C# String ToLower()

public string ToLower()
public string ToLower(CultureInfo)

using System; 
    		
    public class StringExample  
    {  
        public static void Main(string[] args)  
        { 
           string s1 = "Hello C#";
           string s2 = s1.ToLower();
           Console.WriteLine(s2);
        }  
    }  

hello c#