How to pass a String Variable in the Email using the System.Net.Mail (MailMessage Object)

 Dear all,
Kindly tell me that how can I pass a String/Integer Variable(such as Telephone Number, Customer Name, etc.) in the Email which is sent by using the System.Net.Mail(using the 'MailMessage' Object). I have wrote this code, kindly see an help me if possible.

 
Please find the below mentioned code:-

        MailMessage mMailMessage = new MailMessage();
        mMailMessage.From = new MailAddress(from);
        mMailMessage.To.Add(new MailAddress(to));
        mMailMessage.Body.Insert(1, ClientPhoneNumber);
   
        if ((bcc != null) && (bcc != string.Empty))
        {
     & ...