Multiple File Upload in ASP.NET With Example

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

• If you are selecting more than 5 files.
  
• If the file is not selected.
  
• After uploading multiple files.
  
• After uploading files.