Initial commit

.gitignore

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+/.vs
+/bin
+/obj

Activities.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Activities.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.9.34701.34
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Activities", "Activities.csproj", "{D81F6378-2184-4380-AF69-D03738C63DA6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{D81F6378-2184-4380-AF69-D03738C63DA6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D81F6378-2184-4380-AF69-D03738C63DA6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D81F6378-2184-4380-AF69-D03738C63DA6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D81F6378-2184-4380-AF69-D03738C63DA6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {0D40D0B7-0470-4089-948E-E14CE210C76F}
+	EndGlobalSection
+EndGlobal

Activity.cs

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+namespace Activities
+{
+    public class Activity(string title, DateOnly date, string description)
+    {
+        private readonly string title = title;
+        private readonly DateOnly date = date;
+        private readonly string description = description;
+
+        public string GetTitle()
+        {
+            return this.title;
+        }
+
+        public DateOnly GetDate()
+        {
+            return this.date;
+        }
+
+        public string GetDescription()
+        {
+            return this.description;
+        }
+    }
+}

Invitation.cs

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+namespace Activities
+{
+    public class Invitation
+    {
+        public static string GetValue(string prompt)
+        {
+            Console.Write(prompt);
+            string? value = Console.ReadLine();
+            if (value == null)
+            {
+                Console.WriteLine("No input provided.");
+                value = GetValue(prompt);
+            }
+            return value;
+        }
+
+        public static DateOnly GetDate(string prompt)
+        {
+            string value = GetValue(prompt);
+            DateOnly date;
+            try
+            {
+                date = DateOnly.Parse(value);
+            }
+            catch
+            {
+                Console.WriteLine("Invalid date provided.");
+                date = GetDate(prompt);
+            }
+            return date;
+        }
+
+        public static bool GetResponse(string prompt)
+        {
+            string value = GetValue(prompt);
+            if (value.Equals("y", StringComparison.CurrentCultureIgnoreCase))
+            {
+                return true;
+            }
+            else if (value.Equals("n", StringComparison.CurrentCultureIgnoreCase))
+            {
+                return false;
+            }
+            else
+            {
+                Console.WriteLine("Invalid response provided.");
+                return GetResponse(prompt);
+            }
+        }
+    }
+}

Person.cs

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+namespace Activities
+{
+    public class Person(string name, string email)
+    {
+        private readonly string name = name;
+        private readonly string email = email;
+
+        public string GetName()
+        {
+            return this.name;
+        }
+
+        public string GetEmail()
+        {
+            return this.email;
+        }
+    }
+}

Program.cs

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+using System.Diagnostics;
+using System;
+
+namespace Activities
+{
+    public class Program
+    {
+        static void Main()
+        {
+            Console.WriteLine("Creating a new invitation. Please enter your details.");
+            string organisorName = Invitation.GetValue("Your name: ");
+            string organisorEmail = Invitation.GetValue("Your email: ");
+            Person organisor = new(organisorName, organisorEmail);
+            Console.Clear();
+            Console.WriteLine("Enter activity details.");
+            string activityTitle = Invitation.GetValue("Activity title: ");
+            DateOnly activityDate = Invitation.GetDate("Activity date (DD/MM/YYYY): ");
+            string activityDescription = Invitation.GetValue("Activity description: ");
+            Activity activity = new(activityTitle, activityDate, activityDescription);
+            Console.Clear();
+            List<Person> invitees = [];
+            bool addInvitee = true;
+            while (addInvitee)
+            {
+                Console.WriteLine("Enter invitee details.");
+                string inviteeName = Invitation.GetValue("Invitee name: ");
+                string inviteeEmail = Invitation.GetValue("Invitee email: ");
+                Person invitee = new(inviteeName, inviteeEmail);
+                invitees.Add(invitee);
+                addInvitee = Invitation.GetResponse("Do you wish to add another invitee? (Y/N): ");
+            }
+            Console.Clear();
+            foreach (Person invitee in invitees)
+            {
+                Console.WriteLine($"Dear {invitee.GetName()}, you have been invited for \"{activity.GetTitle()}\" on {activity.GetDate()}. Description: {activity.GetDescription()}\n\nKind regards,\n{organisor.GetName()}");
+            }
+        }
+    }
+}