title: SqlCommand INSERT INTO query does not execute
body: <p>Hello guys I have got this code:</p>
  
  <pre><code>SqlCommand scom = new SqlCommand(
                                  "INSERT INTO klient(name,surname) 
                                  values(@kname,@ksurname)", 
                                  conn);
  
  scom.Parameters.AddWithValue("@kname", kname.Text);
  scom.Parameters.AddWithValue("@ksurname", ksurname.Text);
  conn.Open();
  DataTable dt = new DataTable();
  SqlDataAdapter SDA = new SqlDataAdapter("SELECT * FROM klient", spojeni);
  SDA.Fill(dt);
  conn.Close();
  </code></pre>
  
  <p>It should insert data from textboxes: kname, ksurname, but it closes the form without showing them in MS SQL table klient</p>