TrackBar on value changed event handler : TrackBar : GUI Windows Forms C# Examples

    
using  System;
using  System.Drawing;
using  System.Windows.Forms;

public  class  TrackBars  :  Form
{
    Panel  pnl;
    PictureBox  pb;
    TrackBar  htbar;
    TrackBar  vtbar;

    public  TrackBars()
    {
        Size  =  new  Size(500,520);

        Image  img  =  Image.FromFile("YourFile.bmp");

        pnl  =  new  Panel();
        pnl.Parent  =  this;
        pnl.BorderStyle  =  BorderStyle.FixedSingle;
        pnl.Size  =  new  Size(400,400);
        pnl.Location  =  new  Point(10,10);

        pb  =  new  PictureBox();
        pb.Parent  =  pnl;
        pb.Size  =  new  Size(200,  200);
        pb.Location  =  new  Point((pnl.Size.Width  /  2)  -  (pb.Size.Width  /  2),
                                (pnl.Size.Height  /  2)  -  (pb.Size.Height  /2));
        pb.BorderStyle  =  BorderStyle.FixedSingle;
        pb.SizeMode  =  PictureBoxSizeMode.StretchImage;
        pb.Image  =  img;

        htbar  =  new  TrackBar();
        htbar.Parent  =  this;
        htbar.Orientation  =  Orientation.Horizontal;
        htbar.Size  =  new  Size(pnl.Width,  10);
        htbar.Location  =  new  Point(pnl.Left,  pnl.Bottom  +  25);
        htbar.TickStyle  =  TickStyle.BottomRight;
        htbar.TickFrequency  =  25;
        htbar.Minimum  =  25;
        htbar.Maximum  =  400;
        htbar.SmallChange  =  10;
        htbar.LargeChange  =  25;
        htbar.BackColor  =  Color.Yellow;
        htbar.Value  =  pb.Width;
        htbar.ValueChanged  +=  new  EventHandler(htbar_OnValueChanged);

        vtbar  =  new  TrackBar();
        vtbar.Parent  =  this;
        vtbar.Orientation  =  Orientation.Vertical;
        vtbar.Size  =  new  Size(25,  pnl.Height);    
        vtbar.Location  =  new  Point(pnl.Right  +  25,  pnl.Top);
        vtbar.TickStyle  =  TickStyle.Both;
        vtbar.SetRange(25,400);
        vtbar.SmallChange  =  10;
        vtbar.LargeChange  =  50;
        vtbar.TickFrequency  =  vtbar.Maximum  /  20;
        vtbar.BackColor  =  Color.Pink;
        vtbar.Value  =  pb.Height;
        vtbar.ValueChanged  +=  new  EventHandler(vtbar_OnValueChanged);

    }

    private  void  htbar_OnValueChanged(object  sender,  EventArgs  e)
    {
        pb.Size  =  new  Size(htbar.Value,  pb.Height);
    }

    private  void  vtbar_OnValueChanged(object  sender,  EventArgs  e)
    {
        pb.Size  =  new  Size(pb.Width,  vtbar.Value);
    }

    static  void  Main()  
    {
        Application.Run(new  TrackBars());
    }
}