protected void Page_Load(object sender, EventArgs e) { private string selectCourse; if (!IsPostBack) { TextBox1.Text = "20"; TextBox2.Text = "80"; } selectCourse = DropDownList1.SelectedItem.Value; } protected void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e) { if (selectCourse == DropDownList1.SelectedItem.Value) { return; } else { selectCourse = DropDownList1.SelectedItem.Value; } }
原文:http://www.cnblogs.com/niexianxue/p/4433387.html