Primary key of the item from which to continue an earlier scan. An earlier scan might provide this value if that scan operation was
            interrupted before scanning the entire table; either because of the result set size or the Limit parameter. The
            LastEvaluatedKey can be passed back in a new scan request to continue the operation from that point.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Key ExclusiveStartKey { get; set; }