ASP.NET中通过文本框的输入实现"拼音码"动态查询的效果

HTML核心代码如下:

                  <asp:TextBox ID="TextBox1" runat="server" Style="position: relative" Width="200px"
                     AutoPostBack="true" OnTextChanged="TextBox1_Changed"></asp:TextBox>
                    <asp:Button ID="Button1" runat="server" Style="left: 400px; position: relative; top: 0px"
                        Text="查询" OnClick="Button1_Click" />
                    <asp:DropDownList ID="DropDownList1" runat="server"  Style="position: relative" Width="200px"
                     CausesValidation="True" DataTextField="课程名称">
                    </asp:DropDownList></td>

C#核心代码如下:

                    protected void TextBox1_Changed(object sender, EventArgs e)
                  {
                          SqlDataSource2.SelectCommand = "SELECT 课程名称 FROM course WHERE pinyima LIKE '"+TextBox1.Text+"%'";
                         DropDownList1.DataSource = SqlDataSource2;
                          DropDownList1.DataBind();
                         DropDownList1.Dispose();
                   }