C#

<br />
Microsoft.Office.Tools.CustomTaskPane taskPane;<br />
Microsoft.Office.Interop.Outlook.Application applicationObject;<br />
Outlook.Explorer explorer;<br />
<br />
        private void ThisAddIn_Startup(object sender, System.EventArgs e)<br />
        {<br />
            explorer = this.Application.ActiveExplorer();<br />
<br />
            explorer.SelectionChange += new ExplorerEvents_10_SelectionChangeEventHandler(activeExplorer_SelectionChange);<br />
        }<br />
<br />
        void activeExplorer_SelectionChange()<br />
        {           <br />
<br />
            if (taskPane == null)<br />
            {<br />
                taskPane = Globals.ThisAddIn.CustomTaskPanes.Add(<br />
                  new TaskPaneControl(), "Sender Details", explorer);<br />
                taskPane.Visible = true;<br />
                taskPane.Width = 245;<br />
                return;<br />
            }<br />
<br />
            if (taskPane != null)<br />
            {<br />
                Microsoft.Office.Interop.Outlook.Selection selection = explorer.Selection;<br />
<br />
                if (selection.Count == 1 && selection[1] is      Microsoft.Office.Interop.Outlook.MailItem)<br />
                {<br />
                    Microsoft.Office.Interop.Outlook.MailItem mailitem = (Microsoft.Office.Interop.Outlook.MailItem)selection[1];<br />
<br />
                    TaskPaneControl ct = new TaskPaneControl();<br />
<br />
                    ct.ShowEmailDetails(mailitem);  <br />
                }            <br />
            }<br />
        }