UriBuilder名称空间

Question

Before I ask my question I must say that I read MSDN website before and used Using System; as namespace for class.

When I use the class UriBuilder with Using System in my code,it is dis-active. What is the namespace of this class?

I am using visual studio 2008 and my operation system is windows 7.

The sample of code

public partial class Form1 : Form
{
    static public string AssemblyDirectory
    {
        get
        {
            string codeBase = Assembly.GetExecutingAssembly().CodeBase;
            UriBuilder uri = new UriBuilder(codeBase);
            string path = (uri.Path);
            return Path.GetDirectoryName(path);
        }
    }

Answer 1

This MSDN link shows you which namespace to use and the assembly you will need to reference to utilize this class for each version of the .NET framework.

http://msdn.microsoft.com/en-us/library/system.web.ui.design.urlbuilder(v=vs.110).aspx