从PageMethods调用业务逻辑层方法

private readonly ICatalogBLL _catalogBLL = new CatalogBLL();

protected void Page_Load(object sender, EventArgs e)
{
  if (!IsPostBack)
  {
    _catalogBLL.GetSomething();
  }
}

[WebMethod]
public static UpdateSomething(int i)
{
   //Want to do as below. But can't call it from a static method.
   _catalogBLL.UpdateSomething();
}

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