Add workflow association to specific list in SharePoint 207

Here is my snippet code how to create a workflow association that can then be added to a list.

/// <summary>

        /// Add workflow association to specific list

        /// </summary>

        /// <param name="siteId">Site collection object</param>

        /// <param name="webId">SharePoint website object</param>

        /// <param name="strWorkflowAssociateToListTitle">List title of SPList object will be associated workflow</param>

        /// <param name="workflowName">The name of the desired workflow association.</param>

        /// <param name="workflowId">Workflow template based on template ID</param>

        /// <param name="workflowHistoryListTitle">List title of Workflow History list</param>

        /// <param name="taskListTitle">List title of Task List</param>

        /// <param name="autoStartWorkflowCreate">A Boolean that represents whether the workflow starts 

        /// automatically when a new item is created.</param>

        public static void AssociateWorklowToList(Guid siteId, Guid webId, string strWorkflowAssociateToListTitle, string workflowName,

                 Guid workflowId, string workflowHistoryListTitle, string taskListTitle, bool autoStartWorkflowCreate)

        {

            SPSecurity.RunWithElevatedPrivileges(delegate()

            {

                using (SPSite siteCollection = new SPSite(siteId))

                {

                    siteCollection.AllowUnsafeUpdates = true;

                    using (SPWeb site = siteCollection.OpenWeb(webId))

                    {

                        bool allowUnsafeUpdates = false;

                        allowUnsafeUpdates = site.AllowUnsafeUpdates;

                        site.AllowUnsafeUpdates = true;

                        SPListCollection lists = site.Lists;

                        ////a workflow association that can then be added to a this list.

                        SPList workflowAssociateToList = lists[strWorkflowAssociateToListTitle];

                        ////workflow history list

                        SPList workflowHistoryList = lists[workflowHistoryListTitle];

                        ////task list

                        SPList taskList = lists[taskListTitle];

                        SPWorkflowAssociation 

                                existingAssociation = workflowAssociateToList.WorkflowAssociations

                                        .GetAssociationByName(workflowName, 

                                                System.Globalization.CultureInfo.CurrentCulture);

                        if (existingAssociation == null)

                        {

                            SPWorkflowManager workflowManager = siteCollection.WorkflowManager;

                            SPWorkflowTemplateCollection templates = workflowManager.GetWorkflowTemplatesByCategory(site, null);

                            SPWorkflowTemplate template = templates.GetTemplateByBaseID(workflowId);

                            SPWorkflowAssociation association = SPWorkflowAssociation.CreateListAssociation(template, workflowName, taskList, workflowHistoryList);

                            ////the key solution

                            site.Update();

                            association.AllowManual = true;

                            association.AutoStartCreate = false;

                            workflowAssociateToList.AddWorkflowAssociation(association);

                            workflowAssociateToList.Update();

                            association.Enabled = true;

                        }

                        site.AllowUnsafeUpdates = allowUnsafeUpdates;

                    }

                }

            });

        }