SqlDataSource参数化查询所有记录

 <div>
        <asp:DropDownList ID="ddlTypeid" runat="server" AutoPostBack="true">
           <asp:ListItem Value="">所有</asp:ListItem>
           <asp:ListItem Value="1">1</asp:ListItem>
           <asp:ListItem Value="2">2</asp:ListItem>
           <asp:ListItem Value="3">3</asp:ListItem>
           <asp:ListItem Value="4">4</asp:ListItem>
        </asp:DropDownList>
    </div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
        DataSourceID="SqlDataSource1">
        <Columns>
            <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" />
            <asp:BoundField DataField="TypeID" HeaderText="TypeID"
                SortExpression="TypeID" />
            <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
            <asp:BoundField DataField="AddDate" HeaderText="AddDate"
                SortExpression="AddDate" />
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="Data Source=LICHUAN-64EDE70;Initial Catalog=Tests;Integrated Security=True"
        ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM [Article] where typeid=@typeid or @typeid = -1">
           <selectparameters>
              <asp:controlparameter name="typeid" ControlID ="ddlTypeid" propertyname="SelectedValue" DefaultValue="-1"/>
          </selectparameters>
    </asp:SqlDataSource>