遍历aspx页面中所有的指定控件

//1.遍历页面中所有的TextBox,并将值设置成String.Empty

 for (int j = 0; j < this.Controls.Count; j++)
{
      foreach (object o in Page.Controls[j].Controls)
      {

          if (o is TextBox)
         {
             TextBox txt = (System.Web.UI.WebControls.TextBox)o;
             txt.Text = String.Empty;
         }
     }
}

//2.递归遍历

 private void FindAllTextBoxByPageControl(ControlCollection controlCollection)
{
    for (int i = 0; i < controlCollection.Count; i++)
    {
            if (controlCollection[i].GetType() == typeof(TextBox))    //System.Web.UI.WebControls.TextBox
            {
                (controlCollection[i] as TextBox).Text = String.Empty;
            }
            if (controlCollection[i].HasControls())
            {
                //递归 (重要) 否则将退出程序
                FindAllTextBoxByPageControl(controlCollection[i].Controls);
            }
    }
 }

//调用方法

 FindAllTextBoxByPageControl(Page.Controls);