7. Write a program to remove duplicate element ?


It will remove exist duplicate element into the given string.
Ex : Tutorial 

after the remove element Tuorial


using System;
using System.Text;
 public class Program
{
   public static void Main()
  {
       var data = "csharp-tutorial"; 
       var results = new StringBuilder();
       foreach(var val in data)
      { 
          if(results.ToString().IndexOf(val)==-1) 
         {
              results.Append(val);
         } 
   } 

        Console.Write(results);
      }
 }

Output