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Upload file to server

<%@ 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> </head> <body>     <form id="form1" runat="server">     <div>     <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>     </form> </body> </html> 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.";         }         else         {             string extension = Path.GetExtension(Uploader.PostedFile.FileName);             switch (extension.ToLower())             {                 case ".png":                 case ".jpg":                     break;                 default:                     lblInfo.Text = "This file type is not allowed.";                     return;             }             string serverFileName = Path.GetFileName(Uploader.PostedFile.FileName);             string fullUploadPath = Path.Combine(uploadDirectory,serverFileName);             try             {                 Uploader.PostedFile.SaveAs(fullUploadPath);                 lblInfo.Text = "File " + serverFileName;                 lblInfo.Text += " uploaded successfully to ";                 lblInfo.Text += fullUploadPath;             }             catch (Exception err)             {                 lblInfo.Text = err.Message;             }         }     } }