Post XML from ASPX page

Hi, I am complete noobie in ASP. I have to post a XML from ASPX page to a coldfusion page. The ASPX page is a just simple survey 
How I can send using post some xml from this page?
Thank you.

Here is the code behind this ASPX page:
public partial class SatisfactionSurveys_newSurvey : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        TextBox b;
        b = (TextBox)FormView1.FindControl("EmailSentTextBox");
        b.Text = "1";
        b = (TextBox)FormView1.FindControl("EmailSentDateTextBox");
        b.Text = DateTime.Now.ToString();
    }
    protected void FormView1_DataBound(object sender, Eve ...