Send Mail with Asp.Net

1. Send Simple Mail in Asp.Net without any credentials (Host, Username or password)
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using System.Net.Mail;

public static void SendMail(string From, string To, string Body, string Subject)
{
SmtpClient objSmtpClient = new SmtpClient();

// Given SMTP Server name here.
objSmtpClient.Host = ConfigurationManager.AppSettings["SmtpServer"].ToString();
objSmtpClient.Port = 25;

MailMessage objMailMessage = new MailMessage();
MailAddress objMailAddress = new MailAddress(From);
objMailMessage.From = objMailAddress;
objMailMessage.To.Add(To);
objMailMessage.Subject = Subject;
objMailMessage.IsBodyHtml = true;
objMailMessage.Body = Body;
objMailMessage.Priority = MailPriority.High;

objSmtpClient.Send(objMailMessage);
}

2. Send Mail in Asp.Net with credentials (Host, Username or password)
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using System.Net.Mail;

public static void SendMail(string From, string To, string Body, string Subject)
{
// Here, You can give SMTP Server Host name or IP Address.
SmtpClient objSmtpClient = new SmtpClient("HostNameOrIP");

MailMessage objMailMessage = new MailMessage();
MailAddress objMailAddress = new MailAddress(From);
objMailMessage.From = objMailAddress;
objMailMessage.To.Add(To);
objMailMessage.Subject = Subject;
objMailMessage.IsBodyHtml = true;
objMailMessage.Body = Body;
objMailMessage.Priority = MailPriority.High;

// Give your SMTP Server UserName and Password
objSmtpClient.Credentials = new System.Net.NetworkCredential("UserName", "Password");

objSmtpClient.Send(objMailMessage);
}