Removing Association

 

   1: SPSite site = new SPSite("http://localhost");

   2: SPWeb web = site.OpenWeb();

   3: SPList list = web.Lists["Shared Documents"];

   4: SPWorkflowAssociation _association = null;

   5: foreach (SPWorkflowAssociation association in list.WorkflowAssociations)

   6: {

   7: if (association.Name == "Approval")

   8: {

   9: _association = association;

  10: break; 

  11: }

  12: }

  13: if(_association !=null)

  14: list.RemoveWorkflowAssociation(_association);

Adding workflow to the library

   1: SPSite site = new SPSite("http://localhost");

   2: SPWeb web = site.OpenWeb();

   3: SPList list = web.Lists["Shared Documents"];

   4: SPList taskList = web.Lists["Tasks"];

   5: SPList historyList = web.Lists["Workflow History"]; 

   6: SPWorkflowTemplate _template = null;

   7: foreach (SPWorkflowTemplate template in web.WorkflowTemplates)

   8: {

   9: if (template.Name == "Approval")

  10: {

  11: _template = template;

  12: break; 

  13: } 

  14: }

  15: SPWorkflowAssociation asso = SPWorkflowAssociation.CreateListAssociation(_template, _template.Name, taskList, historyList); 

  16: list.AddWorkflowAssociation(asso);

Starting workflow

   1: SPSite site = new SPSite("http://localhost");

   2: SPWeb web = site.OpenWeb();

   3: SPList list = web.Lists["Shared Documents"];

   4: SPWorkflowAssociation association = AddWorkflow(); // Above function to get the SPWorlflowAssociation object

   5: SPWorkflowManager manager = site.WorkflowManager; 

   6: for (int idx = 0; idx < 10 ; idx++) // I'm assuming there would be atleast 10 items within the library

   7: {

   8: SPListItem item = list.Items[idx];

   9: manager.StartWorkflow(item,association, "you can pass any data here",true);

  10: }