load page with detailsview in insert mode

I have an ASP.Net page with a gridview and detailsview...when I click an item in the gridview, the detailsview is displayed and populated with the details of the selected user from the gridview....currently, when I first load the page and no user is selected from the gridview, I don't see the detailsview...how can I display the detailsv开发者_StackOverflow中文版iew in insert mode when the page is loaded...before a user has been selected from the gridview?

DetailsView1.DefaultMode = DetailsViewMode.Insert;