C#

string username = "user1";
string password = "pass1";

string body = "something with a (username) and a (password)";

body = body.Replace("(username)", username);
body = body.Replace("(password)", password);

string body = "something with a " + username + " and a " + password;

string body = string.Format("something with a {0} and a {1}", username, password);

string Username = "Vuyiswa";

          string Password = "secret";

          string strBody = @"<p>Thank you for using !obooking System <br><br> Username:(Username)<br><br>Password:(Password)<br<br>Kind Regards !oBooking</p>";
      strBody = strBody.Replace("(Username)", Username).Replace("(Password)", Password);

          Response.Write(strBody)

strBody.Replace("(Username)",Username);

strBody.Replace("(Password)",Password);

strBody = strBody.Replace("(Username)", Username).Replace("(Password)", Password);

strBody.Replace(char oldchar,char newChar)

Vuyiswa Maseko wrote:

strBody.Replace(char oldchar,char newChar)

musefan wrote:

Good Spot!