Caching an XML document with a file dependency

cached-xml.cs

XmlDocument xDoc = null;
string xmlPath = "~/App_Data/SomeXml.xml";

if (HttpContext.Current.Cache[xmlPath] == null) {
	string cacheFilePath = HttpContext.Current.Server.MapPath(xmlPath);
	xDoc = new XmlDocument();
	xDoc.Load(cacheFilePath);
	HttpContext.Current.Cache.Insert(xmlPath, xDoc, new CacheDependency(cacheFilePath));
} else {
	xDoc = (XmlDocument)HttpContext.Current.Cache[xmlPath];
}

cached-xml.vb

Dim xDoc As XmlDocument
Dim xmlPath As String = "~/App_Data/SomeXml.xml"

If HttpContext.Current.Cache(xmlPath) Is Nothing Then
    Dim cacheFilePath As String = HttpContext.Current.Server.MapPath(xmlPath)
    xDoc = New XmlDocument()
    xDoc.Load(cacheFilePath)
    HttpContext.Current.Cache.Insert(xmlPath, xDoc, New CacheDependency(cacheFilePath))
Else
    xDoc = DirectCast(HttpContext.Current.Cache(xmlPath), XmlDocument)
End If