Primary key of the item where the query operation stopped, inclusive of the previous result set. Use this value to start a new operation
            excluding this value in the new request. The LastEvaluatedKey is null when the entire query result set is complete (i.e. the
            operation processed the "last page").
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Key LastEvaluatedKey { get; set; }