Example
Information about the item workflow is stored in the "Workflow" field.
var workflow = Factory.GetDatabase("master").WorkflowProvider.GetWorkflow(workflowId);
workflow.Start(item);
var workflowId = item.Fields["__Default workflow"].Value;
var workflow = Factory.GetDatabase("master").WorkflowProvider.GetWorkflow(workflowId);
workflow.Start(item);
