Collection of file upload source code

namespace Wmj 
{ 
public class MyUpload 
{ 
private  postedFile=null; 
private string savePath=""; 
private string extension=""; 
private int fileLength=0; 
//Show the parameter information used by this component
public string Help 
{ 
get{ 
string helpstring; 
helpstring="<font size=3>MyUpload myUpload=new MyUpload(); //Constructor";
helpstring+="=;//Set the file to be uploaded";
helpstring+="=\"e:\\\";//Set the path to upload to the server, default c:\\";
helpstring+="=100; //Set the maximum length of uploaded files, unit k, default 1k";
helpstring+="=\"doc\";Set the extension of uploaded file, default txt";
helpstring+="=();//Start upload and display the upload result</font>";
helpstring+="<font size=3 color=red>Design By WengMingJun 2001-12-12 All Right Reserved!</font>"; 
return helpstring; 
} 
} 
public  PostedFile 
{ 
get 
{ 
return postedFile; 
} 
set 
{ 
postedFile=value; 
} 
} 
public string SavePath 
{ 
get 
{ 
if(savePath!="") return savePath; 
return "c:\\"; 
} 
set 
{ 
savePath=value; 
} 
} 
public int FileLength 
{ 
get 
{ 
if(fileLength!=0) return fileLength; 
return 1024; 
} 
set 
{ 
fileLength=value*1024; 
} 
} 
public string Extension 
{ 
get 
{ 
if(extension!="") return extension; 
return "txt"; 
} 
set 
{ 
extension=value; 
} 
} 
public string PathToName(string path) 
{ 
int pos=("\\"); 
return (pos+1); 
} 
public string Upload() 
{ 
if(PostedFile!=null) 
{ 
try{ 
string fileName=PathToName(); 
if(!(Extension)) return "You must select "+Extension+" file!"; 
if(>FileLength) return "File too big!"; 
(SavePath+fileName); 
return "Upload File Successfully!"; 
} 
catch( exc) 
{return ;} 
} 
return "Please select a file to upload!"; 
} 
} 
} 
Use csc /target:Library   to compile it into a dll for multiple calls to it later
Call example
<%@page language="C#" runat="server"%> 
<%@import namespace="Wmj"%> 
<script language="C#" runat="server"> 
void Upload(object sender,EventArgs e) 
{ 
MyUpload myUpload=new MyUpload(); 
// =; 
=; 
="e:\\"; 
=100; 
=(); 
} 
</script> 
<form enctype="multipart/form-data" runat="server"> 
<input type="file"  runat="server"/> 
<asp:Button  Text="Upload" OnClick="Upload" runat="server"/> 
<asp:Label  runat="server"/> 
</form>