Getting Error When Trying To Implement Pagination In Gridview Control

I am trying to implement pagination in my gridview control. Here is the code for databind and pageindexchanged

Private Sub BindGrid()
Dim dataTable as DataTable = CType(Session.Item(APPLICATION_DATA), DataTable)
Grid.DataSource = dataTable.DefaultView
Grid.DataBind()
End Sub

Protected Sub OnChangePageSize(ByVal send As Object, ByVal e As GridViewPageEventArgs) Handles Grid.PageIndexChanging
Grid.PageIndex = e.NewPageIndex
_BindGrid()
End Sub

But I get error after Grid.DataBind() as "Unable to cast object of type 'System.EventArgs' to type 'System.Web.UI.WebControls.GridViewPageEventArgs'"