Multiple File Upload Custom Control in ASP.NET

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;
using System.Globalization;
using System.Threading;
using System.Collections.Generic;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // allows the javascript function to do a postback and call the onClick method 
        // associated with the linkButton LinkButton1. 
        string jscript = "function UploadComplete(){" + ClientScript.GetPostBackEventReference(LinkButton1, "") + "};";               
        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "FileCompleteUpload", jscript, true); 
    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        // Do something that needs to be done such as refresh a gridView 
        // say you had a gridView control called gvMyGrid displaying all 
        // the files uploaded. Refresh the data by doing a databind here. 
        // gvMyGrid.DataBind(); 
        // Add some action
       
    } 

    
}