how to convert embedded formula to image in C#.net

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C#2.0

C#

how to convert any type of equations format
and save it as image in computer.can any one help me.

im using spire office software application for converting the equtions found in the word doc to image..the result im getting is whole word document is converted to image.

The result i want is the equations sholud be only converted to individual images.

The C# coding im using is

private void button1_Click(object sender, EventArgs e)
       {
           //Create word document
           Document document = new Document();
           document.LoadFromFile(@"..\..\..\..\..\..\Data\Word.doc");

           //Save doc file.
           Image img = document.SaveToImages(0, ImageType.Metafile);
           img.Save("sample.bmp", System.Drawing.Imaging.ImageFormat.Bmp);

           //Launching the image file.
           WordDocViewer("sample.bmp");
       }

       private void WordDocViewer(string fileName)
       {
           try
           {
               System.Diagnostics.Process.Start(fileName);
           }
           catch { }
       }

I have used many ways but not yet got the answer.pls help me and i want any type of equations to be converted to image.