using System;
 
public class Test
{
	public static void Main()
	{
		string mystring = "A,B,C,D";
                string[] array = mystring.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
                string newstring = "";
                foreach (var item in array)
                {
                    newstring += "'" + item + "',";
                }
                newstring = newstring.Remove(newstring.Length - 1);
                Console.WriteLine(newstring);
	}
}

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