Update checked gridview rows

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VB

Hi All

I had a problem with updating only the checked rows in GridView. I need to update one column cell value based on the ID value of the Checked rows only

What I have tried:

I tried this code but it update random rows, not the checked, can you please help me solve this issue?

Try
    Dim I As Integer
    For I = 0 To GridView1.SelectedRowsCount() - 1
        If (GridView1.GetSelectedRows()(I) >= 0) Then
            Dim strID As String = GridView1.GetRowCellValue(I, "ID")
            Dim strUpdate As String = "UPDATE records SET payment_order= @payment_order where ID = @ID"
            cmd.CommandType = CommandType.Text
            cmd.CommandText = strUpdate.ToString()
            cmd.Parameters.Clear()
           
            cmd.Parameters.AddWithValue("@payment_order", rfnd_id_lbl.Text)
            cmd.Parameters.AddWithValue("@ID", strID)
            cmd.Connection = con
            con.Open()
            cmd.ExecuteNonQuery()
        End If
    Next

Catch ex As SqlException
    Dim errorMsg As String = "Error in Update"
    errorMsg += ex.Message
    Throw New Exception(errorMsg)
Finally
    con.Close()
End Try