C#

<br />
int _x = 10;<br />
int _y = 10;<br />
int _width = 100;<br />
int _height = 100;<br />
int _angle = 45;<br />
...<br />
...<br />
...<br />
private void buttonclicked( object sender System.EventArgs e )<br />
{<br />
  _angle = ( _angle == 360 ) ? 0 ? _angle + 1;<br />
  this.Refresh();<br />
}<br />
<br />
<br />
private void FormPaint( object sender, PaintEventArgs e )<br />
{<br />
  Graphics g = e.Graphics;<br />
  Matrix matrix = new Matrix();<br />
  matrix.Rotate( _angle );<br />
  g.Transform = matrix;<br />
  g.DrawRectangle( Pens.Black, _x, _y, _width, _height );<br />
}<br />

private string ParseWildCards(string strWild)
{
	// Look for wildcards that DO NOT occur at the start or end of the string
	Regex reg = new Regex(@"(?<=.)\*(?=.)");
	if (reg.IsMatch(strWild))
	{
		// We have a wildcard in the middle of the expression - check this is actually a LIKE - else it won't work
		int i = strWild.IndexOf("LIKE");
		if (i > 0)		
		{
			string col = strWild.Substring(0,i).Trim();	// get the column name
			string strReplace = "*' AND " + col + " LIKE '*";
			return reg.Replace(strWild,strReplace);
		}
	}
	return strWild;
}

using System.Collections.Generic;
...
List< Person > persons = new List< Person >();
persons.Add(somePerson);
persons.Add(5); // compile-time error: persons can only contain Person objects. This is something ArrayList will NOT give you, hence the benefit of using List

public struct MyStruct
{
   public int x;
   public int y;
   public float z;
}

IntPtr p;
MyStruct s;
int size;
byte[] buffer;

s = new MyStruct();

s.x = 1;
s.y = 2;
s.z = 3.0f;

size = sizeof( typeof( MyStruct ) );

p = Marshal.AllocHGlobal( size );

Marshal.PtrToStructure( s, p, true );
buffer = new byte[ size ];

Marshal.Copy( p, buffer, 0, size );

Marshal.FreeHGlobal( p );