adding method to class file

 public void disableFormcontrols(Control parent)// 
        {
            foreach (Control c in parent.Controls)
            {
                if (c.Controls.Count > 0)
                {
                    disableFormcontrols(c);
                }
                else
                {
                    switch (c.GetType().ToString())
                    {
                        case "System.Web.UI.WebControls.Text.Trim()Box":
                            ((TextBox)c).ReadOnly = true;
                            break;
                        case "System.Web.UI.WebControls.CheckBox":
                            ((CheckBox)c).Enabled = false;
                            break;
                        case "System.Web.UI.WebControls.RadioButton":
                            ((RadioButton)c).Enabled = false;
                            break;
                        case "System.Web.UI.WebControls.DropDownList":
                            ((DropDownList)c).Enabled = false;
                            break;

                        case "System.Web.UI.WebControls.Button":
                            cmdsave.Enabled  = false;
                            break;


                    }
                }
            }
        }

i tried using the same in my .aspx file using private instead of public

but there is no change in text controls

except the button control which gets disabled

i have the namespace