How to UnZip files in ASP.NET?

using Ionic.Zip;
using System.IO;

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

    }   
    //UnZip Process
    protected void BtnUnzip_Click(object sender, EventArgs e)
    {      
        //source location of zip file
        string sourceLocation = "D:\\images.zip";
        //After extract where placed that files
        string destLocation = "D:\\destfolder";
        //Conditional extract and placed in this folder
        string CondFiles = "D:\\condfolder";

        //Extract all files in the zip file
        using (ZipFile zip1 = ZipFile.Read(sourceLocation))
        {
            //Full file extract code
            foreach (ZipEntry e1 in zip1)
            {
                e1.Extract(destLocation, ExtractExistingFileAction.OverwriteSilently);
            }
            //Based on the conditions to extract
            foreach (ZipEntry e2 in zip1)
            {
                //Extract only txt files in extract folder
                if (e2.FileName.ToString().Substring((e2.FileName.LastIndexOf('.') + 1), (e2.FileName.ToString().Length - e2.FileName.LastIndexOf('.') - 1)) == "jpg")
                {
                    e2.Extract(CondFiles, ExtractExistingFileAction.OverwriteSilently);
                }
            }
        }
    }   
}