vb.net - Sort blank entries to bottom of LINQ query -

I am trying to sort the SQL query with LINQ based on two fields. The first area is sometimes a tap that automatically goes to the top of an ascending query. Is there any way to make Zero entries like that?

Here's an example:

  SampleDataContact.Exchange x to x command, x.Sequence_Number _x.Date, x.Sequence_Number  
 
 
 
 
  
 12/2/09, 5  
 
 
 12/3/09, 2    
 Desired order:  
 
 12/2/09, 5  
 12 / 3/09, 2  
 12/3/09, 3  
 Zero, 1  
 NULL, 4    
 
 If they are string:  
 by  order (string.IsNullOrEmpty (x.Date)? " Zzzzzz ": x.Date)  
 
 If they are spaces: 
 
  to order (x. Date? Datetime.maxvalue)