how can i update datagrid which has a checkBox

<asp:templatefield headertext="Any Text" xmlns:asp="#unknown">
<itemstyle wrap="false">
<itemtemplate>
<asp:checkbox id="chkStatus" runat="server">
AutoPostBack="true" OnCheckedChanged="chk_OnCheckedChanged"
Checked='<%# Eval("Status") %>'
Text='<%# If(Eval("Status").ToString().Equals("TRUE"), " Returned" , " SOLD" ) %>' />




CODE BEHIND

Private Sub chk_OnCheckedChanged(ByVal sender As Object, ByVal e As EventArgs)

' GET THE CHECKBOX NAME.
Dim chkStatus As CheckBox = DirectCast(sender, CheckBox)
Dim row As GridViewRow = DirectCast(chkStatus.NamingContainer, GridViewRow)

If chkStatus.Checked Then
' WRITE YOU CODE TO SAVE DATA.

End if

End Sub