visio.Page currentPage = VisioPane.Document.Pages[1];

        }

I don't understand why the compiler won't take my reference.


Any help is very much appreciated.


Kind regards,
Daniel

EDIT: Past code with IE9 is not advised.... Chrome works better