趴

private void deptlistconn() //dropdownlist databind
    {
        dt = sqlhelp.ExecuteDataTable("select dept FROM game_dept");
        distlist.DataValueField = "資料表欄位名稱";
        distlist.DataTextField = "資料表欄位名稱";
        distlist.DataSource = dt;
        distlist.DataBind();
    }

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protected void ddlCountry_Init(object sender, EventArgs e) //初始化dropdowlist
    {
        deptlistconn();
    }


-------------

public string chosedeldept() //判斷要刪除的項目
    {
        string mm = string.Empty;

        for (int s = 0; s < distlist.Items.Count; s++)
        {
            if (distlist.Items[s].Selected)
            {
                  mm = distlist.Items[s].Value;
            }

        }

        return mm;
    }

--------------
html原始檔中加入 OnInit="ddlCountry_Init"

<asp:DropDownList ID="distlist" runat="server" style="z-index: 1; left: 273px; top: 80px; position: absolute" 
             OnInit="ddlCountry_Init">

以上資料部份參考 http://ppt.cc/LF1_