Why Do I Get a 'Property Cannot Be Assigned' Error When Sending SMTP Emails in .NET?

Troubleshooting "Property Cannot Be Assigned" Error in .NET SMTP Email Sending

Developing email functionality in .NET requires a thorough understanding of property behavior. A frequent problem is the "property cannot be assigned" error when sending SMTP emails.

Let's examine a typical scenario:

<code class="language-csharp">MailMessage mail = new MailMessage();
SmtpClient client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Host = "smtp.gmail.com";
mail.To = "[email protected]"; // Error occurs here
mail.From = "[email protected]";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body";
client.Send(mail);</code>

This error arises because mail.To and mail.From are read-only properties. The solution is to initialize these properties within the MailMessage constructor:

<code class="language-csharp">using System.Net.Mail;

...

MailMessage mail = new MailMessage("[email protected]", "[email protected]");
SmtpClient client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Host = "smtp.gmail.com";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body";
client.Send(mail);</code>

By setting the recipient and sender addresses during object creation, the "property cannot be assigned" error is avoided, ensuring correct email transmission.

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