TemplateMethod.cs

public class LinkGenerator
{
    public string GetLink(string url, string title)
    {
        return string.Format(GetLinkFormatPattern(), url, title);
    }

    public virtual string GetLinkFormatPattern()
    {
        return "<a href=\"{0}\">{1}</a>";
    }
}

public class BoldLinkGenerator : LinkGenerator
{
    public override string GetLinkFormatPattern()
    {
        return "<strong><a href=\"{0}\">{1}</a></strong>";
    }
}

using System.Console;
public class Start
{
    public static void Main(string[] args)
    {
        WriteLine(new LinkGenerator().GetLink("http://www.frenchcoding.com", "French Coding"));
        WriteLine(new BoldLinkGenerator().GetLink("http://www.frenchcoding.com", "French Coding"));
        ReadKey();
    }
}