Allow Anonymous Users to run SharePoint Workflows

The code that follows will allow you to start a workflow from an event receiver. There are a couple of reasons that you may want to do this. First, you have more control over your workflow. You can check and make sure that it's started successfully. Second, you can allow users or processes to execute workflows that couldn't otherwise. Next is how you can find your workflow's guid.

SharePoint Designer Workflow - 650F1ED3-2FEE-499D-A9A2-40BE326951C1

OOB Workflow - get the TemplateID from the url
the guid here is 19149E7D-1970-4432-B174-D88C7BF2B4008

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SharePoint;
using System.Net;
using System.Diagnostics;
using Microsoft.SharePoint.Workflow;

namespace StartWorkflow
{
    class StartWorkflowOnItemAdded : SPItemEventReceiver
    {
       // use the itemadded event to start a workflow
       public override void ItemAdded(SPItemEventProperties properties)
       {
               try
               {
                  // make sure no other events can be fired
                  DisableEventFiring();

                  // execute StartWorkflow as application pool
                  SPSecurity.RunWithElevatedPrivileges(delegate(){
                        StartWorkflow(properties);
                  });
              }
              catch (Exception ex)
              {}
              finally
             {
                 // allow other events to fire
                 EnableEventFiring();
             }
      }

      private void StartWorkflow(SPItemEventProperties properties)
      {
            using (SPSite site = new SPSite(properties.WebUrl))
            {
                using (SPWeb web = site.OpenWeb())
                {
                     try
                    {
                         SPList list = web.Lists[properties.ListId];

                         //enter your workflow Guid
                         Guid wGuid = new Guid("{}");
  
                         //get the association data
                         SPWorkflowAssociation wTemplate =
                         list.WorkflowAssociations.GetAssociationByBaseID(wGuid);

                         //start your workflow
                         site.WorkflowManager.StartWorkflow(properties.ListItem,
                         wTemplate, wTemplate.AssociationData);
                    }
                    catch (Exception ex)
                    {}
                }
            }
      }

    }
}