Test if Session Variable Exists!!

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Adam J Knight - 17 Feb 2006 09:48 GMT

Hi all,

I am trying to test to see if a Session variable exists.

This was my initial attempt, and doesn't work
int intInstructorID = (Session["InstructorID"].ToString() == null ?
Convert.ToInt32(Request.QueryString["InstructorID"]):
Convert.ToInt32(Session["InstructorID"]));

Can anyone give me a head up on the best way to do this??

Cheers,
Adam

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kahtava@gmail.com - 17 Feb 2006 10:24 GMT

You've got it..

Perhaps avoid the use of the ternary operator for readability sake, but
then again you may get better performance from short circuiting the
ternary if statement.

I would suggest sticking to either session variables or query strings;
in the end it makes life easier.

if( Session["InstructorID"] != null ){
Convert.ToInt32(Request.QueryString["InstructorID"]):
}
else{
Convert.ToInt32(Request.QueryString["InstructorID"]):
}

I found that through URL ReWriting I could get the functionality I
desired with session variables through the use of query strings.

Cheers,
-Adam

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Ravi Ambros Wallau - 17 Feb 2006 12:32 GMT

Perhaps:

if( Session["InstructorID"] != null ){
Convert.ToInt32(Session["InstructorID"]):
}
else{
Convert.ToInt32(Request.QueryString["InstructorID"]):
}

> You've got it..
>
[quoted text clipped - 17 lines]
> Cheers,
> -Adam

Reply to this Message

Hans Kesting - 17 Feb 2006 11:32 GMT

> Hi all,
>
[quoted text clipped - 9 lines]
> Cheers,
> Adam

The test 'Session["InstructorID"].ToString() == null' will fail
if Session["InstructorID"] is null, because then there is nothing to
call ToString() on. Remove the ToString and it should work (*if* you
are sure that either the Session or the QueryString delivers something
that can be converted into string).

int intInstructorID = (Session["InstructorID"] == null ?
Convert.ToInt32(Request.QueryString["InstructorID"]):
Convert.ToInt32(Session["InstructorID"]));

Hans Kesting

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Test if Session Variable Exists!!

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