Multiple File Upload Browser Control in Asp.Net 2.0

This article gives you the solution for creating mutiple file upload controls dyanimically to allow you to upload multiple files at same time.

C# code

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
         if (Page.IsPostBack == true)
        {
             AddRows();
         }
    }

    private void AddRows()
    {
         try
        {
             if (hidCurRow.Value != "" && hidCurRow.Value != "0")
            {
                 DecreaseCount();
             }
             else if(hidCurRow.Value == "")
            {
                 IncreaseCount();
             }

             for (int count = 1; count < tblMin.Rows.Count; count++)
             {
                 tblMin.Rows.RemoveAt(1);
            }

            int maxRows = Convert.ToInt32(hidMax.Value);
             string[] arrRows = hidRow.Value.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
             for (int count = 1; count <= maxRows; count++)
            {
                Boolean isAdd = false;
                 for (int incount = 0; incount < arrRows.Length; incount++)
                 {
                     if (arrRows[incount] == count.ToString())
                    {
                        isAdd = true;
                         break;
                     }
                 }

                 if (isAdd == true)
                {
                    TableRow tr = new TableRow();

                    TableCell tcfu = new TableCell();
                    FileUpload fup = new FileUpload();
                    fup.ID = "fu" + count.ToString();
                    tcfu.Controls.Add(fup);

                    TableCell tcbtn = new TableCell();
                    Button bt = new Button();
                    bt.ID = "btn" + count.ToString();
                    bt.Text = "Remove";
                     bt.Attributes.Add("onclick", "DecreaseRow('" + count.ToString() + "');");
                     tcbtn.Controls.Add(bt);


                     tr.Cells.Add(tcfu);
                      tr.Cells.Add(tcbtn);

                      tblMin.Rows.Add(tr);
                 }
             }
         }
         catch
        {

         }
    }

    private void IncreaseCount()
    {
         string strVal = hidMax.Value;
        if (strVal != "")
        {
             int iMax = Convert.ToInt32(strVal);
            iMax = iMax + 1;
            hidMax.Value = iMax.ToString();

             if (hidRow.Value != "")
            {
                hidRow.Value = hidRow.Value + "," + iMax.ToString();
             }
             else
            {
                hidRow.Value = iMax.ToString();
             }
        }
    }

    private void DecreaseCount()
    {
         string strCurRow = hidCurRow.Value;
        string[] arrRows = hidRow.Value.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
        hidRow.Value = "";
        for (int count = 0; count < arrRows.Length; count++)
         {
             if (arrRows[count] != strCurRow)
             {
                 if (hidRow.Value == "")
                {
                    hidRow.Value = arrRows[count];
                 }
                 else
                {
                    hidRow.Value = hidRow.Value + "," + arrRows[count];
                 }
             }
         }
    }

     protected void btnAdd_Click(object sender, EventArgs e)
    {

     }

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
         if (hidRow.Value != "")
        {
             string[] strVal = hidRow.Value.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
             for (int count = 0; count < strVal.Length; count++)
            {
                FileUpload fup = new FileUpload();
                fup = (FileUpload)tblMin.FindControl("fu" + strVal[count]);
                 if (fup != null)
                 {
                     if (fup.PostedFile != null && fup.FileName != "")
                     {
                          //your code here
                     }
                 }
             }
         }
    }
}





ASPX

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

<!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>Untitled Page</title>
    <script type="text/javascript" language="javascript">
      
        //set current row no to delete        function DecreaseRow(rowNo)
        {
            var hid = document.getElementById('<%= hidCurRow.ClientID %>');
            hid.value = rowNo;

        }
        
         //clear the delete row hiddent file to show that its insert
function IncreseRows()
        {
            var hid = document.getElementById('<%= hidCurRow.ClientID %>');
            hid.value = "";

        }
        
        //Set zero for Submit
        function SetZero()
        {
            var hid = document.getElementById('<%= hidCurRow.ClientID %>');
            hid.value = "0";
        }
    </script>
</head>
<body>
   
    <form id="form1" runat="server">
        <asp:Table ID="tblMin" runat="server">
            <asp:TableHeaderRow>
                <asp:TableHeaderCell>
                        File
                </asp:TableHeaderCell>
                <asp:TableHeaderCell>
                        Remove
                </asp:TableHeaderCell>
            </asp:TableHeaderRow>
            <asp:TableRow>
                <asp:TableCell>
                    <asp:FileUpload ID="fu1" runat="server" />
                </asp:TableCell>
                <asp:TableHeaderCell>
                    <asp:Button ID="btn1" runat="server" Text="Remove" OnClientClick="return DecreaseRow('1');" />
                </asp:TableHeaderCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click" Text="Add" OnClientClick="return IncreseRows();" />
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" OnClientClick="SetZero();"/><br />
        <asp:HiddenField ID="hidMax" runat="server" value="1"/>
        <asp:HiddenField ID="hidRow" runat="server" value="1"/>
        <asp:HiddenField ID="hidCurRow" runat="server"/>
    </form>
</body>
</html>