C#, it failed at Script compilation error: Cannot declare namespace in script code

Question

I found this code I want to run in a script, but I have this error:

Script compilation error: Cannot declare namespace in script code

I want to finish a function that to send a email by C#

using System;
using System.Windows.Forms;
using System.Net.Mail;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.sina.com");

                mail.From = new MailAddress("[email protected]");
                mail.To.Add("[email protected]");
                mail.Subject = "Test Mail";
                mail.Body = "This is for testing SMTP mail from SINA";

                SmtpServer.Port = 25;
                SmtpServer.Credentials = new System.Net.NetworkCredential("hello", "world");
                SmtpServer.EnableSsl = true;

                SmtpServer.Send(mail);
                MessageBox.Show("mail Send");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}

How can I do this?

That's an unusual error message, what are you trying to compile it with? — musefan
– musefan, Commented Jun 7, 2018 at 7:14
Also, what do you mean by "when I run the query"? You've shown a Windows Forms application... I don't see any sign of a C# script or a query. Please give us more context - it may well be that you're trying to use C# in a context where this kind of code is inappropriate. — Jon Skeet
– Jon Skeet, Commented Jun 7, 2018 at 7:19
That code compiles and runs just fine on Visual Studio 17 as a C# Windows Forms project. — AS Mackay
– AS Mackay, Commented Jun 7, 2018 at 8:06
It seems you run scriptcs yourself. Please consider developing in a real IDE instead of using Notepad and compiling yourself. An IDE has many advantages... — Thomas Weller
– Thomas Weller, Commented Jun 7, 2018 at 11:32

Joel Coehoorn · Accepted Answer · 2022-02-10 21:13:19Z

2

Thanks everyone for your helping on this blog. I just have figured out on my own, just use the pure functional code, works well.

MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("smtp.sina.com");

mail.From = new MailAddress("[email protected]");
mail.To.Add("[email protected]");
mail.Subject = "Test Mail";
mail.Body = "This is for testing SMTP mail from SINA";

SmtpServer.Port = 25;
SmtpServer.Credentials = new System.Net.NetworkCredential("hello", "world");
SmtpServer.EnableSsl = true;

SmtpServer.Send(mail);

edited Feb 10, 2022 at 21:13

Joel Coehoorn

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answered Jun 7, 2018 at 11:25

Tom Tang

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1 Comment

Jay Over a year ago

I ran into the same problem today. It took hours, but I finally got it to work. Did you ever happen to figure out why it doesn't work with the class & namespace?

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