using System;

public class Program

{

    public static void Main()

    {

        newControl control=new newControl();

        Console.WriteLine(control.GetSeqnumber("myKey","12345"));

        Console.WriteLine(control.GetSeqnumber2("myKey","12345"));

    }

}

​

public class baseControl

{

    public virtual string GetSeqnumber(string key,string sernoId)

    {

        return String.Format("{0}-{1}",key,sernoId);

    }

    public string GetSeqnumber2(string key, string sernoId)

    {

        return String.Format("GetSeqNo2{0}{1}",key,sernoId);

    }

}

​

public class newControl:baseControl

{

    public override string GetSeqnumber(string key, string sernoId)

    {

        return String.Format("New Control {1}-{0}",key,sernoId);

    }

    public new string GetSeqnumber2(string key,string sernoId)

    {

        return String.Format("New Control GetSeqno2 {0}{1}",key,sernoId);

    }

}

​

​