Getting SelectParameter in the OnDataBinding event

Hello
The example below is pretty simple. I'm trying to get the parameter value in
the OnDataBinding event. The problem is that the sss='param1', i.e. it is
the parameter name except of parameter value.

Sample code:
--------------------------------------------------------
<script>
void getParameter(Object sender, EventArgs e)
{
        string sss = DataBinder.Eval(dsrc1,
"SelectParameters['param1']").ToString();
}
</script>

<asp:SqlDataSource ID="dsrc1" SelectCommand="SELECT * FROM table WHERE
id=@id">
   <SelectParameters>
      <asp:Parameter Name="param1" Type="Boolean" Direction="Output"
DefaultValue="false" />
   </SelectParameters>
</asp:SqlDataSource>

<asp:FormView>
   <ItemTemplate>
      <asp:Label OnDataBinding="getParameter" />
   </ItemTemplate>
</asp:FormView>
----------------------------------------------------------

How can I get the parameter 'param1' value?

TIA
Best regards,
Artem

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