请教高手 Combox绑定问题??

this.酒店房号comboBox.DataSource=MydateTable;
            this.酒店房号comboBox.DisplayMember="房号";
怎样清除      "   酒店房号comboBox     "            这样的绑啊?
请各位高手帮帮忙!
                                                      谢谢!

for (int x = 1; x <= Convert.ToInt32(Over.Tables["ds"].Rows.Count.ToString())/Convert.ToInt32(textBox4.Text.Trim())+1; x++)
                    {
                        comboBox1.Items.Add(x);
                    }