Csharp/CSharp Tutorial/GUI Windows Forms/Form Paint

FormPaint Event

<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class FormPaintEvent : Form {

 public FormPaintEvent()
 {
   Size = new Size(300,200);
   Paint += new PaintEventHandler(PaintHandler);
 }
 static void Main() 
 {
   Application.Run(new FormPaintEvent());
 }
 private void PaintHandler(object sender, PaintEventArgs e)
 {
   Graphics g = e.Graphics;
   g.DrawString("www.nfex.ru", Font, Brushes.Black, 50, 75);
 }

}</source>

Override Paint method for Form

<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class FormPaintOverride : Form {

 public FormPaintOverride()
 {
       Text = "Paint Demonstration";
   Size = new Size(300,200);
 }
 static void Main() 
 {
   Application.Run(new FormPaintOverride());
 }
 protected override void OnPaint(PaintEventArgs e)
 {
   base.OnPaint(e);
   Graphics g = e.Graphics;
   g.DrawString("www.nfex.ru", Font, Brushes.Black, 50, 75);
 }

}</source>

Paint Invalidate Demonstration

<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class PaintInvalidate : Form {

 private Button btn;
 public PaintInvalidate()
 {
   Size = new Size(300,200);
   btn = new Button();
   btn.Parent = this;
   btn.Location = new Point(25,25);
   btn.Text = "Update";
   btn.Click += new System.EventHandler(btn_Click);
 }
 static void Main() 
 {
   Application.Run(new PaintInvalidate());
 }
 protected override void OnPaint(PaintEventArgs e)
 {
   base.OnPaint(e);
   Graphics g = e.Graphics;
   String str = "\nThe time is " + DateTime.Now.ToLongTimeString();
   g.DrawString(str, Font, Brushes.Black, 50, 75);
 }
 private void btn_Click(object sender, EventArgs e)
 {
   Invalidate();
 }

}</source>