How to find out the User Name The ASP.NET is run under in the code

[David Shvartsman]

Hell everyone. We have some problem with the security
while trying to upload files trough the System.IO and
getting the follow error:

DirectoryNotFoundException: Could not find a part of the
path "\\<server name>\share$".]
System.IO.__Error.WinIOError(Int32 errorCode, String
str) +287
System.IO.Directory.InternalCreateDirectory(String
fullPath, String path) +489
System.IO.Directory.CreateDirectory(String path) +195
_ASP.uploadForm_aspx.DoUpload(Object Sender, EventArgs
e) +721
System.Web.UI.WebControls.Button.OnClick(EventArgs e)
+108

System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEve
ntHandler.RaisePostBackEvent(String eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent
(IPostBackEventHandler sourceControl, String
eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent
(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1277

I was wandering how to find out the User Name The ASP.NET
is run under in the code behind.

Any input would be greatly appreciated