遍历页面上所有TextBox控件并给它的Enabled赋值为false

private void FindSelecedControl(Control control)
{
if (control is TextBox)
{
            TextBox txt = (TextBox)control;
            txt.Enabled = false;
        }
else
{
for (int i = 0; i < control.Controls.Count; i++)
{
                FindSelecedControl(control.Controls[i]);
            }
        }
    }

页面调用方法：

   foreach (Control control1 in this.Form.Controls)
            {
                FindSelecedControl(control1);
            }