A character to group keys by. 
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string Delimiter { get; set; }
 Remarks
 Remarks
            All keys that contain the same string between 
            the prefix and the first occurrence of the delimiter are grouped under a 
            single result element in CommonPrefixes. These groups are counted as one result 
            against the max-keys limitation. These keys are not returned elsewhere in the 
            response.