Asp.net file upload with overwrite confirmation RSS

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  agrarian

  Member

  6 Points

  22 Posts

  Asp.net file upload with overwrite confirmation

  Dec 23, 2007 05:17 AM|LINK

  Hi,

  I am using asp:fileupload for uploading files. I want to be able to check if the file already exists in the upload folder and ask the user if he/she wants to overwrite the existing file. How can I accomplish this? 

  asp.net 2.0 FileUpload confirm overwrite

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  aadreja

  Contributor

  2090 Points

  354 Posts

  Re: Asp.net file upload with overwrite confirmation

  Dec 23, 2007 07:52 AM|LINK

  you can achieve this using javascript.
  try this
  
  <asp:FileUpload ID="FileUpload1" runat="server" />
  <asp:Button ID="Button1" runat="server" Text="Submit" OnClick="button1_click" />
  <input type="hidden" runat="server" id="hfFileExists" value="0" />
  <input type="hidden" runat="server" id="hfFileExistsConfirm" value="" />
  <input type="hidden" runat="server" id="hfPostedFileName" value="" />
  
  <!-- this script should be placed at the end of form -->
  <script language="javascript" type="text/javascript">
  if(document.getElementById("hfFileExists").value=="1")
  {
        if(confirm("File already exists. Do you want to overwrite"))
          document.getElementById("hfFileExistsConfirm").value = "Yes";
       else
         document.getElementById("hfFileExistsConfirm").value = "No";
  
       document.getElementById("hfFileExists").value="0";
       document.forms[0].submit();
  }
  </script>
  
  C# Code behind
  
  protected void Page_Load(object sender, EventArgs e)
  {
     if (IsPostBack)
     {
        if (hfFileExistsConfirm.Value.ToLower() == "yes")
        {
           hfFileExists.Value = "0";
           hfFileExistsConfirm.Value = "";
           //upload file copy from temp location that we have saved on button click
          System.IO.File.Copy("C:\\temp_" + hfPostedFileName.Value, "C:\\" + hfPostedFileName.Value, true);
       }
    }
  }

  protected void button1_click(object sender, EventArgs e)
  {
       String ServerPath = "C:\\";
       if (System.IO.File.Exists(ServerPath + FileUpload1.FileName))
       {
           hfFileExists.Value = "1";
           hfFileExistsConfirm.Value = "";
           hfPostedFileName.Value = FileUpload1.FileName;
           FileUpload1.PostedFile.SaveAs("C:\\temp_" + FileUpload1.FileName); //Save temporary to some other location then if user selects to overwrite file we can copy that file from this location
       }
       else
       {
          //Upload File
           FileUpload1.PostedFile.SaveAs("C:\\" + FileUpload1.FileName);
        }
  }
  
  Hope it helps, let me know in case of any queries

  Thanks,
  Ritesh
  
  ---------------------------------------------
  Please do not forget to mark as Answer if my reply is helpful.
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  agrarian

  Member

  6 Points

  22 Posts

  Re: Asp.net file upload with overwrite confirmation

  Dec 23, 2007 09:24 AM|LINK

  Thanks for the reply. The approach you used requires that the file is still uploaded to a temporary location on the server even if the user later decided to cancel the operation. I would like to be able to prevent that unnecessary overhead.
  
• • Reply
  

  aadreja

  Contributor

  2090 Points

  354 Posts

  Re: Asp.net file upload with overwrite confirmation

  Dec 23, 2007 03:00 PM|LINK

  Ok.. I got it.
  Let's use AJAX to solve this.
  
  Javascript
  <script type ="text/javascript">
  function CheckFileExists()
  {
      PageMethods.CheckFileExists(document.getElementById('FileUpload1').value,FileExistsCallBack);
      return false;
  }

   

  function FileExistsCallBack(result)
  {
       if(result) //if file exists on server, confirm with user
       {
          if(confirm("File already exists. Do you want to overwrite"))
               __doPostBack('button1','');
      }
      else
          __doPostBack('button1',''); //file doesn't exists on server.. So upload it
  }
  </script>
  
  

  <asp:ScriptManager runat="server" ID="ScriptManager1" EnablePageMethods="true" />
  <asp:FileUpload ID="FileUpload1" runat="server" />
  <asp:Button ID="Button1" runat="server" Text="Submit" CausesValidation="true" OnClientClick="return CheckFileExists()" OnClick="button1_click" />
  
  C# Code behind
  
  protected void button1_click(object sender, EventArgs e)
  {
      String ServerPath = "C:\\";
      FileUpload1.PostedFile.SaveAs(ServerPath + FileUpload1.FileName);
  }

  [System.Web.Services.WebMethod]
  [System.Web.Script.Services.ScriptMethod]
  public static Boolean CheckFileExists(String FileName)
  {
      String ParseFileName;
      ParseFileName = FileName.Substring(FileName.LastIndexOf("\\") + 1);
      if (System.IO.File.Exists("C:\\" + ParseFileName))
         return true;
      else
          return false;
  }
  
  Hope it will be helpful. Well i have tested on my PC and its working as you wanted. enjoy!!!

  Thanks,
  Ritesh
  
  ---------------------------------------------
  Please do not forget to mark as Answer if my reply is helpful.
  • Marked as answer by agrarian on Dec 24, 2007 06:28 AM
• • Reply
  

  tanise

  Member

  2 Points

  1 Post

  Re: Asp.net file upload with overwrite confirmation and problems wtih AJAX

  Oct 15, 2008 05:02 AM|LINK

  Hi,

  Neither overwrite nor upload happens when used with ScriptManager and UpdatePanel... Whats the reason and solution behind this..

• • Reply
  

  krishnada25

  Member

  631 Points

  906 Posts

  Re: Asp.net file upload with overwrite confirmation

  Nov 17, 2008 02:37 AM|LINK

  Hi Iam using the code that you wrote once I click on OK the file is getting saved in the temporary folder instead of the c:\\ folder. how can I copy the existing file from temp to c? and replace the existing one???

  Please Don't mark the Question I posted as Answered until I do it.
  
  Thanks,
  Kris
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  pradeepmanne

  Member

  109 Points

  103 Posts

  Re: Asp.net file upload with overwrite confirmation

  Nov 21, 2011 02:10 PM|LINK

  hi,

  i have followed the script but its not working on tabpanel

  am using ajaxtoolkit for tabpanel the script is not working with tabpanels 

  any solution for that???

  thanks inadvance

  Regards
  Pradeep kumar
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  ramie.net

  Member

  6 Points

  4 Posts

  Re: Asp.net file upload with overwrite confirmation

  Nov 23, 2011 09:08 AM|LINK

  Then check if the file exists before you do the upload.

  // Specify the path to save the uploaded file to.
  string savePath = "c:\\project\\uploads\\";
  
  // Get the name of the file to upload.
  string fileName = FileUpload1.FileName;
  
  // Create the path and file name to check for duplicates.
  string pathToCheck = savePath + fileName;
  
  // Check to see if a file already exists with the same name as the file to upload.
          if (System.IO.File.Exists(pathToCheck))
          {
            //same file exists do something before it is overwritten
          }

   

• • Reply
  

  ramie.net

  Member

  6 Points

  4 Posts

  Re: Asp.net file upload with overwrite confirmation

  Nov 23, 2011 10:55 AM|LINK

  you can write it in javascript

  Add client-side script to a Button, LinkButton, or ImageButton s client-side onclick event can be accomplished through the use of the OnClientClickproperty

  <asp:Button ID="Button" runat="server" OnClientClick="return confirm('Are you certain you want to do what you want to do?');">
  </asp:Button>

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  pradeepmanne

  Member

  109 Points

  103 Posts

  Re: Asp.net file upload with overwrite confirmation

  Dec 14, 2011 02:02 PM|LINK

  hi

  i used this  code its working

  Regards
  Pradeep kumar