How to show a "From" field from a contact us form while using gmail smpt host with credentials setup in web.config file?

I am trying to setup a contact us form using gmail as my smtp host, I have my username and password setup in my web.config file. When I  enter a specific email address in the "From" field of the form, it doesnt show up in my inbox. Rather, My email address is showed up as both sender and reciever. Can somebody help?  I understand that smtp.gmail.com needs to authenticate me form my userid and password (setup in web.config), but it shouldn't display my email address as the sender. While in debugging mode, I could see the value of the "From" fiield is passed to the Mail Message constructor, But in the end I see my email address as the sender.  Is there any way that this could not happen? If not then what is the best way of setting up contact us forms? how they are done in real world apps?Start Free Trial

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C# file:
protected void btnSubmit_Click(object sender, EventArgs e)
    {
        string from = txtEmail.Text;
        string body = txtComments.Text;
        MailMessage msg = new MailMessage(from, "ubaidx@gmail.com", "Customer Feedback", body);
        SmtpClient mailClient = new SmtpClient("smtp.gmail.com", 25);
         mailClient.EnableSsl = true;
        mailClient.Send(msg);
        msg.Dispose();
        Response.Write("Message has been sent");
    }
 
Web.config file:
 
<configuration>
<system.net>
    <mailSettings>
      <smtp deliveryMethod="Network">
        <network host="smtp.gmail.com" port="25" userName="ubaidx" password=""/>
        </smtp>
         </mailSettings>
          </system.net>
</configuration>