string resourceName = "ErciyesCommon.Components.MyControl.js";

            ScriptManager manager = ScriptManager.GetCurrent(this.Page);
            if ((manager != null) && manager.IsInAsyncPostBack)
            {
                Type smType  = manager.GetType();
                MethodInfo RegisterClientScriptResourceMethod = smType.GetMethod("RegisterClientScriptResource", new Type[3] { typeof(WebControl), typeof(Type), typeof(string) });
                if (RegisterClientScriptResourceMethod != null)
                {
                    RegisterClientScriptResourceMethod.Invoke(null, new object[3] { this, this.GetType(), resourceName });
                }
            }
            else
            { 
                ClientScriptManager cs = this.Page.ClientScript;
                cs.RegisterClientScriptResource(typeof(ErciyesCommon.Components.LookupBox.LookupBox), resourceName);
            }