Dropdownlist_SelectedIndex, Aynı sorgu diğer tarafta çalışmıyor ?

    protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e) 
      { 
          SqlConnection baglanti = new SqlConnection("Server = CelalTR;Database=RentaCar;Integrated Security=true"); 
          if (DropDownList4.SelectedItem.Text == "Sedan") 
          { 
              SqlCommand sorgu = new SqlCommand("SELECT * FROM Arac Join Bedel On Arac.Arac_id = Bedel.Arac_id WHERE Arac_tipi='Sedan'", baglanti); 
              SqlDataAdapter veriAdaptoru = new SqlDataAdapter(sorgu); 
              DataTable veriTablosu = new DataTable(); 
              baglanti.Open(); 
              veriAdaptoru.Fill(veriTablosu); 
              baglanti.Close(); 
              DataList2.DataSource = veriTablosu; 
              DataList2.DataBind(); 
          } 
  }

    protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e) 
      { 
          SqlConnection baglanti = new SqlConnection("Server = CelalTR;Database=RentaCar;Integrated Security=true"); 
          if (DropDownList3.SelectedItem.Text == "AlfaRomeo") 
          { 
              SqlCommand sorgu = new SqlCommand("SELECT * FROM Arac Join Bedel On Arac.Arac_id = Bedel.Arac_id WHERE Marka='AlfaRomeo'", baglanti); 
              SqlDataAdapter veriAdaptoru = new SqlDataAdapter(sorgu); 
              DataTable veriTablosu = new DataTable(); 
              baglanti.Open(); 
              veriAdaptoru.Fill(veriTablosu); 
              baglanti.Close(); 
              DataList2.DataSource = veriTablosu; 
              DataList2.DataBind(); 
          } 
  }

    public void aracbilgileribul() 
      { 
          SqlConnection baglanti = new SqlConnection("Server = CelalTR;Database=RentaCar;Integrated Security=true"); 
          SqlCommand sorgu =  
          new SqlCommand("SELECT * FROM Arac INNER JOIN Bedel ON Arac.Arac_id = Bedel.Arac_id WHERE Arac.Marka='" + DropDownList3.Text + "' AND Arac.Model='" + DropDownList2.Text + "' AND Arac.Arac_tipi='" + DropDownList4.Text + "' AND Arac.YakitTipi='" + DropDownList5.Text + "' AND Arac.Yil BETWEEN '" + DropDownList6.Text + "' AND'" + DropDownList7.Text + "'", baglanti); 
          SqlDataAdapter veriAdaptoru = new SqlDataAdapter(sorgu); 
          DataTable veriTablosu = new DataTable(); 
          baglanti.Open(); 
          veriAdaptoru.Fill(veriTablosu); 
           
          DataList2.DataSource = veriTablosu; 
          DataList2.DataBind(); 
          int i = sorgu.ExecuteNonQuery(); 
          if (i != 1) 
          { 
              sonucgoster.Text = "Üzgünüz. Seçtiğiniz kriterlere göre bir araç listelenemiyor. Lütfen Tekrar Arama Yapınız."; 
          } 
          else 
              sonucgoster.Text = "Araç listelendi !"; 
          baglanti.Close(); 
      }