Question

I have a class level price variable decalred inside a page, like this:

public partial class _Default : System.Web.UI.Page 
{
    private MyClass myVar = new MyClass();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            myVar.LoadData();
            myVar.ShowData();
        }
    }

    protected void cmdRefresh_Click(object sender, EventArgs e)
    {
        myVar.ShowData();
    }
}

The problem I have is that after the initial load, the first time that the button is pressed it seems to reset myVar, and all its data is lost. Is this a known issue with ASP.NET and is there a workaround?

Answer 1

Use the ViewState to store the class, if you just need to save the classfor the current page. IF you want to save it for the entire site, then look into things like Sessions.

private MyClass myClass
{
    get {
      if (this.ViewState["myVar"] != null)
      {
           return (MyClass)this.ViewState["myVar"];
      }
    }
set{
     this.ViewState["myVar"] = value;
}
}