C#

using System.Windows.Forms;
using System.ComponentModel;

class MyForm : Form
{
   private bool stopUserFromClosingForm = true;

   public MyForm()
   {     
   }

   protected override void OnClosing(CancelEventArgs e)
   {
      if(stopUserFromClosingForm)
      {
           e.Cancel = true;
      }
   }
}

static void Run()
{
   Form myForm = new Form()
   myForm.Closing += new CancelEventHandler(this.HandleFormClose);
   myForm.Show()
}

private void HandleFormClose(object sender, CancelEventArgs e)
{
   e.Cancel = true; // stop the form closing
}

<br />
(under Tabs)<br />
private void searchClick(object sender, System.EventArgs e)<br />
{<br />
Searching s = new Searching();<br />
s.ShowDialog();<br />
MessageBox.Show(s.searchThis);<br />
s.Dispose();<br />
}<br />

private void searchClick(object sender, System.EventArgs e)
{
  using (Searching s = new Searching())
  {
    if (s.ShowDialog(this) == DialogResult.OK)
      MessageBox.Show(s.SearchThis);
  }
}

public string SearchThis;
 
private void goClick(object sender, System.EventArgs e)
{
  SearchThis = "cust";
  DialogResult = DialogResult.OK;
  Close();
}

public class PictureSelectionBox : PictureBox
{
   private Rectangle selectionRect;
   private Pen selectionPen;

   public Rectangle CurrentSelection
   { 
      get { return this.selectionRect; }
      set
      {
         this.selectionRect = value;
         this.Refresh();
      }
   }

   public Pen SelectionPen
   {
      get { return this.selectionPen; }
      set
      {
          this.selectionPen = value;
          this.Refresh();
      }
   }

   protected override void OnPaint(PaintEventArgs e)
   {
     base.OnPaint(e);

     if (this.selectionPen != null &&
         this.selectionRect.Width != 0 &&
         this.selectionRect.Height != 0)
     {
         e.Graphics.DrawRectangle(this.selectionPen, this.selectionRect);
     }
   }

   public void CommitSelection()
   {
     Graphics g = Graphics.FromImage(base.Image);
     g.DrawRectangle(this.selectionPen, this.selectionRect);
     g.Dispose();

     this.CurrentSelection = new Rectangle(0, 0, 0, 0);
     this.Refresh();
   }
}

Graphics g = this.CreateGraphics();
OnPaint(new PaintEventArgs(g, this.ClientRectangle));
g.Dispose();

First Row Differences:
1-1-05, 1-2-05 = 1 Day
1-2-05, 1-9-05 = 7 Days
1-9-05, 1-16-05 = 7 Days
1-16-05, 1-23-05 = 7 Days

Second Row Differences:
1-1-05, 1-8-05 = 7 Days
1-8-05, 1-15-05 = 7 Days
1-15-05, 1-22-05 = 7 Days
1-22-05, 1-24-05 = 2 Days

DateTime dtStart = new DateTime(2005, 1, 1);
DateTime dtEnd = new DateTime(2005, 1, 30);
DateTime dtCurrent = dtStart;

while (dtCurrent < dtEnd)
{
	double dDays;
	if (dtCurrent.DayOfWeek != DayOfWeek.Sunday)
		dDays = 6.0 - (double)dtCurrent.DayOfWeek;
	else if ((dtCurrent.Day + 6) <= dtEnd.Day)
		dDays = 6.0;
	else
		dDays = dtEnd.Day - dtCurrent.Day;

	Console.Write(dtCurrent + " - ");
	DateTime dtEndOfWeek = dtCurrent.AddDays(dDays);
	Console.WriteLine(dtEndOfWeek);
	dtCurrent = dtEndOfWeek.AddDays(1.0);
}

if(myOwn is Car)<br />
{<br />
}

if(myOwn.GetType() == typeof(Car))<br />
{<br />
}

Car c = someObject as Car;
if( c != null )
{
  // Do Car-specific stuff in here.
}

public class Foo {}
public class Goo {}
public class Test
{
  [STAThread]
  static void Main( string[] args )
  {
    Foo f = null;
    Goo g = null;
    Foo ff = new Foo();
    Goo gg = new Goo();
    Console.WriteLine( Form1.TestMeAsFoo( f ) );  // False
    Console.WriteLine( Form1.TestMeAsFoo( g ) );  // False
    Console.WriteLine( Form1.TestMeAsFoo( ff ) ); // True
    Console.WriteLine( Form1.TestMeAsFoo( gg ) ); // False
    Console.WriteLine( Form1.TestMeIsFoo( f ) );  // False
    Console.WriteLine( Form1.TestMeIsFoo( g ) );  // False
    Console.WriteLine( Form1.TestMeIsFoo( ff ) ); // True
    Console.WriteLine( Form1.TestMeIsFoo( gg ) ); // False
  }
  public static bool TestMeIsFoo( object o )
  {
    return ( o is Foo );
  }
  public static bool TestMeAsFoo( object o )
  {
    return ( o as Foo ) != null;
  }
}

My: Blog | Photos

"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious