How to dynamically change font color to RED for required fields

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MVC4

Hi All,

I have an entry form where some fields are mandatory so displaying asterix sign there(*).
Now I have a requirement to change Font-color of all the fields marked with asterix to RED Color. I have a code block where I am displaying asterix if the field is required. I am not getting how to modify it to change the font-color to RED. Below is the code:-

public static DoubleDiv BeginControlGroupForWorkType(this HtmlHelper htmlHelper, string controlId, string label, bool isRequired, WorkEffort workEffort)
       {
           string validationHTML = GetValidationMessage(htmlHelper, controlId, label, Enums.WorkEffortTab.None);
           if (string.IsNullOrEmpty(validationHTML))
               validationHTML = GetValidationMessageForWorkType(htmlHelper, controlId, workEffort);

           htmlHelper.ViewContext.Writer.Write(string.Format(@"
               <div class=""control-group"">
                   {0}
                   <label class=""control-label"" for=""{1}"">{2} {3}</label>
                   <div class=""controls"">",
               validationHTML,
               controlId,
               isRequired ? "">*" : string.Empty,
               label));

           return new DoubleDiv(htmlHelper.ViewContext);
       }

Can anybody please help me in this.

Thanks
Fozia

What I have tried:

I am trying to modify the existing Required class but it is not impacting the label. I also tried putting isRequired line again but how to modify the existing label with that condition, because label is already created above that isRequired condition.