Get value of HTML Input Hidden field with runat=server using jQuery in ASP.Net

I am working  with a application in which I assign a value to hidden field dynamically problem is that I am not able to get the value in jquery code.

I will debug it and C# code give me value now I am not able to use this hidden field value in jquery code  please help me to solve my problem.follwing my code

C# Code

[webmethod]
public static void Data(string add)
    {
ObjectParameter Test;
        Test = new ObjectParameter("id", typeof(Int32));
        Test.Value = DBNull.Value;
        using (var db = new MyEntities())
        {
db.Mytest(

                 Add = add,
                Test
                 );
            HiddenField myhiiden = new HiddenField();
            myhiiden.Value = Convert.ToString(Test.Value);//// here I got id value when I debug it it dynamically change but I have no method to assign and excess these value plese help me following my method to access these value in jquery function.
      
        }



}

JQuery

myhiiden = $("[ myhiiden]").val();
  alert($('[myhiiden]').val());  but I can’t got any value

 my hidden filed definition
  <input runat="server" type="hidden" value="" id=" myhiiden " ClientIDMode="Static" />

Please help me how I use this hidden field in jqury and get on alert.