working from win form

I have a question.

In the form when pressing the button, the workflow starts

I wrote the following code in the button1_click event. I have used a my service for work with handle external method and callexternalevent activities

Is this correct

private void Button1_Click(object sender, EventArgs e)

if (wr != null)

wr = new WorkflowRuntime();

WorkflowInstance wi = wr.CreateWorkflow(typeof(WFizin.izinWorkflow));