关于dropdownlist控件后台代码整合
以下是我的代码哦，我总感觉重复性好多，希望大家能帮我把代码整合下，我也好参考学习一下哦
string strCon = ConfigurationManager.AppSettings["MsSql"];
        protected void Page_Load(object sender, EventArgs e)
        {
         if (!IsPostBack)
            {
                BindUserList();

                ddlGroupIDBind();
                ddlU_CNameBind();
                ddlUserIDBind();

            }
        }
//部门下拉框
        protected void ddlGroupIDBind()
        {
            string sqlSel = "select  GroupID,G_CName from sys_Group where G_ParentID !=0  order by GroupID ";
            SqlConnection con = new SqlConnection(strCon); ;
            con.Open();
            SqlDataAdapter sda = new SqlDataAdapter(sqlSel, con);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            ddlGroupID.DataSource = ds.Tables[0].DefaultView;
            ddlGroupID.DataTextField = "G_CName";
            ddlGroupID.DataValueField = "GroupID";
            ddlGroupID.DataBind();
        }
        //员工姓名下拉框
        protected void ddlU_CNameBind()
        {
            string sqlSel = "select UserID,U_CName from sys_User where U_GroupID='" + ddlGroupID.SelectedValue + "' order by UserID  ";