System.InvalidOperationException:未能映射路径“/sharedDrive/Public”

public partial class TestPage : System.Web.UI.Page
{
    protected DirectoryInfo dir;
    protected FileInfo[] files;

    protected void Page_Load(object sender, EventArgs e)
    {
        dir = new DirectoryInfo(Server.MapPath(@"\\sharedDrive\Public"));
        files = dir.GetFiles();
    }
}

aspx页面看起来像这样:

<% Response.Write(System.Security.Principal.WindowsIdentity.GetCurrent().Name); %>
<ul>
<% foreach (System.IO.FileInfo f in files)
{
    Response.Write("<li>" + f.FullName + "</li>");
} %>
</ul>