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()