How to insert a gridview with a row image button into the email body

I wrote some code that sends emails and inserts a table cell from Gridview.

Protected Sub SendRequestMail()
    Dim tryCount As Integer = 5
    Dim failed As Boolean = False
    Do
        Try
            failed = False

            Dim ToMailIDs As String
            ToMailIDs = LblRecipients.Text

            Using sw As New StringWriter()
                Using hw As New HtmlTextWriter(sw)

                    GridView1.RenderControl(hw)
                    Dim sr As New StringReader(sw.ToString())

                    Dim smtpSection As SmtpSection = CType(ConfigurationManager.GetSection("system.net/mailSettings/smtp"), SmtpSection)
                    Dim mm As MailMessage = New MailMessage()

                    mm.From = New MailAddress(smtpSection.From, "Notification")
                    For i As Integer = 0 To ToMailIDs.Split(","c).Length - 1
                        mm.To.Add(New MailAddress(ToMailIDs.Split(","c)(i)))
                    Next

                    mm.ReplyTo = New MailAddress("[email protected]")

                    mm.Subject = LblMrNumFull.Text & " | " & LblMrDate1x.Text & " | " & LblStorsName1.Text & " - Approval"

                    mm.Body = LblMrNumFull.Text & " | " & LblMrDate1x.Text & " | " & LblStorsName1.Text
                  
                    mm.Body += sw.ToString()

                    mm.Body += "<br />"
                    mm.Body += "Thanking you" 
                    
                    mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure
                    mm.DeliveryNotificationOptions = DeliveryNotificationOptions.Delay
                    mm.Headers.Add("Disposition-Notification-To", "[email protected]")

                    ' ----- webconfig mail start
                    mm.IsBodyHtml = True
                    Dim smtp As SmtpClient = New SmtpClient
                    smtp.Host = smtpSection.Network.Host
                    smtp.EnableSsl = smtpSection.Network.EnableSsl
                    Dim networkCred As NetworkCredential = New NetworkCredential(smtpSection.Network.UserName, smtpSection.Network.Password)
                    smtp.UseDefaultCredentials = smtpSection.Network.DefaultCredentials
                    smtp.Credentials = networkCred
                    smtp.Port = smtpSection.Network.Port
                    smtp.Send(mm)
                    ' ----- webconfig mail end

                End Using
            End Using

        Catch ex As Exception
            failed = True
            tryCount = tryCount - 1
        Finally
            Response.Redirect("~/abc/xyx.aspx?NewID=" & Request.QueryString("NewID"))
        End Try

    Loop While failed AndAlso tryCount > 0
End Sub

That code worked, and the email was successfully sent. After that, I have added an image button to the last column in the Gridview:

Then emails stop being sent. Please suggest the above code for sending emails with or without the last column of image buttons.

tried nothing works

'To Export all pages.

GridView1.AllowPaging = False
Me.BindData_GridView1()

GridView1.HeaderRow.BackColor = Color.White
For Each cell As TableCell In GridView1.HeaderRow.Cells
    cell.BackColor = GridView1.HeaderStyle.BackColor
Next
For Each row As GridViewRow In GridView1.Rows
    row.BackColor = Color.White
    For Each cell As TableCell In row.Cells
        If row.RowIndex Mod 2 = 0 Then
            cell.BackColor = GridView1.AlternatingRowStyle.BackColor
        Else
            cell.BackColor = GridView1.RowStyle.BackColor
        End If
        cell.CssClass = "textmode"
    Next
Next

Solution

I got the solution from another forum, so I posted it below.

HTML

<%@ Page Title="" Language="vb" AutoEventWireup="false"  EnableEventValidation="false" MasterPageFile="~/abc/xyz.Master" CodeBehind="aaaa1.aspx.vb" Inherits="aaaa.sss" %>

VB.NET

Protected Sub SendRequestMail()
Dim tryCount As Integer = 5
Dim failed As Boolean = False
Do
    Try
        failed = False
        Dim ToMailIDs As String
        ToMailIDs = LblRecipients.Text
        GridView1.Columns(GridView1.Columns.Count - 1).Visible = False
        Using sw As New StringWriter()
            Using hw As New HtmlTextWriter(sw)
                GridView1.RenderControl(hw)
                Dim sr As New StringReader(sw.ToString())
                Dim smtpSection As Net.Configuration.SmtpSection = CType(ConfigurationManager.GetSection("system.net/mailSettings/smtp"), SmtpSection)
                Dim mm As System.Web.Mail.MailMessage = New System.Web.Mail.MailMessage()
                mm.From = New MailAddress(smtpSection.From, "Notification")
                For i As Integer = 0 To ToMailIDs.Split(","c).Length - 1
                    mm.To.Add(New MailAddress(ToMailIDs.Split(","c)(i)))
                Next
                mm.ReplyTo = New MailAddress("[email protected]")
                mm.Subject = LblMrNumFull.Text & " | " & LblMrDate1x.Text & " | " & LblStorsName1.Text & " - Approval"
                mm.Body = LblMrNumFull.Text & " | " & LblMrDate1x.Text & " | " & LblStorsName1.Text
                mm.Body += sw.ToString()
                mm.Body += "<br />"
                mm.Body += "Thanking you"
                mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure
                mm.DeliveryNotificationOptions = DeliveryNotificationOptions.Delay
                mm.Headers.Add("Disposition-Notification-To", "[email protected]")
                ' ----- webconfig mail start
                mm.IsBodyHtml = True
                Dim smtp As SmtpClient = New SmtpClient
                smtp.Host = smtpSection.Network.Host
                smtp.EnableSsl = smtpSection.Network.EnableSsl
                Dim networkCred As NetworkCredential = New NetworkCredential(smtpSection.Network.UserName, smtpSection.Network.Password)
                smtp.UseDefaultCredentials = smtpSection.Network.DefaultCredentials
                smtp.Credentials = networkCred
                smtp.Port = smtpSection.Network.Port
                smtp.Send(mm)
                ' ----- webconfig mail end
            End Using
        End Using
        GridView1.Columns(GridView1.Columns.Count - 1).Visible = True
    Catch ex As Exception
        failed = True
        tryCount = tryCount - 1
    Finally
        Response.Redirect("~/abc/xyx.aspx?NewID=" & Request.QueryString("NewID"))
    End Try
Loop While failed AndAlso tryCount > 0

End Sub

Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control) End Sub

Thank you