Can I access more than one table via the same DataContext object simultaneously?

Suppose I have a DataContext object and access two tables at the same time:

using( var context = new DataContext( connectionString ) ) {
     foreach( firstTableEntry in context.GetTable<FirstTable>() ) {
         switch( firstTableEntry.Type ) {
         case RequiresSecondTableAccess:
         {
             var secondTable = context.GetTable<SecondTable>();
             var items = secondTable.Where( item => item.Id = firstTableEntry.SecondId );
             foreach( var item in items ) {
                handleItem( item );
             }
         }
         default:
           // not accessing the second table
     }
}

Note that I don't stop using the first query results while making queries to the other table and use the same DataContext object all the time.

Is such usage legal? Should I expect any problems with this approach?