Using ViewState for a ShoppingCard? RSS

• • Reply
  

  Jelmer850i

  Member

  232 Points

  1053 Posts

  Using ViewState for a ShoppingCard?

  Mar 18, 2009 11:23 AM|LINK

  Hi, i'm bulding a webshop.
  Right now the products are in the webshop but i need to add some to the shopping card.
  
  It should be possible to fill the webhop without loggin in in the webshop.
  So i thought, using ViewState.
  And build this:

   

  protected void Page_Load(object sender, EventArgs e)
      {
          try
          {
              //Get ViewState            
              if (ViewState["ShoppingCardID"] == null)
                  ViewState["ShoppingCardID"] = CreateShoppingCardID();
  
  
              if ((Request.QueryString["productid"] != null) && (Request.QueryString["aantal"] != null))
              {
                  //Add Item to shoppingcard
                  int ProductID = int.Parse(Request.QueryString["productid"]);
                  int Count = int.Parse(Request.QueryString["aantal"]);
                  addItem(ProductID, Count);
              }
              Bind();
          }
          catch (Exception ex)
          {
              lblError.Text = ex.ToString();
              lblError.Visible = true;
          }
      }
  
  
      protected void Bind()
      {
          repWinkelwagentje.DataSource = webshop.getShoppingCard(ViewState["ShoppingCardID"].ToString());
          repWinkelwagentje.DataBind();
      }
  
  
      protected void addItem(int ProductID, int Count)
      {
          webshop.AddShoppingCard(ViewState["ShoppingCardID"].ToString(), ProductID, Count);
      }

    

  So first he checks if there is a viewstate, there is no viewstate.
  He makes a new Unique ID, and he checks if there is a product id and a count.
  If its there he adds it to the database.
  
  But if i come back on this page, the ViewState is gone...
  Is the methode i use nog ok ?
  I thought the viewstate is available till you close the browser ?

   

  • Moved by ecbruck on Mar 18, 2009 12:11 PM
• • Reply
  

  arvind.kango...

  Member

  62 Points

  11 Posts

  Re: Using ViewState for a ShoppingCard?

  Mar 18, 2009 12:22 PM|LINK

  hi, ViewState is available till the time you are in the same page. if you redirect to other page and then once again come back to that page ViewState will loose the value it have. you can use something like session/cookie to store the value depending upon the security parameters. Thanks,

  view state

  -Arvind.
  Ramp Technology Group.
  • Marked as answer by Shengqing Yang - MSFT on Mar 24, 2009 03:22 AM
• • Reply
  

  Jelmer850i

  Member

  232 Points

  1053 Posts

  Re: Using ViewState for a ShoppingCard?

  Mar 18, 2009 12:47 PM|LINK

  Ok! is that it.
  I go using sessions thnx