Sending email in C# using classemail function

public void SendMail1(string[] ToId, string Subject, string MailBody)
       {
           try
           {
               ClassEmail.classEmail objMail = new ClassEmail.classEmail();
               string fromMail = "abc@gmail.com";
              
               objMail.SendEmail(fromMail, Subject, null, MailBody, ToId);

           }
           catch (Exception ex)
           {

           }
       }

using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;

namespace ClassEmail
{
    public class classEmail : Page
    {
        public classEmail();

        public string SendEmail(string EmailFrom, string EmailSubject, HtmlInputFile emailAttachment, string emailBody, params string[] EmailTo);
        public string SendEmailAttachment(string EmailFrom, string EmailSubject, Array emailAttachmentpaths, string emailBody, params string[] EmailTo);
        public string SendEmailAttachment(string EmailFrom, string EmailSubject, HtmlInputFile emailAttachment, string emailBody, params string[] EmailTo);
        public string SendEmailAttachment(string EmailFrom, string EmailSubject, string emailAttachmentpath, string emailBody, params string[] EmailTo);
        public string SendEmailAttachmentReplyTo(string EmailFrom, string EmailSubject, Array emailAttachmentpaths, string emailBody, string ReplyTo, params string[] EmailTo);
        public string SendEmailAttachmentWithCC(string EmailFrom, string EmailSubject, Array emailAttachmentpaths, string emailBody, string ccIds, params string[] EmailTo);
        public string SendEmailAttachmentWithCCBCC(string EmailFrom, string EmailSubject, Array emailAttachmentpaths, string emailBody, string ccIds, string bccIds, params string[] EmailTo);
        public string SendEmailWithReplyTo(string EmailFrom, string EmailSubject, HtmlInputFile emailAttachment, string emailBody, string ReplyTo, params string[] EmailTo);
        public string SendEmailWithReplyToWithCC(string EmailFrom, string EmailSubject, string emailAttachment, string emailBody, string ReplyTo, string ccIds, params string[] EmailTo);
        public string SendEmailWithReplyToWithCCBCC(string EmailFrom, string EmailSubject, string emailAttachment, string emailBody, string ReplyTo, string ccIds, string bccIds, params string[] EmailTo);
    }
}