[Гуревич Денис]

посмотрев в SDK статью по RetrieveAllEntities, можно состряпать такой вот метод:

 
private string GetEntityName(int EntityTypeCode)
{
            // Create an authentication token.
            CrmAuthenticationToken token = new CrmAuthenticationToken();
            token.OrganizationName = "AdventureWorksCycle";
 
            // You can use enums.cs from the SDK\Helpers folder to get the enumeration for AD Authentication.
            token.AuthenticationType = 0;
 
            // Create the metadata Web service;
            MetadataService service = new MetadataService();
            service.Url = "http://<servername>:<port>/MSCRMServices/2007/MetadataService.asmx";
            service.CrmAuthenticationTokenValue = token;
            service.Credentials = System.Net.CredentialCache.DefaultCredentials;
            service.PreAuthenticate = true;
 
            // Create the request
            RetrieveAllEntitiesRequest allEntitiesRequest = new RetrieveAllEntitiesRequest();
            allEntitiesRequest.RetrieveAsIfPublished = true;
            allEntitiesRequest.MetadataItems = MetadataItems.EntitiesOnly;
            // Execute the request
            RetrieveAllEntitiesResponse allEntitiesResponse = (RetrieveAllEntitiesResponse)service.Execute(allEntitiesRequest);
            // Iterate through the retrieved entities
            foreach (EntityMetadata entity in allEntitiesResponse.CrmMetadata)
            {
                if (entity.ObjectTypeCode.Value == EntityTypeCode)
                {
                    return entity.LogicalName;
                }
            }
            return String.Empty;
}