Error Message With SQLString

I am trying to get a sql string on an ASP.Net page to work. I want the web page to only show spa stores that have a listingtype that is equal to National.

Here's the error code that I am getting:

Compiler Error Message: BC30205: End of statement expected.

Source Error:

Line 33:      
Line 34:              'Add Order By 
Line 35:              strSQL = strSQL & "where ListingType="National"
Line 36: 			 strSQL = strSQL & " Order By SpaStoreName" 

Here's my code:

              'Start SQL statement
              strSQL = "Select * From SpaStore"
    
              'Add Order By
              strSQL = strSQL & "where ListingType="National"    strSQL = strSQL & " Order By SpaStoreName"

I also tried 'National'" and '"National"'", but they didn't work.