[Download Code]

Once you have added a new webform to your project you are ready to add the necessary components.

First, drag a file field component onto your web form. Second, drag a button on your web form. Finally, drag a label onto your web form. You can name each of these components as you desire. Once you have accomplished these steps you should see something along these lines:

Now let us move on to the code that will process the file uploads.

[Download Code]

Now you should see something along the lines of the following when viewing the page in your browser:

The code behind is as follows:

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 FileUpload.
 /// </summary>
 public class FileUpload : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.Label uploadLblMessage;
  protected System.Web.UI.WebControls.Button cmdUploadFile;
  protected System.Web.UI.WebControls.Label FileUploadTexLabel;
  protected System.Web.UI.HtmlControls.HtmlInputFile FileToUpload;
      
  string strFileDirectory = "C:\\temp\\";
      
  private void Page_Load(object sender, System.EventArgs e)
  {
  }
 
  #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.cmdUploadFile.Click += new System.EventHandler(this.cmdUpload_Click);
   this.Load += new System.EventHandler(this.Page_Load);


  }
  #endregion


  private void DeleteExistingFile (string strFileName)
  {


   if (strFileName.Trim().Length > 0)
   {
    FileInfo fileToDelete = new FileInfo(strFileName);
    
    //if file exists then we will delete it
    if (fileToDelete.Exists)
    {     
     fileToDelete.Delete();
    }
   }
  } 
 
  private void cmdUpload_Click(object sender, System.EventArgs e)
  {


   //determine file name to be uploaded
   string strFileName = System.IO.Path.GetFileName(FileToUpload.PostedFile.FileName);


   if (( FileToUpload.PostedFile != null) && (FileToUpload.PostedFile.ContentLength > 0))
   {
    try
    {             
     //Save File to the server
     FileToUpload.PostedFile.SaveAs(strFileDirectory + strFileName);
     uploadLblMessage.Visible = true;
     uploadLblMessage.Text = "File: " + strFileDirectory + strFileName + " Uploaded Successfully";
    }
    catch(Exception ex)
    {
     uploadLblMessage.Visible = true;
     uploadLblMessage.Text = ex.Message;
     DeleteExistingFile(strFileDirectory + strFileName);
    }
   }
   else
   {
    uploadLblMessage.Text = "Select a file to upload. Please Try Again!";
   }


  }
 }
}

When you attempt to upload a file you will be notified if the upload was a success or failure. Here is an example:

You could of course expand on this and limit the file size of uploads, creating unique directories to hold uploads for any given user, and sending out notification via email when a new upload occurs. I hope this example finds a use during you development process.