WinForm中文本框自动完成

AutoCompleteStringCollection myCutomSource = new AutoCompleteStringCollection();
            myCutomSource.AddRange(new string[] { "成都市东门", "成都市北门", "成都市西门", "成都市南门" });

            this.textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
            this.textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
            this.textBox1.AutoCompleteCustomSource = myCutomSource;