using System;

public class Program

{

    public static void Main()

    {

        var from = "02000000";

        var to = "49999999";

        var docNo = "1205311";

        Console.WriteLine("Larger than? " + String.Compare(docNo, to)); // if result < 0 then string1 is less than string2

        /*

        Value   Condition

        Less than zero  The first substring precedes the second substring in the sort order.

        Zero    The substrings occur in the same position in the sort order, or length is zero.

        Greater than zero   The first substring follows the second substring in the sort order.

        */

    }

}