Trigger Custom Action using c#

// Calling the Action - new_EnquiryCreateProject
OrganizationRequest req = new OrganizationRequest("new_EnquiryCreateProject");
req["ProjectName"] = "This is a test operation for using Actions in CRM 2013 ";
req["Target"] = new EntityReference("new_enquiry", enquiryObj.Id);

//execute the request
OrganizationResponse response = service.Execute(req);