The FileUpload control enables you to upload files to the server. It displays a text box control and a browse button that allows users to select a file to upload to the server.

Properties

  1. FileBytes
  2. FileContent
  3. Filename
  4. SaveAs
  5. PostedFile

The FileUpload control provides the HttpPostedFile class. Its has the following properties.

  1. ContentLength
  2. ContentType
  3. Filename
  4. InputStream
  5. SaveAs

Example

The following shows how to upload a single file.

<b>Upload File:</b>
<asp:FileUpload ID="FileUpload1" runat="server" />

The following shows how to upload multiple files.

<b>Upload Multiple File:</b>   
<asp:FileUpload ID="fileuplaod1" runat="server" AllowMultiple="true" Font-Bold="true" />

We need to set AllowMultiple="true".

Example

The following shows how to upload multiple files from various folders.

DifferentFile.aspx

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

<!DOCTYPE html>  

<html xmlns="http://www.w3.org/1999/xhtml">  
<head runat="server">  
    <title></title>  
</head>  
<body>  
    <form id="form1" runat="server">  
        <div align="center">  
            <table border="1">  
                <tr>  
                    <th>Multiple File Upload</th>  
                </tr>  
                <tr>  
                    <td></td>  
                </tr>  
                <tr>  
                    <td>  
                        <asp:FileUpload ID="fileuplaod1" runat="server" AllowMultiple="true" Font-Bold="true" />  
                    </td>  
                </tr>  
                <tr>  
                    <td>  
                        <asp:Button ID="button1" runat="server" Text="upload" OnClick="button1_Click" Width="82px" />  
                    </td>  
                </tr>  
                <tr>  
                    <td></td>  
                </tr>  
                <tr>  
                    <td>  
                        <asp:Label ID="label1" runat="server" ForeColor="Green" Font-Size="Large" Font-Bold="true"></asp:Label><br />  
                    </td>  
                </tr>  
                <tr>  
                    <td></td>  
                </tr>  
                <tr>  
                    <td>  
                        <asp:Label ID="labbel2" runat="server" Font-Bold="true" ForeColor="Red" Font-Size="Large"></asp:Label><br />  
                    </td>  
                </tr>  
                <tr>  
                    <td>  
                        <asp:Label ID="label3" runat="server" Font-Bold="true" ForeColor="Black" Font-Size="Large"></asp:Label>  
                    </td>  
                </tr>  
            </table>  
        </div>  
    </form>  
</body>  
</html>

Code File DifferentFile.aspx.cs

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

public partial class differntfolder : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void button1_Click(object sender, EventArgs e)
    {
        label1.Text = "<b>uploaded file</b><br/>";
        labbel2.Text = "<b>not uploaded file</b><br/>";
        label1.Visible = true;

        try
        {
            // Check File Present or not
            if (fileuplaod1.HasFiles)
            {
                int filecount = 0;
                int fileuploadcount = 0;

                // Check No of Files Selected
                filecount = fileuplaod1.PostedFiles.Count();

                if (filecount <= 10)
                {
                    foreach (HttpPostedFile postfiles in fileuplaod1.PostedFiles)
                    {
                        // Get The File Extension
                        string filetype = Path.GetExtension(postfiles.FileName);

                        if (filetype.ToLower() == ".docx" || filetype.ToLower() == ".pdf" || filetype.ToLower() == ".txt" || filetype.ToLower() == ".doc")
                        {
                            // Get The File Size In Bite
                            double filesize = postfiles.ContentLength;

                            if (filesize < (1048576))
                            {
                                fileuploadcount++;
                                string serverfolder = string.Empty;
                                string serverpath = string.Empty;

                                // Adding File Into Specific Folder Depend On his Extension
                                switch (filetype)
                                {
                                    case ".doc":
                                    case ".docx":
                                        serverfolder = Server.MapPath(@"uplaodfiles\document\");
                                        // Check Folder available or not
                                        if (!Directory.Exists(serverfolder))
                                        {
                                            // Create Folder
                                            Directory.CreateDirectory(serverfolder);
                                        }
                                        serverpath = serverfolder + Path.GetFileName(postfiles.FileName);
                                        fileuplaod1.SaveAs(serverpath);
                                        label1.Text += "[" + postfiles.FileName + "]- document file uploaded successfully<br/>";
                                        break;

                                    case ".pdf":
                                        serverfolder = Server.MapPath(@"uplaodfiles\pdf\");
                                        // Check Folder available or not
                                        if (!Directory.Exists(serverfolder))
                                        {
                                            // Create Folder
                                            Directory.CreateDirectory(serverfolder);
                                        }
                                        serverpath = serverfolder + Path.GetFileName(postfiles.FileName);
                                        fileuplaod1.SaveAs(serverpath);
                                        label1.Text += "[" + postfiles.FileName + "]- pdf file uploaded successfully<br/>";
                                        break;

                                    case ".txt":
                                        serverfolder = Server.MapPath(@"uplaodfiles\text_document\");
                                        // Check Folder available or not
                                        if (!Directory.Exists(serverfolder))
                                        {
                                            // Create Folder
                                            Directory.CreateDirectory(serverfolder);
                                        }
                                        serverpath = serverfolder + Path.GetFileName(postfiles.FileName);
                                        fileuplaod1.SaveAs(serverpath);
                                        label1.Text += "[" + postfiles.FileName + "]- text_document file uploaded successfully<br/>";
                                        break;
                                }
                            }
                            else
                            {
                                labbel2.Text += "[" + postfiles.FileName + "]- files not uploaded size is greater than (1)MB.<br/>Your File Size is(" + (filesize / (1024 * 1024)) + ") MB </br>";
                            }
                        }
                        else
                        {
                            labbel2.Text += "[" + postfiles.FileName + "]- file type must be .doc or .pdf or .txt<br/>";
                        }
                    }
                }
                else
                {
                    label1.Visible = false;
                    labbel2.Text = "You selected (" + filecount + ") files <br/>";
                    labbel2.Text += "Please select a maximum of ten (10) files!!!";
                }

                label3.Visible = true;
                label3.Text = "Total File = (" + filecount + ")<br/> Uploaded file = (" + fileuploadcount + ")<br/> Not Uploaded = (" + (filecount - fileuploadcount) + ")";
            }
            else
            {
                label1.Visible = false;
                label3.Visible = false;
                labbel2.Text = "<b>Please select the file for upload!!!</b></br>";
            }
        }
        catch (Exception ex)
        {
            labbel2.Text = ex.Message;
        }
    }
}

Output