C#

public interface IFoo
{
    void MyMethod(); // Interface defines one method.
}

public class FooA : IFoo
{
    public void MyMethod() { Console.WriteLine("Hello from FooA"); }
}

public class FooB : IFoo
{
    public void MyMethod() { Console.WriteLine("Hello from FooB"); }
}

class Program
{
    static void Main()
    {
        Console.WriteLine("Press 1 for FooA, press 2 for FooB:");
        ConsoleKeyInfo key = Console.ReadKey(true);            
        IFoo myFoo = null;            

        if (key.KeyChar == '1')            
        {                
            myFoo = new FooA();            
        }            
        else if (key.KeyChar == '2')            
        {                
            myFoo = new FooB();            
        }
        else
        {
            throw new InvalidOperationException("Wrong selection, you must select 1 or 2"); // Always have a watch dog.
        }

        myFoo.MyMethod(); // This prints which foo was created.
    }
}

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine((new Bar<FooA>()).ToString());
            Console.WriteLine((new Bar<FooB>()).ToString());
        }
    }

    public abstract class BaseFoo
    {
    }

    public class FooA: BaseFoo
    {
        public FooA()
        {
        }
        public override string ToString()
        {
            return "FooA";
        }
    }

    public class FooB: BaseFoo
    {
        public FooB()
        {
        }
        public override string ToString()
        {
            return "FooB";
        }
    }

    public class Bar<TFoo> where TFoo : BaseFoo, new()
    {
        TFoo tFoo = new TFoo();
        public override string ToString()
        {
            return tFoo.ToString();
        }
    }

kibromg wrote:

Thank for your response.Let me explain it a bit further

kibromg wrote:

I do not want to refresh my page i.e. every 5 seconds, i just want to refresh it ONLY on server change just like desktop applications do.

<br />
<br />
// this should select all<br />
this.txtName.SelectAll();<br />
// this should set the caret to pos 0<br />
this.txtName.SelectionStart = 0;<br />
// and this should scroll:<br />
this.txtName.ScrollToCaret();<br />

this.txtName.ScrollToCaret();<br />
this.txtName.SelectAll();

1. Within the constructor of any object that is initially loaded by the form
2. Within the Load() event of any object that is initially loaded by the form
3. Anytime the textbox is not visible