using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.IO;

namespace FileUpload

{

       /// <summary>

       /// Summary description for WebForm1.

       /// </summary>

       public class WebForm1 : System.Web.UI.Page

       {

              protected System.Web.UI.HtmlControls.HtmlInputFile File1;

              protected System.Web.UI.WebControls.Button cmdUpload;

              protected System.Web.UI.WebControls.Label lblMessage;

              string sFileDir= "C:\\";

              long lMaxFileSize = 4096; 

              private void Page_Load(object sender, System.EventArgs e)

              {

              }

              private void DeleteFile (string strFileName)

              {//Delete file from the server

                     if (strFileName.Trim().Length > 0)

                     {

                           FileInfo fi = new FileInfo(strFileName);

                           if (fi.Exists)//if file exists delete it

                           {     

                                  fi.Delete();

                           }

                     }

              }

              #region Web Form Designer generated code

              override protected void OnInit(EventArgs e)

              {

                     //

                     // CODEGEN: This call is required by the ASP.NET Web Form Designer.

                     //

                     InitializeComponent();

                     base.OnInit(e);

              }

              /// <summary>

              /// Required method for Designer support - do not modify

              /// the contents of this method with the code editor.

              /// </summary>

              private void InitializeComponent()

              {   

                     this.cmdUpload.Click += new System.EventHandler(this.cmdUpload_Click);

                     this.Load += new System.EventHandler(this.Page_Load);

              }

              #endregion

              private void cmdUpload_Click(object sender, System.EventArgs e)

              {

                     if (( File1.PostedFile != null) && (File1.PostedFile.ContentLength > 0))

                     {

                           //determine file name

                           string sFileName = System.IO.Path.GetFileName(File1.PostedFile.FileName);

                           try

                           {

                                  if (File1.PostedFile.ContentLength <= lMaxFileSize)

                                  {

                                         //Save File on disk

                                         File1.PostedFile.SaveAs(sFileDir + sFileName);

                                         lblMessage.Visible=true;

                                         lblMessage.Text="File: " + sFileDir + sFileName + " Uploaded Successfully";

                                  }

                                  else //reject file

                                  {

                                         lblMessage.Visible=true;

                                         lblMessage.Text="File Size if Over the Limit of " + lMaxFileSize ;

                                  }

                           }

                           catch(Exception)//in case of an error

                           {

                                  lblMessage.Visible = true;

                                  lblMessage.Text="An Error Occured. Please Try Again!";

                                  DeleteFile(sFileDir + sFileName);

                           }

                     }

              }

       }

}