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();                    }