Looking at your code the class Result is not a list which I think you are trying to call with List()? not sure..
To create a List<> you can do it multiple ways see below on a few options. Try these in your Main method.
List<string> stringList = new List<string>(); //creates a List<string> called stringList
stringList.Add("green"); //adds the value green to List<string>
Console.WriteLine("Values in stringList: ");
stringList.ForEach(Console.WriteLine); //Outputs values in List<string>
Console.WriteLine("\n"); //makes a space between lines in output
var ergIA = new List<string> {"1", "2", "red", "yellow"}; //creates List<string> called ergIA and assigned four values
Console.WriteLine("Values in ergIA List: ");
ergIA.ForEach(Console.WriteLine); //Outputs values in List<string>
Console.WriteLine("\n"); //makes a space between lines in output
Console.WriteLine("Enter value to add to List ergIA: ");
string userInput = Console.ReadLine(); //Ask for user input
ergIA.Add(userInput); //Adds user input to List<string>
Console.WriteLine("\n");
Console.WriteLine("New List<> values:");
ergIA.ForEach(Console.WriteLine);
solved A List from Property [closed]