ASP.NET、WinForm - 判断整个页面文本框是否为空

foreach(Control ctrl in Page.Controls)

	{

		foreach(Control childc in ctrl.Controls)

		{

			switch(childc.GetType().ToString())

			{

				case "System.Web.UI.WebControls.TextBox" :

					TextBox txt = (TextBox)childc;

					txt.ReadOnly = true;

					break;

				case "System.Web.UI.WebControls.Label" :

					Label lbl = (Label) childc;

					break;

				case "System.Web.UI.WebControls.DropDownList" :

					DropDownList ddl = (DropDownList) childc;

					break;

			}

		}

	}