重置整个FORM控件的值

 protected void Page_Load(object sender, EventArgs e)
        ...{
            foreach (Control ctl in Page.Controls[0].Controls)
            ...{
                if (ctl.GetType().Name == "TextBox")
                ...{
                    TextBox tb = new TextBox();
                    tb = (TextBox)this.FindControl(ctl.ID);
                    tb.Text = "";
                }
            }
        }

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