public void enableControlabc() { IEnumerable <Control> textboxControls = ViewUtils.GetAllControl(this, typeof(TextBox)); IEnumerable <Control> checkboxControls = ViewUtils.GetAllControl(this, typeof(CheckBox)); IEnumerable <Control> comboboxControls = ViewUtils.GetAllControl(this, typeof(ComboBox)); foreach (Control c in textboxControls) { ((TextBox)c).ReadOnly = false; } }