ASP.NET: Bold parts of text using HtmlGenericControl - asp.net

Question

I am a complete ASP.NET newbie, so this will probably be simple.
I have a label which text is set dynamically in the code behind using the following pseudo code
label.Text = string.Format(SOME-DYNAMIC-MESSAGE(ID,1), name, day);
The SOME-DYNAMIC-MESSAGE has a form of, where {0} and {1} refers to variables name and day.
Hello {0}, today is {1}.
I need to make those variables bold. I am trying to wrap them in span, so I can access them from CSS using this code
HtmlGenericControl bold = new HtmlGenericControl("span");
bold.InnerText = name;
bold.Attributes.Add("class", "bold");
label.Text = string.Format(SOME-DYNAMIC-MESSAGE(ID,1), bold, day);
but it doesn't work, no extra wrapper added. It even stopped to show me the the content of the variable.
Anybody knows how to fix this?

Answer 1

Try :
label.Text = string.Format(SOME-DYNAMIC-MESSAGE(ID,1), "<span style=\"font-weight:bold\">" + bold + "</span>", "<span style=\"font-weight:bold\">" + day + "</span>");

Answer 2

Here is a quick sample app (Console app) to demonstrate an approach. I think you are trying to format the input string for String.Format and make the font-weight of the token ({0}, {1}, etc...) bold.
use this Func<string,string> to format the input string. then add the following CSS to your html page:
class Program
{
static void Main(string[] args)
{
var input = #"Hello {0}, today is {1}.";
Func<string, string> SomeDynamicMessage = s => {
var val = s;
val = val.Replace("{", "<span class='bold-token'>{");
val = val.Replace("}", "}</span>");
return val;
};
Console.WriteLine(SomeDynamicMessage(input));
// output: Hello <span class='bold-token'>{0}</span>, today is <span class='bold-token'>{1}</span>.
var final = Console.ReadLine();
}
}
Css snippet:
.bold-token { font-weight: bold; }
Final output:
Hello <span class='bold-token'>{0}</span>, today is <span class='bold-token'>{1}</span>
EDIT -- MORE INFO
Here is how you should use it:
var input = #"Hello {0}, today is {1}.";
label.Text = string.Format(SomeDynamicMessage(input), "test", "Thursday");
and the output would be:
Hello <span class='bold-token'>test</span>, today is <span class='bold-token'>Thursday</span>