Upload file to server : FileUpload « ASP.net Controls « ASP.NET Tutorial

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="UploadFile" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <form id="form1" runat="server">
    <asp:FileUpload ID="Uploader" runat="server" Height="24px" Width="472px" />&nbsp;
        <asp:Button ID="cmdUpload" runat="server" Height="24px" OnClick="cmdUpload_Click"
            Text="Upload" Width="88px" /><br />
        <br />
        <asp:Label ID="lblInfo" runat="server" EnableViewState="False" Font-Bold="True"></asp:Label></div>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class UploadFile : System.Web.UI.Page 
    private string uploadDirectory;
    protected void Page_Load(object sender, EventArgs e)
        uploadDirectory = Path.Combine(Request.PhysicalApplicationPath, "Uploads");

    protected void cmdUpload_Click(object sender, EventArgs e)
        if (Uploader.PostedFile.FileName == "")
            lblInfo.Text = "No file specified.";
            string extension = Path.GetExtension(Uploader.PostedFile.FileName);
            switch (extension.ToLower())
                case ".png":
                case ".jpg":
                    lblInfo.Text = "This file type is not allowed.";
            string serverFileName = Path.GetFileName(Uploader.PostedFile.FileName);
            string fullUploadPath = Path.Combine(uploadDirectory,serverFileName);


                lblInfo.Text = "File " + serverFileName;
                lblInfo.Text += " uploaded successfully to ";
                lblInfo.Text += fullUploadPath;
            catch (Exception err)
                lblInfo.Text = err.Message;

3.19.1.Accepting File Uploads
3.19.2.FileUpload Test
3.19.3.Upload file to server
3.19.4.Uploading files using the new FileUpload control (C#)
3.19.5.Uploading files using the new FileUpload control (VB)
3.19.6.Changing the file-size limitation setting in the web.config file
3.19.7.The user selects a file from the local disk and the page manages to persist it to a server location