title: button delete doesn't execute well in c#
body: <p>I'm stuck here again and i don't know where the problem come from !
  Well, i have a delete button in c# i wrote the code and everytime i execute it they show a message.box" well deleted" but when i restarted my app i find that nothing has deleted even in my database in sql server ..please tell me what's wrong with my code:</p>
  
  <pre><code> SqlConnection sqlCon = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
              SqlCommand cmd = new SqlCommand();
              SqlDataAdapter reader = new SqlDataAdapter(); 
          sqlCon.Open();
          string requete = "DELETE FROM [RECAP] where code_reseau='" + textBox1.Text + "' and gch_dep='" + comboBox2.SelectedText + "' and typ_port='" + comboBox3.SelectedText + "' and mois = " +Form3.mois+" and annee = "+Form3.annee+" ";
          cmd = new SqlCommand(requete, sqlCon);
          cmd.ExecuteNonQuery();
          MessageBox.Show("Supprimé !");
          sqlCon.Close();
  </code></pre>