How to read XML Data in C# ?

I'm making a simple to do list and want to store the Tasks in a XML File. My XML File looks like this:

    <Task>
        <Title>Make a List</Title>
        <Description>I should make a List!</Description>
        <Done>false</Done>
    </Task>

Every Task is in the Tag which stores the Title, Description and if it's done. (First time I'm using XML)

I want to generate on FormLoad for each it should make a CheckBox with

Text = <Title> ToolTip = "<Description>" Checked = <Done>

Until now my Code looks like this:

    void MainFormLoad(object sender, EventArgs e)
    {
        var doc = XDocument.Load(Application.StartupPath + "\\tasker.xml");

        var Title       = doc.Root.Descendants().Single(d => d.Name == "Title").Value; 
        var Description = doc.Root.Descendants().Single(d => d.Name == "Description").Value; 
        var Done        = doc.Root.Descendants().Single(d => d.Name == "Done").Value; 

        MessageBox.Show(Title.ToString() + Environment.NewLine + Description.ToString() ); // Just for Testing
    }

This works great but how can I make this for more than 1 Task ?