validator

Program.cs

@@ -4,7 +4,7 @@ class ATMAPP
     static void Main(string[] arrgs)
     {
         AppScreen.Welcome();
-        string cardNumber = Utility.GetUserInput("your Card number");
+        long cardNumber = Validator.Convert<long>("Your card number ");
         Console.WriteLine($"your name is {cardNumber}");
 
         Utility.PressEnterToContinue();

Validator.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.ComponentModel;
+
+public static class Validator
+{
+    public static T Convert<T>(string prompt)
+    {
+        bool valid = false;
+        string userInput;
+
+        while (!valid)
+        {
+            userInput = Utility.GetUserInput(prompt);
+
+            try
+            {
+                var converter = TypeDescriptor.GetConverter(typeof(T));
+                if (converter != null)
+                {
+                    return (T)converter.ConvertFromString(userInput);
+                }
+                else
+                {
+                    return default;
+                }
+            }
+            catch
+            {
+                Console.WriteLine("Invalid Input. Try again");
+            }
+        }
+        return default;
+    }
+}

obj/Debug/net6.0/c#.csproj.CoreCompileInputs.cache

@@ -1 +1 @@
-e9dd098962fb844da76e7050def142db1ae72c5e
+fa7ed969837a56ed2de2c707dd406110e19f0359