CrmServiceClient crmConn = new CrmServiceClient(ConfigurationManager.ConnectionStrings["CRM"].ConnectionString);
IOrganizationService crmService = crmConn.OrganizationServiceProxy;



<connectionStrings>
<add name="CRM" connectionString="AuthType=Office365;Url=https://instance.crm4.dynamics.com; Username=name.name@domain.onmicrosoft.com; Password=Lu555" />