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Cancel the Workflow Through Object Model



 SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    using (SPSite osite = new SPSite(SPContext.Current.Site.ID))
                    {
                        using (SPWeb oweb = osite.OpenWeb(SPContext.Current.Web.ID))
                        {

                           
                            SPList oList= oweb.Lists["List Name"];
           SPListItem olstitem = oTravelRequestList.GetItemById(133);
                            SPWorkflowManager manager = osite.WorkflowManager;

                            foreach (SPWorkflow itemWorkflow in manager.GetItemActiveWorkflows(olstitem))
                            {
                                MainDataSource.CreateNavigator().SelectSingleNode("/my:myFields/my:txtNotes", NamespaceManager).SetValue("Title is" + manager.GetItemActiveWorkflows(olstitem).Count);
                               
                                oweb.AllowUnsafeUpdates = true;
                                itemWorkflow.CreateHistoryEvent((int)SPWorkflowHistoryEventType.WorkflowCancelled, 0, oweb.CurrentUser , "Cancelled by the User", "Cancelled By Siva", null);
                                oweb.AllowUnsafeUpdates = false;

                                if (!itemWorkflow.IsLocked)
                                {
                                    foreach (SPWorkflowTask taskWorkflow in itemWorkflow.Tasks)
                                    {

                                        taskWorkflow["Status"] = "Canceled";
                                        oweb.AllowUnsafeUpdates = true;
                                        taskWorkflow.SystemUpdate();
                                        oweb.AllowUnsafeUpdates = false;
                                    }
                                   
                                    oweb.AllowUnsafeUpdates = true;
                                    SPWorkflowManager.CancelWorkflow(itemWorkflow);
                                    oweb.AllowUnsafeUpdates = false;

                                               
                                }
                            }
                        }
                    }
                });

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