Fetch all the entity list using c#

public EntityMetadata[] GetEntities(IOrganizationService organizationService)
        {
            Dictionary<string, string> attributesData = new Dictionary<string, string>();
            RetrieveAllEntitiesRequest metaDataRequest = new RetrieveAllEntitiesRequest();
            RetrieveAllEntitiesResponse metaDataResponse = new RetrieveAllEntitiesResponse();
            metaDataRequest.EntityFilters = EntityFilters.Entity;

            XmlDictionaryReaderQuotas myReaderQuotas = new XmlDictionaryReaderQuotas();
            myReaderQuotas.MaxNameTableCharCount = 2147483647;

            // Execute the request.

            metaDataResponse = (RetrieveAllEntitiesResponse)organizationService.Execute(metaDataRequest);

            var entities = metaDataResponse.EntityMetadata;
            return entities;
        }