Session object question!

[Tony]

how do I check if the data in the session object is null before extracting it.
The following throws an error if the Session object has not already been
created.

string str = System.Web.HttpContext.Current.Session["abc"].ToString();

Thanks

[Sacha]

Hello...

You have to use an Object :

object o = System.Web.HttpContext.Current.Session["abc"] ;
string str = string.Empty ;

if (o != null)
str = o.ToString() ;

"Tony" <To**@discussions.microsoft.com> a écrit dans le message de
news:06**********************************@microsof t.com...

how do I check if the data in the session object is null before extracting it. The following throws an error if the Session object has not already been
created.

string str = System.Web.HttpContext.Current.Session["abc"].ToString();

Thanks

[Shiva]

if (Session["abc"] == null)
{
// abc is null
}
else
{
// Use abc
}

"Tony" <To**@discussions.microsoft.com> wrote in message
news:06**********************************@microsof t.com...
how do I check if the data in the session object is null before extracting
it.
The following throws an error if the Session object has not already been
created.

string str = System.Web.HttpContext.Current.Session["abc"].ToString();

Thanks

[Tony]

Thanks - I new it would be an easy answer!!!
"Sacha" wrote:

Hello...

You have to use an Object :

object o = System.Web.HttpContext.Current.Session["abc"] ;
string str = string.Empty ;

if (o != null)
str = o.ToString() ;

"Tony" <To**@discussions.microsoft.com> a écrit dans le message de
news:06**********************************@microsof t.com...

how do I check if the data in the session object is null before extracting

it.

The following throws an error if the Session object has not already been
created.

string str = System.Web.HttpContext.Current.Session["abc"].ToString();

Thanks

[Kevin Spencer]

> Thanks - I new it would be an easy answer!!!

Unfortunately, that was a klugy answer. You don't have to create an object
variable. All you need to do is test if the value is null before attempting
to assign it to a typed variable. Example:

string str; // declare your string
variable.
if (Session["abc"] != null) // Check if Session reference is null
str = (string) Session["abc"]; // Cast the Session object as a string
(or whatever it is) and assign it

This is much more efficient code. Also, it will work with any data type
stored in Session. Just change the cast.

--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
I get paid good money to
solve puzzles for a living
"Tony" <To**@discussions.microsoft.com> wrote in message
news:DA**********************************@microsof t.com...

Thanks - I new it would be an easy answer!!!
"Sacha" wrote:

Hello...

You have to use an Object :

object o = System.Web.HttpContext.Current.Session["abc"] ;
string str = string.Empty ;

if (o != null)
str = o.ToString() ;

"Tony" <To**@discussions.microsoft.com> a écrit dans le message de
news:06**********************************@microsof t.com...

how do I check if the data in the session object is null before extracting

it.

The following throws an error if the Session object has not already

been created.

string str = System.Web.HttpContext.Current.Session["abc"].ToString();

Thanks