gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Android.App;
using Android.Content;
using Android.Widget;
using Android.OS;

namespace MonoDroidMultiChoice
{
    [Activity(Label = "MonoDroidMultiChoice", MainLauncher = true)]
    public class Activity1 : Activity
    {
        int count = 1;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button>(Resource.Id.MyButton);

            button.Click += new EventHandler(button_Click);
        }

        void button_Click(object sender, EventArgs e)
        {
            IEnumerable<char>[] stockItemsDisplay = new List<string>
                                                        {"option1", "option2", "option3", "fourth option", "last"}
                                                        .Select(i => i.AsEnumerable()).ToArray();
            bool[] allitemschecked = new[] {true, false, false, true, false};

            var dialog = new AlertDialog.Builder(this);
            dialog.SetMultiChoiceItems(stockItemsDisplay, allitemschecked, clickCallback);
            dialog.SetTitle("Select columns");
            dialog.SetPositiveButton("Save", saveCallback);
            dialog.Create().Show();
        }

        private void clickCallback(object sender, DialogMultiChoiceClickEventArgs e) {}
        private void saveCallback(object sender, DialogClickEventArgs e) {}
    }
}