C# 仿百度自动匹配

private void Form1_Load(object sender, EventArgs e)
        {
            AutoCompleteStringCollection source = new AutoCompleteStringCollection();
            source.AddRange(new string[]
                    {
                        "January",
                        "February",
                        "March",
                        "April",
                        "May",
                        "June",
                        "July",
                        "August",
                        "September",
                        "October",
                        "November",
                        "December"
                    });  

            TextBox textBox = new TextBox();  

            textBox.AutoCompleteCustomSource = source;
            textBox.AutoCompleteMode =
                AutoCompleteMode.SuggestAppend;
            textBox.AutoCompleteSource =
                AutoCompleteSource.CustomSource;
            textBox.Location = new Point(20, 20);
            textBox.Width = ClientRectangle.Width - 40;
            textBox.Visible = true;  

            Controls.Add(textBox);
            //comboBox1.DropDownHeight = 300;  

        }