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How to upload a file to a Web server in asp.net

asp.net FileUpload: how to use FileUpload
FileUpload.aspx 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUpload.aspx.cs" Inherits="FileUpload" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>asp.net FileUpload: how to use FileUpload</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Green">FileUpload: how to upload file</h2>
        <asp:Label ID="Label1" runat="server">
        </asp:Label>
        <br />
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Button1_Click" />
    </div>
    </form>
</body>
</html>
FileUpload.aspx.cs 
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class FileUpload : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!this.IsPostBack)
        {
            Label1.ForeColor = System.Drawing.Color.Green;
            Label1.Font.Italic = true;
            FileUpload1.BackColor = System.Drawing.Color.Green;
            FileUpload1.ForeColor = System.Drawing.Color.AliceBlue;
            Button1.ForeColor = System.Drawing.Color.Green;
            Button1.Font.Bold = true;
        }
    }

    protected void Button1_Click(object sender, EventArgs e) {
        if (FileUpload1.HasFile)
            try
            {
                FileUpload1.SaveAs("C:\\Upload\\" + FileUpload1.FileName);
                Label1.Text = "Upload successfull. <br />" +
                    "File Name: " + FileUpload1.PostedFile.FileName +
                    "<br />File Type: " + FileUpload1.PostedFile.ContentType+
                "<br />File Length: " + FileUpload1.PostedFile.ContentLength;
            }
            catch (Exception ex)
            {
                Label1.Text = "Error: " + ex.Message.ToString();
            }
        else
        {
            Label1.Text = "Select a file";
        }
    }
}








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