Remove Duplicate Characters from a String

removeduplicate.cs

using System;
					
public class Program
{
	public static void Main()
	{
		String inputStr, resultStr = String.Empty;
		
		Console.WriteLine("Enter a string:");
		inputStr = Console.ReadLine();
		
		for(int i = 0; i < inputStr.Length; i++){
			if(!resultStr.Contains(inputStr[i]+"")){
				resultStr += inputStr[i];
			}
		}
		
		Console.WriteLine("Final String: "+resultStr);
	}
}