access this function in multiple files

In my c# web app, I have a bunch of aspx pages that I want to add error catching, try catch and finally code and anytime the catch exception is invoked I want to call a common function(send an email) I have in my helper.cs file - code below.
The problem is I dont know how to access this function that is in my class, the helper file from my aspx.cs file. I dont want to copy this code accross all my aspx.cs file.

Assistance would be appreciated.

public void SendEmailOpen( string strSubject, string strContent, string strTo, string strCc )
{
      //send email to the admins - get admin list from web.config
      MailMessage mail = new MailMessage();
      
      mail.From = ConfigurationSettings.AppSettings["email_from"];
      mail.Subject = strSubject;
      mail.Body = strContent;
      mail.BodyFormat = MailFormat.Html;
      mail.Priority = MailPriority.High;

      mail.To = strTo;
      mail.Cc = strCc;

      SmtpMail.SmtpServer = ConfigurationSettings.AppSettings["email_server"];
      try
      {
            SmtpMail.Send(mail);
      }
      catch (Exception ex)
      {
            while( ex.InnerException != null )
            {                              
                  ex = ex.InnerException;
            }
      }
}