Is converting a NameValueCollection to a querystring using a c# lambda efficient?

Question

In researching how to convert a NameValueCollection to a querystring, I have come across different methods. I am curious if the shorter lambda syntax is as efficient as it coul

Answer 1

I would do it like this:

public static string ConstructQueryString(NameValueCollection parameters)
{
    var sb = new StringBuilder();

    foreach (String name in parameters)
        sb.Append(String.Concat(name, "=", System.Web.HttpUtility.UrlEncode(parameters[name]), "&"));

    if (sb.Length > 0)
        return sb.ToString(0, sb.Length - 1);

    return String.Empty;
} 

This way you create less objects (that have to be cleaned up by the garbage collector)