C#

private void MyForm_KeyDown(object sender,
  KeyEventArgs e)
{
  if (e.KeyCode == Keys.X && e.Control)
  {
    e.Handled = true; // Don't let child controls process this
    this.Close(); // Close your form or use Application.Exit()
  }
}

void OpenBitmap()
{
    OpenFileDialog dlg=new OpenFileDialog();

    //get available image format decoders, and create a filter string from them
    //TODO: Filter out metafile formats!
    ImageCodecInfo[] decoders=System.Drawing.Imaging.ImageCodecInfo.GetImageDecoders();
    string allfiltersname="All Supported Bitmap Files (";
    string allfilters="";
    ArrayList filters=new ArrayList();
    for(int i=0;i<decoders.GetUpperBound(0);i++)
    {
        allfilters+=(i==0?"":";")+decoders[i].FilenameExtension;
        filters.Add(decoders[i].CodecName+ 
                " (" + decoders[i].FilenameExtension + ")|" + 
                decoders[i].FilenameExtension);
    }
    dlg.Filter=allfiltersname+allfilters+"|"+allfilters+"|"+
                String.Join("|",((string[])(filters.ToArray(typeof(string)))));
    
    
    dlg.Title="Open a Bitmap";
    dlg.ShowDialog((IWin32Window)this);
    
    if(dlg.FileName!="")
    {
        Bitmap b=null;
        try{b = new Bitmap(dlg.FileName);}
        catch(Exception e)
        {
                MessageBox.Show(
                        "The bitmap could not be loaded, because there was an error:\r\n\r\n" + 
                        e.ToString(),
                        "Error Loading Bitmap!",
                        MessageBoxButtons.OK,MessageBoxIcon.Error);
        }
        if(b!=null)
        {
            
            //TODO: set the PictureBox's image property
        }
        
    }
}