清空所有文本框的值

protected void ClearControl(ControlCollection ct)
    {
        foreach (Control ctl in ct)
        {
            if (ctl is TextBox)
            {
                TextBox t = (TextBox)ctl;
                t.Text = string.Empty;
            }
            if (ctl.HasControls())
            {
                ClearControl(ctl.Controls);
            }
        }
    } 

 /// <summary>
    /// 隐藏textbox
    /// </summary>
    /// <param name="ct"></param>
    protected void VisibleControl(ControlCollection ct)
    {
        foreach (Control ctl in ct)
        {
            if (ctl is TextBox)
            {
                TextBox t = (TextBox)ctl;
                t.Visible = false;
            }
            if (ctl.HasControls())
            {
                VisibleControl(ctl.Controls);
            }
        }
    }

ClearControl(this.Controls);