Is there any way to set the DefaultValue of a QueryStringParameter to some kind of wild card that will allow all records for that field to be selected?
<asp:LinqDataSource ID="dsParticipant" ContextTypeName="TOPS.Entities.pdtrainingDataContext" TableName="vw_Admin_dcParticipantEmails"
Where="Convert.ToString(qcid).Contains(@qcid) && Convert.ToString(scheduleid).Contains(@scheduleid) && Convert.ToString(schedulecourseid).Contains(@schedulecourseid) && scheduledate >= @scheduledate && scheduledate <= DATEADD(day,1,@scheduledate2) &&
(quotestatus == 5 || quotestatus == 6)"
runat="server">
<WhereParameters>
<asp:ControlParameter ControlID="ddlCourse" Name="schedulecourseid" PropertyName="SelectedValue" Type="String&quo ...
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