Change smtp from mail address using c#

Question

Hi,
  i am sending email using gmail smtp credentials. My problem is that, i want to use different email id and username as credentials.

    <smtp from="[e-mail]" deliveryMethod="Network">
  <network host="smtp.gmail.com" port="25" userName="[e-mail]" password="mypassword"  />
  </smtp>
   
    Now i want to show from address ("[e-mail]") in client's from address, rather than userName "[e-mail]".
   
    Would you please help me to show from address ("[e-mail]"), than userName "[e-mail]"
   
Thanks