DataGrid Web Server control disappearing when handling Edit column event

[Patrick]

I am using VB to implement a code behind class for an
ASP.NET form. I am loading a DataGrid web server control
with data from a table in a SQL database. the code is as
follows:

Private Sub Page_Load(ByVal sender As System.Object, ByVal
e As System.EventArg s) Handles MyBase.Load
'Put user code to initialize the page here
If Not Page.IsPostBack Then
Dim con As SqlConnection = New SqlConnection
("server=(local );Integrated
Security=SSPI;d atabase=Invento ryManagement")
' Dim currentCursor As
System.Cursof = Cursor.Current

Dim dsSched As DataSet = New DataSet

'
' load the grid with preliminary scheduling
information
'
' show wait cursor
' Cursor.Current = Cursors.WaitCur sor
Dim daSched As SqlDataAdapter = New
SqlDataAdapter( "Select * from Schedule", con)
' daSched.FillSch ema(dsSched,
SchemaType.Sour ce, "Schedule")
daSched.Fill(ds Sched, "Schedule")
' AddHandler dsSched.Tables
("Schedule").Ro wChanging, New DataRowChangeEv entHandler
(AddressOf Row_Changing)
Dim col As System.Data.Dat aColumn
For Each col In dsSched.Tables
("Schedule").Co lumns
col.ReadOnly = False
Next
InputGrid.DataS ource = dsSched
InputGrid.DataM ember = "Schedule"
InputGrid.DataB ind()
' restore cursor
'Cursor.Current = currentCursor
con.Close()
End If
End Sub

Here is the Edit command handler:

Private Sub InputGrid_EditC ommand(ByVal source As Object,
ByVal e As
System.Web.UI.W ebControls.Data GridCommandEven tArgs)
Handles InputGrid.EditC ommand
InputGrid.EditI temIndex = e.Item.ItemInde x
InputGrid.DataB ind()
End Sub

when this code is run, the page refreshes and the grid is
not rendered on the screen. am i missing something? i
tried setting all the columns to read/write, but this did
not help.