Unable to fetch cookie value

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ASP.NET

Android

Eclipse

I want to develop an app which write some value in cookies (and update periodically), and on web page (using webview) there is a button, by clicking the button it will show the cookie value. I found lots of solution, but none of them solve my issue. I am not getting require cookie value.

Thanks in advance.

What I have tried:

On My App:

public class MainActivity extends Activity 
{
  private Handler MyHandler = new Handler();

  protected void onCreate(Bundle savedInstanceState) 
  {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        WebView  wv1 =( WebView)findViewById(R.id.webView1);
        wv1.getSettings().setLoadsImagesAutomatically(true);
        wv1.getSettings().setJavaScriptEnabled(true);
        String url = "https://abcd.com";          
        wv1.loadUrl(url);
        MyHandler .postDelayed(MyThread, 0);
        CookieManager.getInstance().setAcceptThirdPartyCookies(wv1, true);    
  }

  private Runnable MyThread = new Runnable() 
  {

        public void run() 
        {
            Update_Value(); 

            MyHandler.postDelayed(this, 10000);
        }

  };    

  private void Update_Value()
  {
    String _Value= Get_Value();

    CookieSyncManager.createInstance(this);
    CookieManager cookieManager = CookieManager.getInstance();
    cookieManager.setAcceptCookie(true);
    cookieManager.setCookie("MyValue", _Value);
    CookieSyncManager.getInstance().sync();
    //?cookieManager.flush();
  }  
}

On Web Page - https://abcd.com/default.aspx (ASP.Net)

protected void btn_ShowValue_Click(object sender, EventArgs e)
{
  object _Value = Response.Cookies["MyValue"].Value;

  if (_Value != null) txt_Result.Text = "Result : " + _Value.ToString();
  else txt_Result.Text = "Value not found";
}