Ti posto tutto il codice così forse capisci...
Per l'upload in asp.net 
fileupload.aspx
codice:
<%@ Page Language="C#" AutoEventWireup="True" Debug="true"%>
<%@ Import Namespace="System.IO" %>
<script Language="C#" runat="server">
protected void SubmitButton_Click(Object sender, EventArgs e)
{
string filepath = Server.MapPath("/" + "Downloads") + "\\";
string fileName = "";
HttpFileCollection uploadedFiles = Request.Files;
Span1.InnerHtml = "";
for (int i = 0; i < uploadedFiles.Count; i++)
{
HttpPostedFile userPostedFile = uploadedFiles[i];
try
{
if (userPostedFile.ContentLength > 0 )
{
fileName = Path.GetFileName(userPostedFile.FileName);
Span1.InnerHtml += "<u>File #" + (i+1) + "</u>
";
Span1.InnerHtml += "File Content Type: " + userPostedFile.ContentType + "
";
if (userPostedFile.ContentLength > 1024)
{
Span1.InnerHtml += "File Size: " + ((double)(userPostedFile.ContentLength) / 1024.0).ToString("N3") + " kb
";
}
else
{
Span1.InnerHtml += "File Size: " + userPostedFile.ContentLength + " bytes
";
}
Span1.InnerHtml += "File Name: " + userPostedFile.FileName + "
";
userPostedFile.SaveAs(filepath + "\\" + Path.GetFileName(userPostedFile.FileName));
Span1.InnerHtml += "Location where saved: " + filepath + "\\" + Path.GetFileName(userPostedFile.FileName) + "
";
} // if (userPostedFile.ContentLength > 0 )
}
catch (Exception Ex)
{
Span1.InnerText += "Error:
" + Ex.Message;
}
}
}
</script>
<html>
<head>
</head>
<body>
Back to Index
<form enctype="multipart/form-data" runat="server"></br>
Select File1:
<input id="File1" type="file" runat="Server"/>
Select File2:
<input id="File2" type="file" runat="Server"/>
Select File3:
<input id="File3" type="file" runat="Server"/>
Select File4:
<input id="File4" type="file" runat="Server"/>
Select File5:
<input id="File5" type="file" runat="Server"/>
Select File6:
<input id="File6" type="file" runat="Server"/>
Select File7:
<input id="File7" type="file" runat="Server"/>
Select File8:
<input id="File8" type="file" runat="Server"/>
Select File9:
<input id="File9" type="file" runat="Server"/>
Select File10:
<input id="File10" type="file" runat="Server"/>
Select File11:
<input id="File11" type="file" runat="Server"/>
Select File12:
<input id="File12" type="file" runat="Server"/>
Select File13:
<input id="File13" type="file" runat="Server"/>
Select File14:
<input id="File14" type="file" runat="Server"/>
Select File15:
<input id="File15" type="file" runat="Server"/>
<input id="Submit1" type="submit" value="Upload Files" runat="Server" onserverclick="SubmitButton_Click"/>
<span id="Span1" runat="Server"></span>
</form>
Back to Index
</body>
</html>
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