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