design a fileupload control to placeholder in runtime in asp.net

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my design like below

[fileuploadcontrol]
[upload button]
[upload label]

[displayImage button]

In runtime I added placeholder to fileupload control,upload button,upload label.add displayImage button to webpage.when i click the displayImage button it will display fileupload control & upload button.after selecting file path i click the upload button it will upload the file & display the labelas uploaded filename is soandso.but problem is after selecting the path when i click the upload button automatically placeholder were closed.what is the problem give solution.very urgent.please don't give code in vb.net

Posted 5-Jul-10 4:38am

sadanandame

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Abhinav S 5-Jul-10 10:44am

You have not provided any code. It will not be possible for anyone to help you unless you paste some code here.

#realJSOP 5-Jul-10 10:46am

I deleted the other version of this. If you want to change the question a little, then edit the one that's already here.

1 solution

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raju melveetilpurayil · Accepted Answer · 2010-07-06T08:52:00

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class placeholderissue : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            //in display PlaceHolder Content after PostBack
            if ((PlaceHolder1.FindControl("FileUpload1") == null) && (PlaceHolder1.FindControl("Button2") == null) && (PlaceHolder1.FindControl("Label1") == null))
            {
                FileUpload fup = new FileUpload();
                fup.ID = "FileUpload1";
                Button btn = new Button();
                btn.ID = "Button2";
                btn.Text = "Upload";
                btn.Click += new EventHandler(btn_Click);
                Label lbl = new Label();
                lbl.ID = "Label1";

                PlaceHolder1.Controls.Add(fup);
                PlaceHolder1.Controls.Add(btn);
                PlaceHolder1.Controls.Add(lbl);
            }
        }
        else
        {
            FileUpload fup = new FileUpload();
            fup.ID = "FileUpload1";
            Button btn = new Button();
            btn.ID = "Button2";
            btn.Text = "Upload";
            btn.Click += new EventHandler(btn_Click);
            Label lbl = new Label();
            lbl.ID = "Label1";

            PlaceHolder1.Controls.Add(fup);
            PlaceHolder1.Controls.Add(btn);
            PlaceHolder1.Controls.Add(lbl);
        }
     }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if ((PlaceHolder1.FindControl("FileUpload1") == null) && (PlaceHolder1.FindControl("Button2") == null) && (PlaceHolder1.FindControl("Label1") == null))
        {
            FileUpload fup = new FileUpload();
            fup.ID = "FileUpload1";
            Button btn = new Button();
            btn.ID = "Button2";
            btn.Text = "Upload";
            btn.Click += new EventHandler(btn_Click);
            Label lbl = new Label();
            lbl.ID = "Label1";

            PlaceHolder1.Controls.Add(fup);
            PlaceHolder1.Controls.Add(btn);
            PlaceHolder1.Controls.Add(lbl);

        }
       
    }
    protected void btn_Click(object sender, EventArgs e)
    {
        if ((PlaceHolder1.FindControl("FileUpload1") != null)&&(PlaceHolder1.FindControl("Label1") != null))
        {
            FileUpload fup = (FileUpload)PlaceHolder1.FindControl("FileUpload1");
            Label lbl = (Label)PlaceHolder1.FindControl("Label1");
            if ((fup != null) && (lbl != null))
            {
                string _savePath=Server.MapPath(Guid.NewGuid().ToString()+System.IO.Path.GetExtension(fup.FileName));
                fup.SaveAs(_savePath);
                lbl.Text=fup.FileName;
            }
        }
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="placeholderissue.aspx.cs" Inherits="placeholderissue" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Display1" 
            onclick="Button1_Click" />
        <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder> <br />
    <div>
    </form>
</body>
</html>