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Can you give me solutions for how to send email in without using password in c#.
Please give me

What I have tried:

string to = "";
            string from = "";
            MailMessage message = new MailMessage(from, to);

            System.Text.StringBuilder sb = new System.Text.StringBuilder();

            sb.AppendFormat("<tr><td>Name:</td><td>{0}</td></tr>", txtName.Text.Trim());
            sb.AppendFormat("<tr><td>Email:</td><td>{0}</td></tr>", txtEmail.Text.Trim());
            sb.AppendFormat("<tr><td>Phone No</td><td>{0}</td></tr>", txtPhoneNo.Text.Trim());
            sb.AppendFormat("<tr><td>Organisation:</td><td>{0}</td></tr>", txtOrganisation.Text.Trim());          
            message.Subject = "BDS Contacted by " + txtName.Text;
            message.Body = sb.ToString();
            //message.BodyEncoding = Encoding.UTF8;
            message.IsBodyHtml = true;
            SmtpClient client = new SmtpClient("", 587);
            System.Net.NetworkCredential basicCredential1 = new
            System.Net.NetworkCredential("", "abc");
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;
            client.Credentials = basicCredential1;
            catch (Exception ex)
                throw ex;
Updated 29-Oct-18 1:06am

Basically, you can't, unless your email service is configured to not need one - and that's is incredibly rare. Most systems are set up to require a password (which may only have to be entered to your reader / writer app once) before they will send an email for security: to prevent me pretending to be you; and to prevent spammers and phishers from using your account via rogue or trojan apps.

Check with your email service, and see what they say - if they don't permit it, then you can't do it.
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Use the SMTP server provided by your web host.

Things you shouldn't spend time doing - Sending email via Gmail[^]
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