VB.NET RowUpdating event doesn't work - vb.net

Question

The following code runs successfully with no errors, but I still don't get the new data from the grid, by adding a break point, and stepping forward, the data in the variables are the original data, not the updated data, what am I missing?
Private Sub grvSample_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles grvSample.RowUpdating
Dim row As GridViewRow = DirectCast(grvSample.Rows(e.RowIndex), GridViewRow)
Dim passportNumber As TextBox = DirectCast(row.FindControl("txtNumber"), TextBox)
Dim expiry As TextBox = DirectCast(row.FindControl("txtExpiry"), TextBox)
Dim type As TextBox = DirectCast(row.FindControl("txtType"), TextBox)
Dim name As TextBox = DirectCast(row.FindControl("txtName"), TextBox)
Dim cinvnum As TextBox = DirectCast(row.FindControl("txtCINVNUM"), TextBox)
Dim last As TextBox = DirectCast(row.FindControl("txtLast"), TextBox)
Dim drplist As DropDownList = DirectCast(row.FindControl("DDLNat"), DropDownList)
Dim Conn As New SqlConnection("Data Source=ADMIN-PC;Initial Catalog=T1INV;Integrated Security=True")
Dim cmd As New SqlCommand("update pass_details set passnat='" & drplist.SelectedValue & "', passno='" & passportNumber.Text.Trim() & "', passexp='" & expiry.Text.Trim() & "', passtype='" & type.Text.Trim() & "', nameonpass='" & name.Text.Trim() & "', namelast='" & last.Text.Trim & "' where cinvnum='" & cinvnum.Text.Trim() & "'", Conn) ' where cinvnum='" & grvSample.Rows(e.RowIndex) & "'")
Try
Conn.Open()
cmd.ExecuteNonQuery()
' Refresh the data
grvSample.EditIndex = -1
Dim SSQL = "select * from pass_details"
Dim ds As New DataSet("GET_HIS")
Dim adp As New SqlDataAdapter(SSQL, Conn)
adp.Fill(ds, "TAB_SMT")
grvSample.DataSource = ds.Tables("TAB_SMT")
grvSample.DataBind()
Catch ee As SqlException
Finally
cmd.Dispose()
Conn.Close()
Conn.Dispose()
End Try
End Sub

Answer 1

I assume that you're databinding the GridView also on postbacks. That would override the changed values.
So check it in Page_Load in the following way:
If Not Page.IsPostBack Then
BindGrid()
End If
Apart from that GridViewUpdateEventArgs contains a dictionary with NewNalues.
Dim passportNumber = e.NewValues("passno")
Note that they're also overridden on databind.