Question

I am trying to pass a variable to a SelectCommand in SqlDataSource. I have this MyIdVal that need to be passed.

Here is the code :

<form id="form1" runat="server">

<div>
<%=MyIdVal%>
</div>
<asp:GridView ID="GridView1" runat="server" DataSourceID="myIdDataSource">
</asp:GridView>
<asp:SqlDataSource runat="server" ID="myIdDataSource" 
    ConnectionString="<%$  ConnectionStrings:myCipConnection  %>" 
    ProviderName="<%$ ConnectionStrings:myCipConnection.ProviderName %>"
    SelectCommand="SELECT * FROM books WHERE id = @MyIdVal" >   

    </asp:SqlDataSource>

</form>

The code works fine if I hardcode the id, so how this works?

Answer 1

Here’s two ways to do it.

1. Bind the Parameter value to a control
   

   <selectparameters>
       <asp:controlparameter 
               name="MyIdVal" 
               controlid="DropDownListBooks" 
               propertyname="SelectedValue"/>
   </selectparameters>
   

2 . Use the SqlDataSource.Selecting Event

protected void myIdDataSource_Selecting
    (object sender, ObjectDataSourceSelectingEventArgs e)
{
    e.InputParameters["MyIdVale"] = MyIdVal;
}