A map of attribute name/value pairs, one for each attribute. Only the primary key attributes are required; you can optionally provide other
            attribute name-value pairs for the item. If you specify any attributes that are part of an index key, then the data types for those
            attributes must match those of the schema in the table's attribute definition. For more information about primary keys, see Primary Key in the Amazon
            DynamoDB Developer Guide. Each element in the Item map is an AttributeValue object.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Dictionary<string, AttributeValue> Item { get; set; }