added error message if player choses something other than rock paper …

RPSWithErrorMessages/Program.cs

@@ -0,0 +1,80 @@
+using System;
+
+namespace RockPaperScissors
+{
+    class Program
+    {
+        public static void Main()
+        {
+            //asks for user input
+            Console.WriteLine("Enter your move:");
+            string hand1 = Console.ReadLine().ToLower();
+
+            //if player enters invalid hand, throws exception and asks for valid input
+            while(hand1 != "rock"&&hand1 != "paper"&&hand1 != "scissors"){
+                try{
+
+                    if (hand1 != "rock"&&hand1 != "paper"&&hand1 != "scissors")
+                    {
+                        throw new Exception ("Invalid move");
+                    }
+                }
+                catch(Exception) {
+
+                    Console.WriteLine("Invalid move entered please try again");
+                    hand1 = Console.ReadLine().ToLower();
+                }
+            }
+            Console.WriteLine(outcome(compareHands(hand1,hand2())));
+            //prevents program from closing
+            Console.ReadLine();
+        }
+        public static string hand2()
+        {
+            //random computer input
+            Random rnd = new Random();
+            int computerMove = rnd.Next(1,4);
+
+            if (computerMove == 1){
+                Console.WriteLine("Computer chose rock");
+                return "rock";
+            }
+            else if (computerMove == 2){
+                Console.WriteLine("Computer chose paper");
+                return "paper";
+            }
+            else{
+                Console.WriteLine("Computer chose scissors");
+                return "scissors";
+            }
+        }
+        public static int compareHands(string hand1, string hand2)
+        {
+            //Tie condition
+            if(hand1 == hand2){
+                return 0;
+            }
+            //Win Condition
+            else if ((hand1 == "rock" && hand2 == "scissors")||(hand1 == "paper" && hand2 == "rock")||(hand1 == "scissors" && hand2 == "paper")){
+                return 1;
+            }
+            //Loss Condition
+            else{
+                return 2;
+            }
+        }
+        public static string outcome(int compareHands)
+        {
+            //logic to decide outcome
+            if(compareHands == 0){
+                return "it's a Tie!";
+            }
+            else if(compareHands == 1){
+               return "You Win!";
+            }
+            else{
+               return "You Lose!";
+            }
+        }   
+    }
+}

RPSWithErrorMessages/RPSWithErrorMessages.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>