ASP.net Error clicking GridView button

Hi

I just copied code from a 2010 ASP.net project to a 2015 ASP.net project. When I click on a button in my GridView it causes the error embedded at the bottom of this entry. I have pasted the VB.net code below followed by the Markup on the page. I am not quite sure how to fix this error, which didn't occur in my 2010 ASP.net project.

Imports System.Data
Imports System.Data.SqlClient

Public Class Order1
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Call oLoad()
    End Sub

    Sub oLoad()
        Try
            Dim oSQL As String = "Select * From Test2"
            Dim oGridView As GridView = Me.GridView2
            Call oLoadGrid(oGridView, oSQL)
        Catch ex As Exception
            Response.Write(ex.Message & " rqq4")
        End Try
    End Sub

    Protected Sub GridView2_SelectedIndexChanged(sender As Object, e As EventArgs) Handles GridView2.SelectedIndexChanged

    End Sub

    Sub oLoadGrid(ByVal oGridView As GridView, ByVal oSQL As String)


        oGridView.Visible = True
        Dim cs As String = ConfigurationManager.ConnectionStrings("PSQL").ConnectionString
        Dim cn As New SqlConnection(cs)

        Try

            Dim cmd As New SqlCommand(oSQL, cn)

            '// open the connection
            cn.Open()

            '// execute the sql statement
            Using reader As SqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)

                oGridView.DataSource = reader
                oGridView.DataBind()

            End Using

        Catch ex As Exception
            Response.Write(ex.Message & " yuma310")
        Finally
            If cn.State <> ConnectionState.Closed Then
                cn.Close()
            End If
        End Try
    End Sub

    Private Sub GridView2_RowCommand(sender As Object, e As GridViewCommandEventArgs) Handles GridView2.RowCommand
        Try


            If (e.CommandName = "MyButton1") Then
                ' Retrieve the row index stored in the CommandArgument property.
                Dim index As Integer = Convert.ToInt32(e.CommandArgument)

                ' Retrieve the row that contains the button 
                ' from the Rows collection.
                Dim row As GridViewRow = GridView2.Rows(index)

                ' Add code here to add the item to the shopping cart.
                'Me.Label_Selection.Text = "At line " & CStr(row.RowIndex + 1) & " selection is: " & "Strongly agree"
                'row.Cells(0).Text = "Strongly Agree"


                row.BackColor = Drawing.Color.Cyan
                row.Cells(6).ForeColor = Drawing.Color.DarkGreen

            End If

        Catch ex As Exception
            Response.Write(ex.Message & " mb62")
        End Try
    End Sub
End Class

Select allOpen in new window

<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Site.Mobile.Master" CodeBehind="Order.aspx.vb" Inherits="Mobile1.Order1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="FeaturedContent" runat="server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="MainContent" runat="server">
    <asp:Panel ID="Panel_Order" runat="server">

<asp:GridView ID="GridView2" runat="server" BackColor="White"
                        BorderColor="#3366CC" BorderStyle="Solid"
    BorderWidth="1px" CellPadding="4"
                        Height="116px" Width="795px" Visible="False">
            <Columns>
                <asp:TemplateField HeaderText="Select" HeaderStyle-Font-Size ="Small"
                                            ControlStyle-Font-Bold ="false" ControlStyle-Forecolor ="#006600"
                                            ControlStyle-Font-Size ="Smaller">
                    <ItemTemplate>
                        <asp:Button ID="Button1" runat="server"
                      CommandName="MyButton1"
                      CommandArgument="<%# CType(Container,GridViewRow).RowIndex %>"
                      Text="Select" />
                    </ItemTemplate>
                    <ControlStyle Font-Bold="False" Font-Size="Smaller" ForeColor="#006600" />
                    <HeaderStyle Font-Size="Small" />
                </asp:TemplateField>

            </Columns>
            <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
            <HeaderStyle BackColor="White" Font-Bold="False" ForeColor="#000066" />
            <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
            <RowStyle BackColor="White" ForeColor="#003399" />
            <SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
            <SortedAscendingCellStyle BackColor="#EDF6F6" />
            <SortedAscendingHeaderStyle BackColor="#0D4AC4" />
            <SortedDescendingCellStyle BackColor="#D6DFDF" />
            <SortedDescendingHeaderStyle BackColor="#002876" />
        </asp:GridView>

    </asp:Panel>
</asp:Content>