public Task <string> GetStringValueQueryAsync(byte[] key, BlockParameter blockParameter = null)
        {
            var getStringValueFunction = new GetStringValueFunction();

            getStringValueFunction.Key = key;

            return(ContractHandler.QueryAsync <GetStringValueFunction, string>(getStringValueFunction, blockParameter));
        }
 public Task <string> GetStringValueQueryAsync(GetStringValueFunction getStringValueFunction, BlockParameter blockParameter = null)
 {
     return(ContractHandler.QueryAsync <GetStringValueFunction, string>(getStringValueFunction, blockParameter));
 }