Configure SqldataSource With Null Date Values

I am attempting to create search parameters for a gridview control and I am experiencing a small issue. When I get to a date parameter I am unable to display null values.

I setup a sqldatasource and created the parameters below to handle the selections for minimum date required and the maximum date required for the date columns in the database. The problem is I do not know how to display null dates.

Is there a way to incorporate something into the search page to show null dataes? 

   

Sql Where Clause  1 WHERE (LSS_Requests.TypeCode = @TypeCode) AND (LSS_Requests.PersonNo LIKE '%' + @PersonNo + '%') AND
2 (LSS_Requests.TicketNo LIKE '%' + @TicketNo + '%') AND (LSS_Requests.Name LIKE '%' + @Name + '%') AND
3 (LSS_Requests.RequestName LIKE '%' + @RequestName + '%') AND (LSS_Requests.RequiredDate >= @Fromrequireddate) AND
4 (LSS_Requests.RequiredDate <= @ToRequiredDate) AND (LSS_Requests.OriginationDate >= @SearchFromOriginationDate) AND
5 (LSS_Requests.OriginationDate <= @SearchToOriginationDate) AND (LSS_Requests.LastUpdated >= @SearchFromUpdatedDate) AND
6 (LSS_Requests.LastUpdated <= @SearchUpdatedToDate) AND (LSS_Users_1.userFullName LIKE @SearchDDLUsers) AND
7 (LSS_Users.userFullName LIKE @SearchddlCIAsignee) AND (LSS_Requests.TypeCode = 'CC') AND (LSS_lu_Status.stNm LIKE '%' + @StatusName + '%')