/// <summary>
/// Get Date modified value of a specified resource.
/// </summary>
/// <param name="memberResourceId">Id of resource to get modified date.</param>
/// <returns>Returns NULL if resource does not exists.
/// Returns minimum date value if resource's modified date is empty in data store.</returns>
private static DateTime?GetModifiedDate(string memberResourceId)
{
using (ZentityContext context = CoreHelper.CreateZentityContext())
{
Guid resourceId = new Guid(memberResourceId);
return(context.ScholarlyWorks()
.Where(resource => resource.Id == resourceId)
.AsEnumerable()
.Select(resource => (null == resource) ? null :
(null == resource.DateModified) ? DateTime.MinValue : resource.DateModified)
.FirstOrDefault());
}
}