using System;

public class Program

{

    public static void Main()

    {

         string myString = "This is great Monday";

​

            Console.WriteLine(myString.Remove(7, 6));

            Console.WriteLine(myRemove(myString, 7, 6));

    }

    static string myRemove(string myString, int pos, int deleteCount)

        {

            //string firstPart = myString.Substring(0, pos);

            string firstPart = "";

            for(int i = 0; i < pos; i++)

            {

                firstPart += myString[i];

            }

​

            //string secondPart = myString.Substring(pos + deleteCount);

            string secondPart = "";

            for(int i = pos + deleteCount; i < myString.Length; i++)

            {

                secondPart += myString[i];

            }

​

            return String.Concat(

                  firstPart,

                  secondPart

             );

        }

}