[Newbie] Zoom + Recent Files

Does anyone know where i can find a code that make a zoom on an image and a code to open recent files?

You're going to have to be more specific.

In a WinForms application?

I'm doing a pocket pc application. There's only a picture box cause i cannot make an mdi form.
The application must open big .tiff image like 7/8 MB
This is the code that open the image (i hope
-PrimeRecente and SecondoRecente are the buttons for the recent files...

Code:

....
private String NomeFile;
.....

private void Apri_Click(object sender, System.EventArgs e)
		{
			SecondoRecente.Text=NomeFile;
			OpenFileDialog fileChooser=new OpenFileDialog();
			fileChooser.Filter="tiff images (*.tiff)|*.tiff";
			DialogResult result = fileChooser.ShowDialog();
			//PictureBox.Image = Image.FromFile(fileChooser.FileName);
			//PictureBox.Image = new Bitmap(fileChooser.FileName);
			try 
			{
				PictureBox.Image = new System.Drawing.Bitmap(fileChooser.FileName);
			}
			catch 
			{
				ArgumentException eccezione = new ArgumentException();
			}

			PrimoRecente.Text=fileChooser.FileName;
			NomeFile = fileChooser.FileName;

This is the code for the zoom i hope

Code:

private void Zoom50_Click(object sender, System.EventArgs e)
		{
//			PictureBox.Width = PictureBox.Width - (PictureBox.Width * 0.5);
//			PictureBox.Height = PictureBox.Height - (PictureBox.Height * 0.5);
//			Ridisegna();
		}

private Sub Ridisegna(){
//					   PictureBox.SizeMode = PictureBoxSizeMode.StretchImage;
//					   if ((PictureBox.Width >= theScreen.width)||(PictureBox.Height >= thscreen.height)){
//						 vScrollBar.Maximum = PictureBox.Height + hScrollBar.Height; 
//						 hScrollBar.Maximum = PictureBox.Width + vScrollBar1.Width;
//						 panel1.Size = PictureBox.Size;
//						 hScrollBar.Value = 0;
//						 vScrollBar.Visible = True;
//						 hScrollBar.Visible = True;}
//					   else{
//						 vScrollBar1.Visible = False;
//						 hScrollBar1.Visible = False; }
//					   PictureBox.Ridisegna();
//
//		}