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This is a C# code example of a Outlook 2010 Add-in Options Dialog.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using Outlook = Microsoft.Office.Interop.Outlook;
using System.Text.RegularExpressions;
namespace ChadSytelineOutlookAddIn
{
    [ComVisible(true)]
    public partial class ChadAddinOptions : UserControl, Outlook.PropertyPage
    {
        const int captionDispID = -518;
        bool isDirty = false;
        private Outlook.PropertyPageSite propertyPageSite = null;
        public ChadAddinOptions()
        {
            InitializeComponent();
        }
        void Outlook.PropertyPage.Apply()
        {
             Globals.ThisAddIn.SytelineUsername = tbUsername.Text;
             Globals.ThisAddIn.SytelineSavePath = tbSavePath.Text;
        }
        bool Outlook.PropertyPage.Dirty
        {
            get
            {
                return isDirty;
            }
        }
        void Outlook.PropertyPage.GetPageInfo(ref string helpFile, ref int helpContext)
        {
        }
        [DispId(captionDispID)]
        public string PageCaption
        {
            get
            {
                return "Chad Syteline Outlook Add-in";
            }
        }
        private void tbUsername_TextChanged(object sender, EventArgs e)
        {
            isDirty = true;
            propertyPageSite.OnStatusChange();
        }
        private Outlook.PropertyPageSite GetPropertyPageSite()
        {
            Type myType = typeof(System.Object);
            string assembly = Regex.Replace(myType.Assembly.CodeBase, "mscorlib.dll", "System.Windows.Forms.dll");
            assembly = System.Text.RegularExpressions.Regex.Replace(assembly, "file:///", "");
            assembly = System.Reflection.AssemblyName.GetAssemblyName(assembly).FullName;
            Type unmanaged = Type.GetType(System.Reflection.Assembly.CreateQualifiedName(assembly, "System.Windows.Forms.UnsafeNativeMethods"));
            Type oleObj = unmanaged.GetNestedType("IOleObject");
            System.Reflection.MethodInfo mi = oleObj.GetMethod("GetClientSite");
            object myppSite = mi.Invoke(this, null);
            return (Outlook.PropertyPageSite)myppSite;
        }
        private void ChadAddinOptions_Load(object sender, EventArgs e)
        {
            propertyPageSite = GetPropertyPageSite();
            tbUsername.Text = Globals.ThisAddIn.SytelineUsername;
            tbSavePath.Text = Globals.ThisAddIn.SytelineSavePath;
        }
    }
}