The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the
            previous operation. The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed. In a
            parallel scan, a Scan request that includes ExclusiveStartKey must specify the same segment whose previous Scan
            returned the corresponding value of LastEvaluatedKey.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Dictionary<string, AttributeValue> ExclusiveStartKey { get; set; }