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Maintain State For ASP.Net FileUpload After PostBack

Posted by Sharpcnet under ASP.NET on 11/5/2013 | Points: 10 | Views : 50529 | Status : [Member] | Replies : 8
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The filename does not stay in Fileupload control's textbox, after postback. I've tried using Session object but it still doesnt work.
ASPX: 
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
      <ContentTemplate>
      <asp:FileUpload ID="fileupload1" runat="server"></asp:FileUpload>
      <asp:Button ID="btnUpload" runat="server" Text="Upload Image" 
           OnClick="btnUpload_Click" />
      </ContentTemplate>
      <Triggers>
          <asp:PostBackTrigger ControlID="btnUpload"  />
      </Triggers>
 </asp:UpdatePanel>
CS: 

protected void Page_Load(object sender, EventArgs e)
    {
         if (Session["FileUpload1"] == null && FileUpload1.HasFile)  
           { 
            Session["FileUpload1"] = FileUpload1;
           }         
        else if (Session["FileUpload1"] != null && (! FileUpload1.HasFile)) 
          { 
            FileUpload1 = (FileUpload) Session["FileUpload1"]; 
          } 
        else if (FileUpload1.HasFile) 
         { 
            Session["FileUpload1"] = FileUpload1;
         }
     }

protected void btnUpload_Click(object sender, EventArgs e)
     {
        if (fileupload1.HasFile)
        {                
            fileUpload1.SaveAs(Server.MapPath("~/UploadedContent/Temp.jpg"));
            img.ImageUrl = "~/UploadedContent/Temp.jpg";
            FileUpload1 = (FileUpload) Session["FileUpload1"]; 
        }
     }
I am able to preview the image onclick, but the filename does not appear anymore after that, in the fileupload control. How can I achieve this.



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Posted by: Bandi on: 11/5/2013 [Member] [MVP] Platinum | Points: 25

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//If first time page is submitted and we have file in FileUpload control but not in session 
        // Store the values to SEssion Object 
        if (Session["FileUpload1"] == null && FileUpload1.HasFile)  
        { 
            Session["FileUpload1"] = FileUpload1; 
            Label1.Text = FileUpload1.FileName; 
        } 
        // Next time submit and Session has values but FileUpload is Blank 
        // Return the values from session to FileUpload 
        else if (Session["FileUpload1"] != null && (! FileUpload1.HasFile)) 
        { 
            FileUpload1 = (FileUpload) Session["FileUpload1"]; 
            Label1.Text = FileUpload1.FileName; 
        } 
        // Now there could be another sictution when Session has File but user want to change the file 
        // In this case we have to change the file in session object 
        else if (FileUpload1.HasFile) 
        { 
            Session["FileUpload1"] = FileUpload1; 
            Label1.Text = FileUpload1.FileName; 
        }

References:
http://www.dotnetspider.com/forum/325894-Save-filename-fileupload-after-postback.aspx
http://www.codeproject.com/Tips/101834/How-to-Maintain-FileUpload-Control-s-State-after-P
http://forums.asp.net/t/1601068.aspx

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Posted by: Bandi on: 11/5/2013 [Member] [MVP] Platinum | Points: 25

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http://stackoverflow.com/questions/18651039/persist-fileupload-control-value

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Posted by: Sharpcnet on: 11/5/2013 [Member] Starter | Points: 25

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Hi, How was this different from my code. Anyways, exactly followed the same, but no luck. Updated my question with the changes. I am expecting the name of the file to show up in the fileupload control's textbox. Is it possible.

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Posted by: Bandi on: 11/5/2013 [Member] [MVP] Platinum | Points: 25

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try this..........

    <form id="form1" runat="server">
    <div>
    <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    <asp:Image ID="img" runat="server"/> 
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" > 
            <ContentTemplate> 
              <asp:FileUpload ID="FileUploadControl" runat="server" EnableViewState="True" ViewStateMode="Enabled" /> 
            </ContentTemplate> 

            <Triggers> 
                <asp:PostBackTrigger ControlID="btnPreview" /> 
            </Triggers> 
        </asp:UpdatePanel> 
        <asp:UpdatePanel ID="UpdatePanel2" runat="server" >      
            <ContentTemplate> 
                <asp:Button ID="btnPreview" runat="server" Text="Preview" OnClick="btnPreview_Click" ViewStateMode="Enabled"/> 
            </ContentTemplate> 
        </asp:UpdatePanel>
        <asp:Label Text="" runat="server" ID="Label1" />
    </div>
    </form>

        protected void Page_Load(object sender, EventArgs e)
        {
                // store the FileUpload object in Session. 
                // "FileUpload1" is the ID of your FileUpload control
                // This condition occurs for first time you upload a file
                if (Session["FileUpload1"] == null && FileUploadControl.HasFile)
                {
                    Session["FileUpload1"] = FileUploadControl;
                    Label1.Text = FileUploadControl.FileName; // get the name 
                }
                // This condition will occur on next postbacks        
                else if (Session["FileUpload1"] != null && (!FileUploadControl.HasFile))
                {
                    FileUploadControl = (FileUpload)Session["FileUpload1"];
                    Label1.Text = FileUploadControl.FileName;
                }
                //  when Session will have File but user want to change the file 
                // i.e. wants to upload a new file using same FileUpload control
                // so update the session to have the newly uploaded file
                else if (FileUploadControl.HasFile)
                {
                    Session["FileUpload1"] = FileUploadControl;
                    Label1.Text = FileUploadControl.FileName;
                }
        }

        protected void btnPreview_Click(object sender, EventArgs e)
        {

            if (FileUploadControl.HasFile)
            {

                Session["fileUpload"] = FileUploadControl;

                FileUploadControl.SaveAs(Server.MapPath("~/Temp.jpg"));

                img.ImageUrl = "~/Temp.jpg";

                FileUploadControl = (FileUpload)Session["fileUpload"];

            }

        }




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Posted by: Sharpcnet on: 11/5/2013 [Member] Starter | Points: 25

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No Luck,..I can preview the image, but the file control still says 'No file chosen'...
Is it possible to use a hidden field to store and bind the file name to the fileupload (in c#)?



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Posted by: Bandi on: 11/5/2013 [Member] [MVP] Platinum | Points: 25

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Even I also tried with hidden field.. But FileUpload.FileName is Read only.. So you can't assign value to it..

Refer this link and try one more attempt
http://www.gchandra.com/web/ajax/how-to-preserve-fileupload-value-in-aspnet.html
http://stackoverflow.com/questions/5326007/assign-file-to-be-uploaded-path-to-fileupload-control-after-postback

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Posted by: vishalneeraj-24503 on: 11/5/2013 [Member] [MVP] Platinum | Points: 25

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http://www.aspsnippets.com/Articles/Using-ASP.Net-AJAX-Control-Toolkits-AsyncFileUpload-Control.aspx

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Posted by: Sharpcnet on: 11/5/2013 [Member] Starter | Points: 25

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Wonder why they aint work for me. And ReadOnly....? Lost all hope then :(. Thanks a lot for your time though.

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