if (!IsPostBack)
    {
        //繝ｩ繝吶Ν縺ｫ譁?ｭ励ｒ陦ｨ遉ｺ縺輔○繧?
        this.Label1.Text = "縺翫＞縲∵仂鬟ｯ陦後￥縺槭??;

        //讌ｭ遞ｮ諠??ｱ繧貞叙蠕励☆繧偽RL繧堤畑諢?
        string LargeCategoryUrl = "http://api.gnavi.co.jp/ver1/CategoryLargeSearchAPI/?keyid={0}";

        //蜿門ｾ励＠縺溘い繧ｯ繧ｻ繧ｹ繧ｭ繝ｼ繧堤畑諢?
        string AccessKey = "?懷叙蠕励＠縺溘い繧ｯ繧ｻ繧ｹ繧ｭ繝ｼ??;

        //讌ｭ遞ｮ諠??ｱ繧貞叙蠕励☆繧偽RL縺ｮ{0}縺ｮ驛ｨ蛻?ｒaccess_key縺ｮ譁?ｭ怜?縺ｫ鄂ｮ謠?
        LargeCategoryUrl = String.Format(LargeCategoryUrl, AccessKey);

        //讌ｭ遞ｮ縺ｮ隱ｭ縺ｿ霎ｼ縺ｿ
        XmlTextReader readerLcat = new XmlTextReader(LargeCategoryUrl);

        //繝??繧ｿ繧ｻ繝?ヨ蝙九?蜈･繧檎黄繧堤畑諢?
        DataSet dsLcat = new DataSet();

        //繝??繧ｿ繧ｻ繝?ヨ縺ｫ讌ｭ遞ｮ繧偵そ繝?ヨ
        dsLcat.ReadXml(readerLcat);

        //繝峨Ο繝??繝?繧ｦ繝ｳ繝ｪ繧ｹ繝医↓讌ｭ遞ｮ繧偵そ繝?ヨ縺励◆繝??繧ｿ繧ｽ繝ｼ繧ｹ繧偵そ繝?ヨ
        this.DropDownList2.DataSource = dsLcat;
        this.DropDownList2.DataTextField = "category_l_name";
        this.DropDownList2.DataValueField = "category_l_code";
        this.DropDownList2.DataBind();
    }