How to download amazon s3 in use C#?

using System;
using System.IO;


namespace ConsoleApplication1
{
    
        public partial class AmazonS3
        {
            public object FileUpload1 { get; private set; }
            public object Response { get; private set; }

            protected void Page_Load(object sender, EventArgs e)
            {

            }

            protected void upload(string myBucketName, string accessKey ,
                string secretKey,)
            {
            }

  
                Stream st = FileUpload1.PostedFile.InputStream;

                string name = Path.GetFileName(FileUpload1.FileName);
                string myBucketName = "";
                string accessKey = "";
                string secretKey = "";
                bool a;
                AmazonUploader myUploader = new AmazonUploader();
                a = myUploader.sendMyFileToS3(st, accessKey, secretKey);
                if (a == true)
                {
                    Response.Write("successfully uploaded");

                }
                else
                    Response.Write("Error");
            }
        }



    }