How do I correctly reference uriparser?

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C#3.5

Hi. I am trying to add a procedure to a C# project. The procedure contains

typeof(UriParser)

but I get a compiler error:

The type or namespace name 'UriParser' could not be found (are you missing a using directive or an assembly reference?)

The following lines are included above the namespace:

<pre lang="C#">
using System;
using System.Text;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;
using System.Reflection;</pre>

and the references in Solution Explorer are System, System.Data, System.Windows,Forms and System.Xml. 

What reference am I missing?

The entire procedure is to do with removing an unescaped slash from the url:

public void LeaveDotsAndSlashesEscaped()
{
    var getSyntaxMethod =
        typeof(UriParser).GetMethod("GetSyntax", BindingFlags.Static | BindingFlags.NonPublic);
    if (getSyntaxMethod == null)
    {
        //throw new MissingMethodException("UriParser", "GetSyntax");
    }

    var uriParser = getSyntaxMethod.Invoke(null, new object[] { "http" });

    var setUpdatableFlagsMethod =
        uriParser.GetType().GetMethod("SetUpdatableFlags", BindingFlags.Instance | BindingFlags.NonPublic);
    if (setUpdatableFlagsMethod == null)
    {
        //throw new MissingMethodException("UriParser", "SetUpdatableFlags");
    }

    setUpdatableFlagsMethod.Invoke(uriParser, new object[] { 0 });
}

(I also commented out the 'throw new ...' lines because they cause 2 other errors, but I am handling errors elsewhere, so it doesn't matter.)

Thank you for your help.

What I have tried:

The actual issue is the 'unwanted backslash in url' problem in a Windows CE6.0 Net Compact Framework project, and I have looked at a number of would-be solutions in VB.net and also C#, but all have major problems with the CE6.0 and Net CF. This solution (above) only has one error to get rid of, so I am sticking with it till the error is gone!