Demonstration for web-based upload in ASP.Net
2008-10-08
The code is extracted from part of my data transfer application. It demonstrates how to perform the following tasks in ASP.Net:
1. Web-based upload
2. File type validation
3. File renaming on timestamp
<%@ Page Language="C#" %>
<script runat="server">
protected void btnUpload_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileExt = System.IO.Path.GetExtension(FileUpload1.FileName);
string timestamp = DateTime.Now.ToString("yyyyMMddhhmmss");
if (fileExt.ToLower() == ".xls")
{
try
{
string filename = Server.MapPath("") + "\\spreadsheet" + timestamp + ".xls";
FileUpload1.SaveAs(filename);
lblMessage.Text = "File name: " +
FileUpload1.PostedFile.FileName + "<br>" +
"File name on the server: " + filename + "<br>" +
FileUpload1.PostedFile.ContentLength + " kb<br>" +
"Content type: " +
FileUpload1.PostedFile.ContentType + "<br><font color='red'><strong>Spreadsheet upload is completed!</strong></font><br>";
}
catch (Exception ex)
{
lblMessage.Text = "ERROR: " + ex.Message.ToString();
}
}
else
lblMessage.Text = "Only .xls files allowed!";
}
else
{
lblMessage.Text = "You have not specified a file.";
}
}
</script>
<html>
<head>
<title>Spreadsheet upload demonstration</title>
<style type="text/css">
body, input {font-size:10px; font-family: Trebuchet MS;}
</style>
</head>
<body>
<form id="form1" runat="server">
Your spreadsheet file: <asp:FileUpload ID="FileUpload1" runat="server" Width="300" />
<asp:Button ID="btnUpload" runat="server" OnClick="btnUpload_Click"
Text="Upload File" /><br />
<asp:Label ID="lblMessage" runat="server"/>
</form>
</body>
</html>
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