loner_li 机试题 编程遍历所有的Textbox控件 ，设置其值为空

namespace 编程遍历所有的Textbox控件
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            foreach (Control  control in this.Controls)
            {
                if (control is TextBox)
                {
                    TextBox tb = (TextBox)control;
                    tb.Text = string.Empty;
                }
            }
        }

    }
}