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========================================== FrmDropDownList_PhoneNumber.aspx ========================================== <%@ Page Language="C#" AutoEventWireup="true" CodeFile="FrmDropDownList_PhoneNumber.aspx.cs" Inherits="FrmDropDownList_PhoneNumber" %>

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========================================== FrmDropDownList_PhoneNumber.aspx.cs ========================================== using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class FrmDropDownList_PhoneNumber : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // 현재 페이지가 포스트백(재전송)이 아닐 때에만 바인딩, 즉, 처음 로드시에만 처리 if (!Page.IsPostBack) { ddlPhoneNumber.Items.Add("017"); ddlPhoneNumber.Items.Add(new ListItem("016", "016")); } } protected void btnClick_Click(object sender, EventArgs e) { this.lbPhoneNumber.Text = this.ddlPhoneNumber.SelectedValue; } }