title: c# add record to selected customer
body: <p><a href="https://i.stack.imgur.com/vjNNn.png" rel="nofollow noreferrer">home screen</a></p>
  
  <p><a href="https://i.stack.imgur.com/0MttR.png" rel="nofollow noreferrer">custumers screen</a></p>
  
  <p><a href="https://i.stack.imgur.com/1EjfB.png" rel="nofollow noreferrer">tables</a></p>
  
  <p>hi. first of all sorry my bad english.
  I want to make a technical service program. custumers part is done. but when i add device on customer i am little confused. i want to add device when i selected customer. i am using sql. i hope i can explain myself. thx</p>