private void bOK_Click(object sender, EventArgs e) { string room; if (this.rbNew.Checked) { room = this.tbRoom.Text; } else if (this.rbExisting.Checked) { room = this.cbRoomList.Text; } else throw new Exception("Radio buttons dont work"); if (chatClient.performJoinRoom(room, this.tbPass.Text)) { var chatForm1 = new ChatForm(this.chatClient, room); chatForm1.Show(); this.Close(); } else MessageBox.Show("Can't enter room:\n Probably invalid password"); }