ASP.NET Web Forms FileUpload

It is an input controller which is used to upload file to the server. It creates a browse button on the form that pop up a window to select the file from the local machine.

To implementFileUpload we can drag it from the toolbox in visual studio.

This is a server side control and ASP.NET provides own tag to create it. The example is given below.

Server renders it as the HTML control and produces the following code to the browser.

This control has its own properties that are tabled below.

Property	Description
AccessKey	It is used to set keyboard shortcut for the control.
TabIndex	The tab order of the control.
BackColor	It is used to set background color of the control.
BorderColor	It is used to set border color of the control.
BorderWidth	It is used to set width of border of the control.
Font	It is used to set font for the control text.
ForeColor	It is used to set color of the control text.
Text	It is used to set text to be shown for the control.
ToolTip	It displays the text when mouse is over the control.
Visible	To set visibility of control on the form.
Height	It is used to set height of the control.
Width	It is used to set width of the control.
AllowMultiple	It is used to allow upload multiple files by setting true or false.

FileUpload Property Window

Example

Here, we are implementing file upload control in web form.

// WebControls.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebControls.aspx.cs" 
Inherits="WebFormsControlls.WebControls" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <p>Browse to Upload File</p>
            <asp:FileUpload ID="FileUpload1" runat="server" />
        </div>
        <p>
            <asp:Button ID="Button1" runat="server" Text="Upload File" OnClick="Button1_Click" />
        </p>
    </form>
    <p>
        <asp:Label runat="server" ID="FileUploadStatus"></asp:Label>
    </p>
</body>
</html>

Code

// WebControls.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebFormsControlls
{
    public partial class WebControls : System.Web.UI.Page
    {
        protected System.Web.UI.HtmlControls.HtmlInputFile File1;
        protected System.Web.UI.HtmlControls.HtmlInputButton Submit1;
        protected void Page_Load(object sender, EventArgs e)
        {
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            if ((FileUpload1.PostedFile != null) && (FileUpload1.PostedFile.ContentLength > 0))
            {
                string fn = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
                string SaveLocation = Server.MapPath("upload") + "\\" + fn;
                try
                {
                    FileUpload1.PostedFile.SaveAs(SaveLocation);
                    FileUploadStatus.Text = "The file has been uploaded.";
                }
                catch (Exception ex)
                {
                    FileUploadStatus.Text = "Error: " + ex.Message;
                }
            }
            else
            {
                FileUploadStatus.Text = "Please select a file to upload.";
            }
        }
    }
}

Create a directory into the project to store uploaded files as we did in below screen shoot.

Output: