Reading from web.config

[arun1985]

Is it correct to read from web.config file in the following way? i am using asp.net 2.0 VS 2005.I get the following error

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullRefe renceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[NullReferenceEx ception: Object reference not set to an instance of an object.]
anmar.SharpWebM ail.UI.Login.Lo gin_Click(Objec t sender, EventArgs args) in login.cs:75
System.EventHan dler.Invoke(Obj ect sender, EventArgs e) +0
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e) +105
System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String eventArgument) +107
System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ostBackEvent(St ring eventArgument) +7
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler sourceControl, String eventArgument) +11
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData) +33
System.Web.UI.P age.ProcessRequ estMain(Boolean includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint) +5102


The point where the error is shown is

int login_mode = (int)Applicatio n["sharpwebma il/login/mode"];

Are application variables available in asp.net 2.0

[Plater]

Values stored in web.config are generally accessed like this:

Code:

private static AppSettingsReader ap = new AppSettingsReader();
public static int SitesPerGrouping
    {
        get
        {
            return (int)ap.GetValue("SitesPerGrouping", typeof(int));
        }
    }

web.config

<configuration>
	<appSettings>
		<add key="SitesPerGrouping" value="500"/>
	</appSettings>
</configuration>

[arun1985]

Values stored in web.config are generally accessed like this:

Code:

private static AppSettingsReader ap = new AppSettingsReader();
public static int SitesPerGrouping
    {
        get
        {
            return (int)ap.GetValue("SitesPerGrouping", typeof(int));
        }
    }

web.config

<configuration>
	<appSettings>
		<add key="SitesPerGrouping" value="500"/>
	</appSettings>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>

<configuratio n>
<configSections >
<section name="log4net" type="System.Co nfiguration.Ign oreSectionHandl er" />
<section name="sharpwebm ail" type="anmar.Sha rpWebMail.Sharp WebMailConfigHa ndler, SharpWebMail" />
</configSections>
<sharpwebmail >
<!--
The <general> section is used to configure global options
default_lang: Default localization language
title: Title displayed in every page.
-->
<general
default_lang="e n"
title = "[general title] configuration setting"
/>
<!--
The <login> section is used to configure login screen options

title: Title displayed in login screen

mode:
1-> Full email required for login
2-> Any username is allowed
3-> Any username is allowed but the append
string is added to supplied username

append: text to append to user supplied username

serverselection :
auto -> The server is selected using the configured regular expressions.
manual -> The server is selected by the user.

enablequerystri nglogin: Login credentials can be given in the querystring of
the login page. The provided credentials must comply with the same
restrictions as when provided manually. The querystring items used are
username and password. Possible values:
true-> enabled
false-> disabled

Note: Be careful when using this option as the passwords will be seen in
clear text easily (for example in the browser history).
Example: http://localhost/login.aspx?user name=anmar@dev. anmar.eu.org&pa ssword=testpass
-->
<login
title="[login title] configuration setting"
mode="1"
append=""
serverselection ="auto"
enablequerystri nglogin="false"
/>

If i have a web.config section like this and i have to read the value of mode in login section then how to read the value?