using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Program

{

    private string FixCase(string text)

    {

        string[] components = text.Split('_');

        IEnumerable<string> newComponents = components.Skip(1);

        return components.First() + string.Join("", from string name in newComponents

                                                select System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(name));

​

    }

    public void Main()

    {

        string FixedCase = FixCase("hi_guys_how_are_you Hi guys");

        Console.WriteLine(FixedCase);

    }

}