<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>