I want to change font design some part of this result value

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C#

C#4.0

Dear sir,

I am using String Builder for get a result set. Here I want to change the design some part of the result set.

Here is the code. When I use this code it changes all font of the result set.

sb.Append( "<i>"+"Heart Disease" +"<i />"+ " :  " + dr["heart_Disease2"] + "<br />");

I want Italic font for Heart dieses but it makes all the line as italic.

Thanks & Regards Bigyan Sahoo