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.NET Forum / ASP.NET / General / October 2007HttpContext.Current.Session==null in .cs file
Hello, I have created ASP.NET project in which I have a file Admin.cs. It contains static class Admin with some methods and properties. The problem is that in property get a reference HttpContext.Current.Session is null, although for instance HttpContext.Current.Application or HttpContext.Current.Request is not null: public static class Admin { ... set { HttpContext.Current.Session["Database"] = value; // HERE OK } get { object db = HttpContext.Current.Session["Database"]; // HERE PROBLEM if (db == null) return null; return db.ToString(); } ... } Could anyone explain me why? How to use Session object in my code? /RAM/ > Hello, > I have created ASP.NET project in which I have a file Admin.cs. It contains [quoted text clipped - 36 lines] > Could anyone explain me why? How to use Session object in my code? > /RAM/ Have you debugged the code and verified that it's actually the reference to the Session object that is null, and not simply that the Items collection doesn't contain the key "Database"?  SignatureGöran Andersson _____ http://www.guffa.com > Have you debugged the code and verified that it's actually the reference > to the Session object that is null, and not simply that the Items > collection doesn't contain the key "Database"? Yes, I debugged the code. HttpContext.Current.Application, HttpContext.Current.Cache, HttpContext.Current.Response, HttpContext.Current.Request are not null, they reference valid object. Only HttpContext.Current.Session is null. It looks strange for me, so I have sent the post. Could you help me? /RAM/ I have forgotten to add: I changed web server from IIS 5.1 to Cassini 2. Generally Cassini works fine, but maybe that's the reson why Session doesn't work... I cannot use IIS because I had interal error in IIS and I failed to solve the problem. /RAM/ >I have forgotten to add: I changed web server from IIS 5.1 to Cassini 2. >Generally Cassini works fine, but maybe that's the reson why Session >doesn't work... I cannot use IIS because I had interal error in IIS and I >failed to solve the problem. No, that's not the reson. I have learnt that Cassini supports Session object. /RAM/ >> Have you debugged the code and verified that it's actually the reference >> to the Session object that is null, and not simply that the Items [quoted text clipped - 7 lines] > Could you help me? > /RAM/ In your code you indicated that the Session object existed when you set the session variable, but not when you read it? It doesn't make sense that the existance of the Session object would be different depending on if you try to read or write a value. Where do you use the property? When does the Session object exist? The web site can have session state enabled or disabled, but that is a global setting for the site. If disabled, there won't be any Session objects at all. SignatureGöran Andersson _____ http://www.guffa.com > In your code you indicated that the Session object existed when you set > the session variable, but not when you read it? It doesn't make sense that > the existance of the Session object would be different depending on if you > try to read or write a value. Where do you use the property? When does the > Session object exist? I use set/get in code-behind of Default.aspx. > The web site can have session state enabled or disabled, but that is a > global setting for the site. If disabled, there won't be any Session > objects at all. I have session enabled in my web.config: <sessionState mode="InProc" timeout="20" /> >> In your code you indicated that the Session object existed when you set >> the session variable, but not when you read it? It doesn't make sense that >> the existance of the Session object would be different depending on if you >> try to read or write a value. Where do you use the property? When does the >> Session object exist? > I use set/get in code-behind of Default.aspx. When does the Session object exist? >> The web site can have session state enabled or disabled, but that is a >> global setting for the site. If disabled, there won't be any Session >> objects at all. > I have session enabled in my web.config: > <sessionState mode="InProc" timeout="20" /> If the session state is disabled in IIS, the setting in web.config doesn't have any effect. SignatureGöran Andersson _____ http://www.guffa.com > When does the Session object exist? I am not sure if I understand you... I can use Session from Default.aspx in Admin...get. In Admin...set it is not accessible. > If the session state is disabled in IIS, the setting in web.config doesn't > have any effect. I don't use IIS, because it didn't work on my computer. I use Cassini v2 on Windows XP Professional. >> When does the Session object exist? > I am not sure if I understand you... I can use Session from Default.aspx in > Admin...get. In Admin...set it is not accessible. That doesn't make sense at all. Can you show the code that is using the properties? >> If the session state is disabled in IIS, the setting in web.config doesn't >> have any effect. > I don't use IIS, because it didn't work on my computer. I use Cassini v2 on > Windows XP Professional. Which should have the corresponding setting. SignatureGöran Andersson _____ http://www.guffa.com > That doesn't make sense at all. But it's true. > Can you show the code that is using the properties? Here you are (property Admin.CurrentDatabase): public partial class DefaultPage : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { // Display message: if (Session["Message"] != null) MessageLabel.Text = Session["Message"].ToString(); else MessageLabel.Text = String.Empty; // Display error: if (Session["Error"] != null) ErrorLabel.Text = Session["Error"].ToString(); else ErrorLabel.Text = String.Empty; // Setting up the database: if (Admin.CurrentDatabase == null) { Admin.CurrentDatabase = (Admin.CurrentUserName == Admin.DemoUser ? Admin.DemoDatabase: Admin.DefaultDatabase); if (Admin.CurrentDatabase != null) { Admin.ClearLog(); Admin.WriteToLog(Resources.MIM_Magazyn.SelectedDatabase + ": " + Admin.CurrentDatabase); } else { Session["Error"] = Resources.MIM_Magazyn.CannotSetupDatabase; Response.Redirect("Error.aspx"); } } } } } >> That doesn't make sense at all. > But it's true. [quoted text clipped - 22 lines] > { > Admin.CurrentDatabase = (Admin.CurrentUserName == So the Session object is not null here? > Admin.DemoUser ? > Admin.DemoDatabase: > Admin.DefaultDatabase); > if (Admin.CurrentDatabase != null) But here? > { > Admin.ClearLog(); [quoted text clipped - 12 lines] > } > } If that is in fact true, then your installation is not capable of running applications. It's seriously broken, and in need of repair or reinstallation. SignatureGöran Andersson _____ http://www.guffa.com I have learnt that accessibilty of HttpContext.Current.Session may depend on the place I use Admin...get. But in my project it is Default.aspx page (startup), method Page_Load (code-behind). So I have a question: should HttpContext.Current.Session be accessible in this place? /RAM/ > I have learnt that accessibilty of HttpContext.Current.Session may depend on > the place I use Admin...get. There is only a HttpContext if the code is executed to handle a request. The Application_End event for example is not executed to handle a request, and doesn't have a HttpContext. > But in my project it is Default.aspx page (startup), method Page_Load > (code-behind). So I have a question: should HttpContext.Current.Session be > accessible in this place? Yes. If session state is enabled for the site. SignatureGöran Andersson _____ http://www.guffa.com > Yes. If session state is enabled for the site. I haven't disabled session state for the site. I even don't know how to do it. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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