Create an Event Receiver to start Nintex Workflow

public override void ItemUpdating(SPItemEventProperties properties)
 {
SPWorkflowManager WfManager = properties.ListItem.ParentList.ParentWeb.Site.WorkflowManager;
SPWorkflowAssociationCollection wfAssociationCollection = properties.ListItem.ParentList.WorkflowAssociations;
SPWorkflowAssociation wfAssociation = wfAssociationCollection.GetAssociationByName("HistoricalDataAudit", System.Threading.Thread.CurrentThread.CurrentCulture);
 
foreach (SPWorkflowAssociation wfAssociationCollectionItem in wfAssociationCollection)
{
  WfManager.StartWorkflow(properties.ListItem, wfAssociationCollectionItem,"");
}