Csharp/CSharp Tutorial/GUI Windows Forms/Thread UI

Multithreading in Windows Forms

using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
class Program : Form
{
  private System.Windows.Forms.ProgressBar _ProgressBar;
  [STAThread]
  static void Main()
  {
      Application.Run(new Program());
  }
  public Program()
  {
      InitializeComponent();
      ThreadStart threadStart = Increment;
      threadStart.BeginInvoke(null, null);
  }
  void UpdateProgressBar()
  {
     if (_ProgressBar.InvokeRequired){
         MethodInvoker updateProgressBar = UpdateProgressBar;
         _ProgressBar.Invoke(updateProgressBar);
     }else{
         _ProgressBar.Increment(1);
     }
  }
  private void Increment()
  {
      for (int i = 0; i < 100; i++)
      {
          UpdateProgressBar();
          Thread.Sleep(100);
      }
      if (InvokeRequired)
      {
          Invoke(new MethodInvoker(Close));
      }else{
          Close();
      }
  }
  private void InitializeComponent()
  {
      _ProgressBar = new ProgressBar();
      SuspendLayout();
      _ProgressBar.Location = new Point(13, 17);
      _ProgressBar.Size = new Size(267, 19);
      ClientSize = new Size(292, 53);
      Controls.Add(this._ProgressBar);
      Text = "Multithreading in Windows Forms";
      ResumeLayout(false);
  }
}

Mutex and UI

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;
public class MutexForm : System.Windows.Forms.Form
{
  private Mutex m = new Mutex( false, "WinMutex" );
  private bool bHaveMutex = false;
  public MutexForm()
  {
    Thread T = new Thread( new ThreadStart( ThreadProc ) );
    T.Start( );
    
  }
  protected override void OnPaint( PaintEventArgs e ) {
    if( this.bHaveMutex )
      DrawCircle( System.Drawing.Color.Green );
    else
      DrawCircle( System.Drawing.Color.Red );
  }
  protected void DrawCircle( System.Drawing.Color color ) {
    using(Brush b = new SolidBrush( color )){
    using(Graphics g = this.CreateGraphics( )){
       g.FillEllipse( b, 0, 0, this.ClientSize.Width, this.ClientSize.Height );    
    }}
  }
  protected void ThreadProc( ) {
    while( true ) {
      m.WaitOne( );
      bHaveMutex = true;
      Invalidate( );
      Update( );
      Thread.Sleep( 1000 );
      m.ReleaseMutex( );
      bHaveMutex = false;
      Invalidate( );
      Update( );
    }
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new MutexForm());
  }
}