Bold Output of text

Hello Everyone, I am quite new to the c# language, and .ASP is not all that familiar to me either. I have a seemingly simple line of c# code which I need to output Bold text as opposed to standard plain text. The code you see here is responsible for outputting content into an email. Here is a sample line of code. sb.Append(" "); sb.Append(" "); sb.Append(" "); sb.Append(""); sb.Append(""); sb.Append(""); sb.Append("

LAST NAME: " + this.txtLastName.Text + "

FIRST NAME: " + this.txtFirstName.Text + "

MIDDLE INITIAL: " + this.txtMiddleInitial.Text + "

"); Basically I would like "this.txtFirstName.Text" to be Bold in the resulting Email. I am sure there isa imple explanation but I am a novice when it comes to this topic. Thank you so much for your help in advance.