private void button1_Click(object sender, RoutedEventArgs e) { App app = Application.Current as App; string deviceID = app.DivceID; string ID = app.ID; int i = 0; foreach (Chat s in sc.GetAllChat()) { i = s.ChatID; } Chat addChat = new Chat(); if (sayBox.Text != "") { addChat.ChatID = (i + 1); addChat.DID = int.Parse(deviceID); addChat.UID = int.Parse(ID); addChat.Comment = sayBox.Text; sc.InsertChatDetails(addChat.ChatID, addChat.DID, addChat.UID, addChat.Comment); MessageBox.Show("Thank you for your comment!"); sayBox.Text = ""; } else { MessageBox.Show("You must say something!"); } }