Access asp controls inside a public static method

Question

I have a Asp form.in my code i have a static method i want to access the page controls Inside the static method.Suggest some ideas..

[System.Web.Services.WebMethod]
 public static Dictionary<string, object> LoadAssetAssignView()
       {
      datetime mydate=datetime.parse(TextBox1.Text);//Can't access the form control
      .
      .
      .
      .
      .
       }