How to persist an Dictionary object on pageload

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How to persist Dictionary object on pageload .
My code is

C#

 public partial class abc : System.Web.UI.Page
{
        
        Dictionary<string, string> CategoryList = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            cm = new CommonMethods();
         
            CategoryList = cm.GetCategory();
    
            if (!IsPostBack)
            {

                DDLCategory.DataSource = CategoryList.Values;
                DDLCategory.DataBind();
            }
        }
}

It is working fine but when I write code like this

C#

if (!IsPostBack)
{
    CategoryList = cm.GetCategory();
    DDLCategory.DataSource = CategoryList.Values;
    DDLCategory.DataBind();
}

CategoryList is null(after first time pageload) and for this I using session object.
I want to know that make session object is correct or not if not then what should I do?

Posted 4-Dec-13 18:46pm

Member 7909353

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Comments

piyush_singh 5-Dec-13 8:27am

If the value of the dropdownlist is not affected by postback, then you should definitely set its datasource only once inside the !ISPostBack. Now since, on each postback, the whole page is rendered, you need to store your custom values (such as Dictionary in this case) somewhere. That's where comes, Sessions & ViewStates. If you want to persist your data across multiple pages then, use Session. If you want to hold the value as long as the current page is active then, use ViewState. So that the values will be cleared when the user navigates to some other pages. Since session variables remains active as long as the current session is active it is usually advised not to keep heavy objects in it as it will slow down your application.

Member 7909353 5-Dec-13 23:36pm

I am using session, but want to know another way if any.

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