using System;
public class StringExercise
{
    public static void Main()
    {
        string str; 
        int length = 0;
 
        Console.Write("Input the string : ");
        str = Console.ReadLine();
 
        foreach (char chr in str)
        {
            length += 1;
 
        }
        Console.Write("Length of the string is : {0}\n\n",length);
 
        Console.ReadLine();
    }
}

Result