IFRAME through ASP.NET with C#

Question

Hello Everybody

I'm sending the mail i'm receiving blank text or nothing or sometimes i got error ...................

I'm putting my code here plz have a look and suggest me the problem exists in my code

I've already taken following controls.......given below

hidden Field= txtID
IFRAME = manojTextBox

-----------------------------------------------------------
Page_Load
if(!Page.IsPostBack)
{
cmdClick.Attributes.Add("onClick","document.Form1.txtID.value=manojTextBox.document.body.innerHTML");
}

-----------------------------------------------------------

Click Event

MailMessage mail1=new MailMessage();
mail1.To="[email protected]";

mail1.From="[email protected]";

mail1.Subject="This is New Mail -2";
mail1.Priority=MailPriority.High;

mail1.BodyFormat=MailFormat.Html;
mail1.Body=Request.Form["txtID"];

try
{
SmtpMail.SmtpServer="mail.saamstesting.com";
SmtpMail.Send(mail1);
lblMsg.Text="Mail Sent Successfully";
lblMsg.ForeColor=Color.DarkBlue;

}
catch(Exception ex)
{
lblMsg.Text=ex.Message.ToString();
lblMsg.ForeColor=Color.Red;
}