protected void submit_Click(object sender, EventArgs e)
 {
     String user;
     WebServeur.ImageTransfertClient client = new WebServeur.ImageTransfertClient();
     if(client.checkLogin((user=userName.Text),password.Text))
     {
         resultat.Text = String.Format("Welcome,{0}!You have these albums.You can choose the album to show it.", user);
         Label2.Visible = false;
         userName.Visible = false;
         Label3.Visible = false;
         password.Visible = false;
         submit.Visible = false;
         String[] albums = client.getUserAlbum(user);
         for (int i = 0; i < albums.Length; i++)
         {
             System.Web.UI.WebControls.ListItem item = new System.Web.UI.WebControls.ListItem();
             albumList.Items.Add(item);
             item.Text = albums[i];
         }
     }
     else
     {
         resultat.Text = String.Format("user doesn't exist or password isn't correct.");
     }
 }