using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var cur = new CultureInfo("nb-NO");

​

        var foo = "caa";

        var bar = "ca";

        if (foo.StartsWith(bar, false, cur))

        {

            Console.WriteLine(foo + " starts with " + bar);

        }

        else

        {

            Console.WriteLine(foo + " does not start with " + bar);

        }

    }

}