C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
					
public class Program
{
	public static void Main()
	{
		var myList = string.Empty;
		string str = "Narrator";
		for(var i=0;i<str.Length;i++)
		{
			var chr = str[i];
			var fstr = str.Remove(i);
			if(fstr.Contains(chr.ToString()))
			{
				if(!myList.Contains(chr.ToString()))
				{
					myList+=chr.ToString();
				}
			}
		}
		
		Console.WriteLine(myList);
	}
}

 
using System;
                    
public class Program
{
    public static void Main()
    {
        var myList = string.Empty;
        string str = "Narrator";
        for(var i=0;i<str.Length;i++)
        {
            var chr = str[i];
            var fstr = str.Remove(i);
            if(fstr.Contains(chr.ToString()))
            {
                if(!myList.Contains(chr.ToString()))
                {
                    myList+=chr.ToString();
                }
            }
        }
        
        Console.WriteLine(myList);
    }
}

isEmptyAvailable && uri != null && string.IsNullOrWhiteSpace(uri)

isEmptyAvailable == False & uri == null -> False
isEmptyAvailable == True & uri == null -> False
isEmptyAvailable == True & uri == "" -> True
isEmptyAvailable == True & uri == " " -> True
isEmptyAvailable == True & uri == text -> False

isEmptyAvailable && uri?.Trim() == string.Empty

isEmptyAvailable == True & uri == null -> False
isEmptyAvailable == True & uri == "" -> True
isEmptyAvailable == True & uri == " " -> True
isEmptyAvailable == True & uri == text -> False

Last Run:	1:01:26 pm
Compile:	0.012s
Execute:	0.05s
Memory:	2.87Mb
CPU:	0.062s

View IL Code