Checking session if empty or not

Question

I want to check that session is null or empty i e  some thing like this   if Session  emp num      null        if   string IsNullOrEmpty Session  emp num   ToString                                     The code                     Or just   if Session  emp num      null                   The code         because sometimes when i check only with          if   string IsNullOrEmpty Session  emp num   ToString                                             The code                     I face the following exception      Null Reference exception

User · Answer

if  HttpContext Current Session  emp num      null            code if session is not null      if at all above fails

User · Answer

You need to check that Session  emp num   is not null before trying to convert it to a string otherwise you will get a null reference exception   I d go with your first example - but you could make it slightly more  elegant    There are a couple of ways  but the ones that springs to mind are   if  Session  emp num   is string        or   if   string IsNullOrEmpty Session  emp num   as string         This will return null if the variable doesn t exist or isn t a string

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If It is simple Session you can apply NULL Check directly Session  emp num      null  But if it s a session of a list Item then You need to apply any one of the following option  Option 1    if    List lt int gt   Session  emp num        null  amp  amp   List lt int gt  Session  emp num     Count  gt  0        Your Logic here      Option 2   List lt int gt  val  Session  emp num   as List lt int gt      Get the value from Session   if  val FirstOrDefault      null        Your Logic here

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Use this if the session variable emp num will store a string    if   string IsNullOrEmpty Session  emp num   as string                        The code      If it doesn t store a string  but some other type  you should just check for null before accessing the value  as in your second example

User · Answer

Check if the session is empty or not in C  MVC Version Lower than 5    if   string IsNullOrEmpty Session  emp num   as string           cast it and use it       business logic        Check if the session is empty or not in C  MVC Version Above 5    if Session  emp num      null          cast it and use it       business logic

User · Answer

You should first check if Session  emp num   exists in the session   You can ask the session object if its indexer has the emp num value or use string IsNullOrEmpty Session  emp num

[c#] Checking session if empty or not

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