Problem using sessions - "An object reference is required"

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I have a button that when I click this method is executed (after JS - ajax):

C#

[System.Web.Services.WebMethod]
   public static string carregarNotas()
   {
       try
       {
           string id;
           id = Session["weeksLength"].ToString();
           string user = Session["username"].ToString();

//.........

The problem is, I get "An object reference is required". If I place that id = ... on page_load I dont get this problem.

How can I solve this problem? I execute an SQL statement in this method and I need that session variable.

thanks in advance.

Posted 22-Dec-10 7:11am

Maxdd 7

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Not Active · Answer 1 · 2010-12-22T07:21:00

Solution 2

It usually helps when you read the documentation.

http://msdn.microsoft.com/en-us/library/ykshe9s9.aspx[^]

Parameters

enableSession
Type: System.Boolean
Initializes whether session state is enabled for the XML Web service method.

Without this the Session object is not valid.

Posted 22-Dec-10 7:21am

Not Active

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Maxdd 7 22-Dec-10 13:26pm

That dont work either inside a static method.

Maxdd 7 · Answer 2 · 2010-12-22T07:23:00

Solution 3

As I said, my own answer and the explanation:

The problem is that the Session object is a non static member of the Page/Control class that I was using.

So I have to use:

C#

static void testStaticFunc()
{
  HttpContext.Current.Session["test"] = "testString";
}

And it works.

Thanks anyway.

Posted 22-Dec-10 7:23am

Maxdd 7

Comments

[no name] 22-Dec-10 15:42pm

You didn't specify you were calling this from a Page. Could have been a webservice method, in which case you would need the enableSession variable.

Maxdd 7 23-Dec-10 0:29am

Yes you right, thanks :)