Multipage TIF Viewer

 Image currentImage = null;
 private int intCurrPage = 1, intPages = 1; // defining the current page (its some sort of a counter)
 System.IO.FileStream ImageFS = null;

 private void frmMain_Load(object sender, EventArgs e)
 {
   this.CloseImageFS();
   this.UpdateButtonStatus();
 }


 private void frmMain_FormClosed(object sender, FormClosedEventArgs e)
 {
   this.CloseImageFS();
 }



public void RefreshImage()
 {
   Image myBmp; // a new occurance of Image for viewing

   intPages = currentImage.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page); // getting the frameCount of the tiff
   // frameCount is Base.1, yet frames are accessed by Base.0, so we must correct the number of pages to FrameCount - 1
   lblNumPages.Text = intPages.ToString(); // showing the number of pages
   lblCurrPage.Text = intCurrPage.ToString() ; // showing the number of page on which we're on

   //frames are accessed by Base.0, so we need to subtract 1 from intCurrPage (Base.1) to reference the correct frame
   currentImage.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, intCurrPage - 1); // going to the selected page

   myBmp = new Bitmap(currentImage, pictureBox1.Width, pictureBox1.Height); // setting the new page as an image
   // Description on Bitmap(SOURCE, X,Y)

   pictureBox1.Image = myBmp; // showing the page in the pictureBox1
   this.UpdateButtonStatus();

 }

  private void UpdateButtonStatus()
  {
    this.btnPageNext.Enabled = this.btnPageNext.Enabled = false;
    if (this.intPages == 1)
    {
       this.btnPagePrev.Enabled = this.btnPageNext.Enabled = false;
       return;
    }
    if (intCurrPage == 1)
    {
      this.btnPagePrev.Enabled = false;
      this.btnPageNext.Enabled = true;
    }

    if (intCurrPage >=2)
    {
      this.btnPagePrev.Enabled = true;
      this.btnPageNext.Enabled = true;
      return;
    }

    if (intCurrPage == intPages)
    {
      this.btnPagePrev.Enabled = true;
      this.btnPageNext.Enabled = false;
      return;
    }
  }

   private void button1_Click(object sender, EventArgs e)
   {
     if (this.intCurrPage < 1) // it stops here if you reached the bottom, the first page of the tiff
       { this.intCurrPage = 1; }
       else
       {
         this.intCurrPage--; // if its not the first page, then go to the previous page
         if (this.intCurrPage == 1)
         {
           this.btnPageNext.Enabled = this.btnPageNext.Enabled = false;
         }
          this.RefreshImage(); // refresh the image on the selected page
       }
   }


   private void button2_Click(object sender, EventArgs e)
   {
       if (this.intCurrPage == intPages) // if you have reached the last page it ends here
         // the "-1" should be there for normalizing the number of pages
       {
         this.intCurrPage = intPages;
       }
       else
       {
         this.intCurrPage++;
         this.RefreshImage();
       }
   }


   private void btnOpen_Click(object sender, EventArgs e)
   {
     if (openFileDialog1.ShowDialog() == DialogResult.OK)
     {
       intCurrPage = 1; // reseting the counter
       lblFile.Text = openFileDialog1.FileName; // showing the file name in the lblFile
       currentImage = this.ImageLoadActual(@lblFile.Text);
       this.RefreshImage(); // refreshing and showing the new file
     }
   }


 private Image ImageLoadActual(string sFilePath)
 {
   Image tImage = null;

   try //try #a
   {
     this.CloseImageFS();

     ImageFS = new System.IO.FileStream(sFilePath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
     tImage = Image.FromStream(ImageFS);

   }// try #a
   catch (Exception ex)
   {
     string m = ex.Message;
   }// try #a
   finally
   {
   }// try #a
   return tImage;
 }//ImageLoadActual(string sFilePath)


 private void CloseImageFS()
 {
   if (ImageFS != null)
   {
     ImageFS.Close();
     ImageFS.Dispose();
   }//if (ImageFS != null)
 }//ClearImageFS()