System.Net.Mail.MailMessage does not recgonize "Cc"

I have an email Form that works correctly with two addressees. The following is the TRY block:
try
{
msg = new MailMessage(txt_Email.Text,
"[email protected],[email protected]", "Registration From: " + txt_First.Text + ' ' +
txt_Last.Text,
sb.ToString());
msg.Cc.Add(txt_Email.Text);

sc.Send(msg);
Response.Redirect("confirm.aspx");
}

One of the fields in the Form is txt_Email.Text. When the Form does not contain the “msg.Cc,Add(txt_Email,Text); “ line of code, the Form works correctly. When I try to add the “msg.Cc,Add(txt_Email,Text); “ line of code I get the following error:
Compiler Error Message: CS0117: 'System.Net.Mail.MailMessage' does not contain a definition for 'Cc'
What is the problem and what is the solution?

 

Not 100% sure but I think cc and bcc are MailAddress collection types. You cant add a string. Check msdn to confirm and find a sample.