Why Does 'Property Cannot Be Assigned' Occur When Sending SMTP Emails?

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

Encountering the "property cannot be assigned" error while sending emails via SMTP often stems from trying to modify read-only properties, particularly To and From, within the MailMessage class.

The solution lies in properly initializing these properties during the object's creation. Instead of assigning them after creating the MailMessage instance, set them directly in the constructor.

Corrected Code Example:

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

// ... other code ...

// Correctly initialize To and From in the constructor
MailMessage mail = new MailMessage("sender@domain.com", "receiver@domain.com"); 
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>

This revised approach avoids the error by correctly setting the recipient addresses during the MailMessage object's initialization, preventing attempts to modify read-only properties later.

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