How to access Application variable in Web Service WebMethod in ASP.Net

I have a class (Msg.cs) with below properties:

private string _senderuser;
    private string _message;
    private string _receiveruser;

    public string senderuser
    {
        get
        {
            return _senderuser;
        }
        set
        {
            _senderuser = value;
        }
    }

    public string message
    {
        get 
        {
            return _message;
         
        }
        set 
        {
            _message = value;
        }
    }

    public string receiveruser
    {
        get 
        {
            return _receiveruser;
        }
        set 
        {
            _receiveruser = value;
        }
    }

I have a MasterPage (Master.master.cs) in which I created above class object, and passed this class into 'Dictionary'. And in the end 'Dictionary' is passed into 'Application variable'. As below:

Msg msgObject = new Msg();
msgObject.message = txtMsg.Text;
msgObject.senderuser = m_user.ToString();

foreach (ListItem li in lst_Users.Items)
{
   if (li.Selected)
   {
       msgObject.receiveruser = li.Value;
   }
}

Dictionary<int, Msg> obj = new Dictionary<int, Msg>();
obj.Add(i++, msgObject);

Application["Message"] = obj;

Again, I have a .asmx(web service) page in which I want to call same 'Application variable' defined in above Master page and then I want to fetch top 5 records from 'Dictionary' defined in above Master page. Please reply how to do it.

I am unable to call 'Dictionary' and 'Application variable' of master page into .asmx page

Please reply