MSDN ms-help://MS.VSCC.2003/MS.MSDNQTR.2003APR.1033/csref/html/vcrefTheInterfaceType.htmExample
The following example demonstrates interface implementation. In this example, the interface IPoint contains the property declaration, which is responsible for setting and getting the values of the fields. The class MyPoint contains the property implementation.
// keyword_interface.cs
// Interface implementation
using System;
interface IPoint
{
// Property signatures:
int x
{
get;
set;
}

int y
{
get;
set;
}
}

class MyPoint : IPoint
{
// Fields:
private int myX;
private int myY;

// Constructor:
public MyPoint(int x, int y)
{
myX = x;
myY = y;
}

// Property implementation:
public int x
{
get
{
return myX;
}

set
{
myX = value;
}
}

public int y
{
get
{
return myY;
}
set
{
myY = value;
}
}
}
class MainClass
{
private static void PrintPoint(IPoint p)
{
Console.WriteLine("x={0}, y={1}", p.x, p.y);
}

public static void Main()
{
MyPoint p = new MyPoint(2,3);
Console.Write("My Point: ");
PrintPoint(p);
}
}
Output
My Point: x=2, y=3