Adding source files.

Game1.cs

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+#region Using Statements
+using System;
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+using Microsoft.Xna.Framework.Storage;
+using Microsoft.Xna.Framework.GamerServices;
+using System.Diagnostics;
+#endregion
+
+namespace MonoGameSaveManager
+{
+    /// <summary>
+    /// A basic game to test out the SaveManager functionality.
+    /// Just follow along with the comments.
+    /// </summary>
+    public class Game1 : Game
+    {
+        GraphicsDeviceManager graphics;
+        SpriteBatch spriteBatch;
+
+        SaveManager save;
+        bool saved = false;
+
+        public Game1()
+            : base()
+        {
+            graphics = new GraphicsDeviceManager(this);
+            Content.RootDirectory = "Content";
+
+            string saveFolder = "SaveManagerTest"; // put your save folder name here
+            string saveFile = "test.sav"; // put your save file name here
+
+            // Pick one:
+
+            // - this will use the XNA StorageDevice method.
+            save = new StorageDeviceSaveManager(saveFolder, saveFile, PlayerIndex.One);
+
+            // - this will use the .NET IsolatedStorage method.
+            //save = new IsolatedStorageSaveManager(saveFolder, saveFile);
+        }
+
+        /// <summary>
+        /// Allows the game to perform any initialization it needs to before starting to run.
+        /// This is where it can query for any required services and load any non-graphic
+        /// related content.  Calling base.Initialize will enumerate through any components
+        /// and initialize them as well.
+        /// </summary>
+        protected override void Initialize()
+        {
+            // TODO: Add your initialization logic here
+
+            base.Initialize();
+        }
+
+        /// <summary>
+        /// LoadContent will be called once per game and is the place to load
+        /// all of your content.
+        /// </summary>
+        protected override void LoadContent()
+        {
+            // Create a new SpriteBatch, which can be used to draw textures.
+            spriteBatch = new SpriteBatch(GraphicsDevice);
+
+            // TODO: use this.Content to load your game content here
+        }
+
+        /// <summary>
+        /// UnloadContent will be called once per game and is the place to unload
+        /// all content.
+        /// </summary>
+        protected override void UnloadContent()
+        {
+            // TODO: Unload any non ContentManager content here
+        }
+
+        /// <summary>
+        /// Allows the game to run logic such as updating the world,
+        /// checking for collisions, gathering input, and playing audio.
+        /// </summary>
+        /// <param name="gameTime">Provides a snapshot of timing values.</param>
+        protected override void Update(GameTime gameTime)
+        {
+            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
+                Exit();
+
+            // test save stuff
+            // since this is Update, i don't want it to keep saving every tick
+            if (!saved)
+            {
+                saved = true;
+
+                // let's make up some save data
+                save.Data.testInt = 434;
+                save.Data.testBool = false;
+                save.Data.testString = "wow a test";
+
+                // save it
+                save.Save();
+
+                // erase data so we can check if loading works
+                save.Data = new SaveData();
+
+                // load it back
+                save.Load();
+
+                // did it work? let's hope so!
+                // this will show up in Visual Studio's Output window when running.
+                // you can also just use a Breakpoint or whatever.
+                Debug.WriteLine("final save data:");
+                Debug.WriteLine("testInt = " + save.Data.testInt);
+                Debug.WriteLine("testBool = " + save.Data.testBool);
+                Debug.WriteLine("testString = " + save.Data.testString);
+            }
+
+            base.Update(gameTime);
+        }
+
+        /// <summary>
+        /// This is called when the game should draw itself.
+        /// </summary>
+        /// <param name="gameTime">Provides a snapshot of timing values.</param>
+        protected override void Draw(GameTime gameTime)
+        {
+            GraphicsDevice.Clear(Color.CornflowerBlue);
+
+            // TODO: Add your drawing code here
+
+            base.Draw(gameTime);
+        }
+    }
+}

IsolatedStorageSaveManager.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.IO.IsolatedStorage;
+using System.Linq;
+using System.Text;
+using System.Xml.Serialization;
+
+namespace MonoGameSaveManager
+{
+    /// <summary>
+    /// Uses the .NET IsolatedStorage to load/save game data.
+    /// Saves end up on "C:\Users\...\AppData\Local\IsolatedStorage\..." on Windows. 
+    /// </summary>
+    public class IsolatedStorageSaveManager : SaveManager
+    {
+        /// <summary>
+        /// /// <summary>
+        /// Creates a new save game manager based on .NET IsolatedStorage.
+        /// </summary>
+        /// <param name="folderName">Name of the folder containing the save.</param>
+        /// <param name="fileName">Name of the save file.</param>
+        public IsolatedStorageSaveManager(string folderName, string fileName)
+            : base(folderName, fileName)
+        { }
+
+        public override void Load()
+        {
+            using (IsolatedStorageFile isf = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null))
+            {
+                // Ignore if directory doesn't exist.
+                if (!isf.DirectoryExists(folderName))
+                    return;
+
+                string filePath = Path.Combine(folderName, fileName);
+
+                // Ignore if save doesn't exist.
+                if (!isf.FileExists(filePath))
+                    return;
+
+                // Open the save file.
+                using (IsolatedStorageFileStream stream = isf.OpenFile(filePath, FileMode.Open))
+                {
+                    // Get the XML data from the stream and convert it to object.
+                    XmlSerializer serializer = new XmlSerializer(typeof(SaveData));
+                    Data = (SaveData)serializer.Deserialize(stream);
+                }
+            }
+        }
+
+        public override void Save()
+        {
+            using (IsolatedStorageFile isf = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null))
+            {
+                // Create directory if it doesn't exist.
+                if (!isf.DirectoryExists(folderName))
+                    isf.CreateDirectory(folderName);
+
+                string filePath = Path.Combine(folderName, fileName);
+
+                // Create new save file.
+                using (IsolatedStorageFileStream stream = isf.CreateFile(filePath))
+                {
+                    // Convert the object to XML data and put it in the stream.
+                    XmlSerializer serializer = new XmlSerializer(typeof(SaveData));
+                    serializer.Serialize(stream, Data);
+                }
+            }
+        }
+    }
+}

SaveData.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MonoGameSaveManager
+{
+    /// <summary>
+    /// Container for your save game data.
+    /// Put the variables you need here, as long as it's serializable.
+    /// </summary>
+    [Serializable]
+    public class SaveData
+    {
+        public int testInt;
+        public bool testBool;
+        public string testString;
+    }
+}

SaveManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MonoGameSaveManager
+{
+    /// <summary>
+    /// Manages a save file for you.
+    /// </summary>
+    public abstract class SaveManager
+    {
+        protected string folderName, fileName;
+
+        /// <summary>
+        /// Access save game data.
+        /// </summary>
+        public SaveData Data { get; set; }
+
+        /// <summary>
+        /// Creates a new save game manager.
+        /// </summary>
+        /// <param name="folderName">Name of the folder containing the save.</param>
+        /// <param name="fileName">Name of the save file.</param>
+        public SaveManager(string folderName, string fileName)
+        {
+            this.folderName = folderName;
+            this.fileName = fileName;
+            this.Data = new SaveData();
+        }
+
+        /// <summary>
+        /// Loads the data from disk to memory.
+        /// </summary>
+        public abstract void Load();
+
+        /// <summary>
+        /// Saves the data in memory to disk.
+        /// </summary>
+        public abstract void Save();
+    }
+}

StorageDeviceSaveManager.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Storage;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Xml.Serialization;
+
+namespace MonoGameSaveManager
+{
+    /// <summary>
+    /// Uses the XNA StorageDevice to load/save game data.
+    /// Saves end up on "C:\Users\...\Documents\SavedGames\..." on Windows. 
+    /// </summary>
+    public class StorageDeviceSaveManager : SaveManager
+    {
+        private PlayerIndex? player;
+
+        /// <summary>
+        /// Creates a new save game manager based on XNA StorageDevice.
+        /// </summary>
+        /// <param name="folderName">Name of the folder containing the save.</param>
+        /// <param name="fileName">Name of the save file.</param>
+        /// <param name="player">Player the save belongs to, or null for a global save.</param>
+        public StorageDeviceSaveManager(string folderName, string fileName, PlayerIndex? player)
+            : base(folderName, fileName)
+        {
+            this.player = player;
+        }
+
+        private StorageDevice getStorageDevice()
+        {
+            IAsyncResult result;
+            // Get a global folder.
+            if (player == null)
+                result = StorageDevice.BeginShowSelector(null, null);
+            // Get a player-specific subfolder.
+            else
+                result = StorageDevice.BeginShowSelector((PlayerIndex)player, null, null);
+
+            result.AsyncWaitHandle.WaitOne();
+            StorageDevice device = StorageDevice.EndShowSelector(result);
+            result.AsyncWaitHandle.Close();
+            return device;
+        }
+
+        public override void Load()
+        {
+            // Open a storage device.
+            StorageDevice device = getStorageDevice();
+
+            // Open a storage container.
+            IAsyncResult result = device.BeginOpenContainer(folderName, null, null);
+            result.AsyncWaitHandle.WaitOne();
+            using (StorageContainer container = device.EndOpenContainer(result))
+            {
+                result.AsyncWaitHandle.Close();
+
+                // Ignore if save doesn't exist.
+                if (!container.FileExists(fileName))
+                    return;
+
+                // Open the save file.
+                using (Stream stream = container.OpenFile(fileName, FileMode.Open))
+                {
+                    // Get the XML data from the stream and convert it to object.
+                    XmlSerializer serializer = new XmlSerializer(typeof(SaveData));
+                    Data = (SaveData)serializer.Deserialize(stream);
+                }
+            }
+        }
+
+        public override void Save()
+        {
+            // Open a storage device.
+            StorageDevice device = getStorageDevice();
+
+            // Open a storage container.
+            IAsyncResult resultStorage = device.BeginOpenContainer(folderName, null, null);
+            resultStorage.AsyncWaitHandle.WaitOne();
+            using (StorageContainer container = device.EndOpenContainer(resultStorage))
+            {
+                resultStorage.AsyncWaitHandle.Close();
+
+                // Delete old save file.
+                if (container.FileExists(fileName))
+                    container.DeleteFile(fileName);
+
+                // Create new save file.
+                using (Stream stream = container.CreateFile(fileName))
+                {
+                    // Convert the object to XML data and put it in the stream.
+                    XmlSerializer serializer = new XmlSerializer(typeof(SaveData));
+                    serializer.Serialize(stream, Data);
+                }
+            }
+        }
+    }
+}