i've been trying to stop a workflow programmatically.
I've read both in various posts and in the msdn that this can be done by updating
the Asyncoperation status via update request.
However everytime i update the request. the workflow get stuck on a mid stage such as cancelling or pausing and dosen't reach a final state. 

any ideas?

```
protected void ExecutePostAccountUpdate(LocalPluginContext localContext)
    {
        if (localContext == null)
        {
            throw new ArgumentNullException("localContext");
        }

        string fetchXML = "<fetch mapping='logical' count='50' version='1.0'>" +
                          "<entity name='asyncoperation'>" +
                          "<filter>" +
                          "<condition attribute='regardingobjectid' operator='eq' value='" +
                          localContext.PluginExecutionContext.PrimaryEntityId + "' />" +
                          "</filter>" +
                          "</entity>" +
                          "</fetch>";
        EntityCollection col = localContext.OrganizationService.RetrieveMultiple(new FetchExpression(fetchXML));
        if (col.Entities.Count > 0)
        {
            AsyncOperation a = (AsyncOperation)col[0];
            a.StateCode = AsyncOperationState.Completed;
            a.StatusCode = new OptionSetValue(32);
            localContext.OrganizationService.Update(a);

        }

    }

```