Es porque no es e-Newpageingex es e.newpageindex
Código ASP:
Ver originalProtected Sub gvwFiles_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles gvwFiles.PageIndexChanging
gvwFiles.PageIndex = e.NewPageIndex
BindGrid()
End Sub