The Items which we could not successfully process in a BatchWriteItem call is returned as UnprocessedItems
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public Dictionary<string, List<WriteRequest>> UnprocessedItems { get; set; }
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public Dictionary<string, List<WriteRequest>> UnprocessedItems { get; set; }