DropDownList içindeki verilerin özelliklerinin textboxa yazılması

var Uyeler = (from u in db.Uye 
                            where u.IsActive == true && u.IsDelete == false && u.Durum == 1 
                            orderby u.UyeAdi ascending 
                            select new 
                            { 
                                UyeAdi = u.UyeAdi + " " + u.UyeSoyadi, 
                                UyeId = u.UyeId 
                            }).ToList(); 
              DDL_Uyeler.DataSource = Uyeler; 
              DDL_Uyeler.DataBind();

 
  if (!IsPostBack) 
  { 
                  BindDropDown(); 
  } 
  

 
          protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) 
          { 
              OleDbConnection connection; 
              connection = new OleDbConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["xls"].ConnectionString); 
              connection.Open(); 
              OleDbCommand command = new OleDbCommand("SELECT * FROM [TABLE1$] WHERE ID = " + DropDownList1.SelectedValue + "", connection); 
              OleDbDataReader dr = command.ExecuteReader(); 
   
              while (dr.Read()) 
              { 
                  TextBox1.Text = dr["SOYAD"].ToString();  
                  TextBox2.Text = dr["YAS"].ToString();  
              } 
              connection.Close(); 
          }