[Solved] ASP.Net Error: Invalid expression term

I revisited a question I asked about adding image logo to an email. I got method on how to do this but I could not add my HTML buttons and texts to the email.

In my code, I have an HTML button with some texts, and on the button click, there is a URL redirection to activation page where new user account will be activated. 

Please I need help on this.

Thank you 

Here is my Code that sends mail to new user upon signing up

private void SendActivationEmail(int Uid)
{
    string activationCode = Guid.NewGuid().ToString();
    using (SqlConnection con = new SqlConnection("Data Source = (LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\JosmadeLocal_DB.mdf;Integrated Security = True"))
    {
        using (SqlCommand cmd = new SqlCommand("INSERT INTO ActivationTable VALUES(@Uid, @ActivationCode)"))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("@Uid", Uid);
                cmd.Parameters.AddWithValue("@ActivationCode", activationCode);
                cmd.Connection = con;
                con.Open();
                cmd.ExecuteNonQuery();
                con.Close();
            }
        }
    }
    using (MailMessage mm = new MailMessage("support@outlook.com", mailtxtbx.Text))
    {
        mm.Subject = "Account Activation";
 
        mm.AlternateViews.Add(Mail_Body());
        string body = "Hello " + txtname.Text.Trim() + ",";
        body += "<br /><br />Welcome!";
        body += "<br /><br />Please click the Button below to confirm your email";
        body += "<br /><br /><a style='display: block; width: 170px; height: 27px; background: #32CD32;padding: 7px;font-family: Nunito; text-align:center; border-radius: 5px;color: white;font-weight: 600;text-decoration: none;' href = '"
        + Request.Url.AbsoluteUri.Replace("signup", "Activation.aspx?ActivationCode=" + activationCode) + "'>Activate Account</a>";
        body += "<br /><br />Thanks";
        body += "<br /><br />Admin";
        mm.Body = body;
        mm.IsBodyHtml = true;
 
        SmtpClient SMTP = new SmtpClient("myhosting.secureserver.net", 25);
        SMTP.UseDefaultCredentials = false;
        SMTP.Credentials = new NetworkCredential()
        {
            UserName = "support@outlook.com",
            Password = "XXXXXXXXXXXXXXX"
        };
        SMTP.EnableSsl = false;
        SMTP.Send(mm);
    }
}

Here is how I tried to change the code adding image logo to it

private void SendActivationEmail(int Uid)
{
    string activationCode = Guid.NewGuid().ToString();
    using (SqlConnection con = new SqlConnection("Data Source = (LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\JosmadeLocal_DB.mdf;Integrated Security = True"))
    {
        using (SqlCommand cmd = new SqlCommand("INSERT INTO ActivationTable VALUES(@Uid, @ActivationCode)"))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter())
            {
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("@Uid", Uid);
                cmd.Parameters.AddWithValue("@ActivationCode", activationCode);
                cmd.Connection = con;
                con.Open();
                cmd.ExecuteNonQuery();
                con.Close();
            }
        }
    }
    using (MailMessage mm = new MailMessage("support@outlook.com", mailtxtbx.Text))
    {
        mm.Subject = "Account Activation";
        mm.AlternateViews.Add(Mail_Body());
        mm.IsBodyHtml = true;
 
        SmtpClient SMTP = new SmtpClient("myhosting.secureserver.net", 25);
        SMTP.UseDefaultCredentials = false;
        SMTP.Credentials = new NetworkCredential()
        {
            UserName = "support@outlook.com",
            Password = "XXXXXXXXXXXXXXX"
        };
        SMTP.EnableSsl = false;
        SMTP.Send(mm);
    }
}
private AlternateView Mail_Body()
{
    string path = Server.MapPath(@"~/images/myImage.png");
    string user = txtname.Text;
    LinkedResource Img = new LinkedResource(path, MediaTypeNames.Image.Jpeg);
    LinkedResource Lbl = new LinkedResource(path, MediaTypeNames.Text.Html);
    Img.ContentId = "MyImage";
    Lbl.ContentId = "myuser";
    string str = @"   
        <table>   
            <tr>   
                <td>   
                  <img src=cid:MyImage  id='img' alt='' width='100px' height='60px'/>    
                </td>   
            </tr>
             <tr>   
                <td>   
                       'Hello' <label Text=cid:myuser id='lbl' font-size='10pt'/>
                </td>   
            </tr> 
            <tr>   
                <td>   
                       'Welcome !'
                </td>   
            </tr> 
            <tr>   
                <td>   
                     'Please click the Button below to confirm your email'
                </td>   
            </tr> 
            <tr>   
                <td>   
                      <a style='display: block; width: 170px; height: 27px; background: #32CD32;padding: 7px;font-family: Nunito; text-align:center; border-radius: 5px;color: white;font-weight: 600;text-decoration: none;' href = '"
        + Request.Url.AbsoluteUri.Replace("signup", "Activation.aspx?ActivationCode=" + activationCode) + "'>Activate Account</a>
                </td>   
            </tr> 
            <tr>   
                <td>
                       'Thanks'
                </td>   
            </tr>
            <tr>   
                <td>
                    '- The Admin'
                </td>   
            </tr>  
        </table>   
        ";
    AlternateView AV =
    AlternateView.CreateAlternateViewFromString(str, null, MediaTypeNames.Text.Html);
    AV.LinkedResources.Add(Img);
    return AV;
}

Error CS1525 Invalid expression term '/' 
Error CS1525 Invalid expression term '<' 
Error CS1525 Invalid expression term '/' 
Error CS1525 Invalid expression term '<' 
Error CS1525 Invalid expression term '<' 
Error CS1012 Too many characters in character literal 
Error CS1525 Invalid expression term '/' 
Error CS1525 Invalid expression term '<' 
Error CS1525 Invalid expression term '/' 
Error CS1525 Invalid expression term '<' 
Error CS1525 Invalid expression term '<' 
Error CS1012 Too many characters in character literal 
Error CS1525 Invalid expression term '/' 
Error CS1525 Invalid expression term '<' 
Error CS1525 Invalid expression term '/' 
Error CS1525 Invalid expression term '<' 
Error CS1525 Invalid expression term '/' 
Error CS1010 Newline in constant Error CS1002 ; expected