强大的viewstate功能

我在page_Load中加入了一些控件，如下：

TextBox txtBox = new TextBox();
txtBox.ID = "name";
txtBox.Text = "haha";

CheckBox ckBox = new CheckBox();
ckBox.ID = "ffff";

DropDownList ddlList = new DropDownList();
ddlList.ID = "gggg";
ddlList.Items.Add(new ListItem("111", "111"));
ddlList.Items.Add(new ListItem("222", "222"));
ddlList.Items.Add(new ListItem("333", "333"));

form1.Controls.Add(txtBox);
form1.Controls.Add(ckBox);
form1.Controls.Add(ddlList);

当在当前页面点按钮后，之前输入的值会保存在页面上显示