feedback form is not working

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C#

hi,
I have copy feedback form from this side it is running but mail is not going and it is giving"Send Email FailedThe specified string is not in the form required for an e-mail address".please give the solution of it...

using System;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Net.Mail;

public partial class _Default : System.Web.UI.Page
{
    protected void btnSendmail_Click(object sender, EventArgs e)
    {
        SmtpClient smtpClient = new SmtpClient();
        MailMessage message = new MailMessage();
        try
        {
            MailAddress fromAddress = new MailAddress(txtEmail.Text, txtName.Text);
            smtpClient.Host = "localhost";
            smtpClient.Port = 25;
            message.From = fromAddress;
            message.To.Add("teddy.shally@gmail.com");
            message.Subject = "Feedback";
            message.CC.Add("teddy.shally@gmail.com");
            message.CC.Add("agarwal.neha.0703@gmail.com.com");
            message.Bcc.Add(new MailAddress("tushargupta251@gmail.com."));
            message.Bcc.Add(new MailAddress("admin4@yoursite.com"));
            message.IsBodyHtml = false;
            message.Body = txtMessage.Text;
            smtpClient.Send(message);
            lblStatus.Text = "Email successfully sent.";
        }
        catch (Exception ex)
        {
            lblStatus.Text = "Send Email Failed" + ex.Message;
        }
    }
    
    protected void btnReset_Click(object sender, EventArgs e)
    {
      txtName.Text = "";
      txtMessage.Text = "";
      txtEmail.Text = "";
    }
}