Why Does Setting SMTP Recipient and Sender Addresses Directly Cause a 'Property Cannot Be Assigned' Error in .NET?

Understanding the "Property Cannot Be Assigned" Error in SMTP Email Sending

Sending SMTP emails using the System.Net.Mail namespace is a common task in .NET development. However, setting the recipients and sender addresses directly in the MailMessage object can sometimes lead to the "property cannot be assigned" error.

The reason for this error is that the To and From properties of the MailMessage class are read-only. They must be set using the constructor of the class, as demonstrated in the following code:

using System.Net.Mail;

MailMessage mail = new MailMessage("sender@example.com", "recipient@example.com");
mail.Subject = "this is a test email";
mail.Body = "this is my test email body";

By setting the To and From addresses in the constructor, we ensure that they are assigned correctly before sending the email. This prevents the "property cannot be assigned" error and allows the email to be sent successfully.

Therefore, when sending SMTP emails in .NET, it is essential to remember to set the To and From addresses using the MailMessage constructor rather than modifying them directly. This practice ensures error-free email sending and allows for robust and reliable communication solutions.

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