In Appconfig file how to write the code

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i design application using c sharp.
in that i have threecolumn as follows.
Rental cost ,Diesel service, Service Tax.

Rental Cost 231270
Diesel ser 19767
Ser Tax 30124(231270 + 19767 * 12/100).
Code as follows;

double o = Convert.ToDouble(txt_rentalcost.Text);
double p = Convert.ToDouble(txt_dieselservice.Text);
txt_servicetax.Text = Math.Round((o + p) * 0.12).ToString();

i am doing service tax calculation at that time service tax is 12 percentage.suppose in next year service tax percentage is 12.36.

i post the above question you said that we can write the code in App.config.

In App.config how to write the code.please help me.first time i am using App.config help me.

?xml version="1.0" encoding="utf-8"?>
<configuration>

Posted 19-Nov-12 20:45pm

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__TR__ · Answer 1 · 2012-11-19T21:01:00

Adding Keys in app.config file

XML

<appSettings>
    <add key="author" value="Palanisamy Veerasingam"/>
    <add key="article" value="Configuration Sections"/>
</appSettings>

Retreiving the Key value in your application

C#

return (ConfigurationSettings.AppSettings["author"]);

Check this article for more information
Understanding Section Handlers - App.config File[^]

earloc · Answer 2 · 2012-11-20T01:25:00

Use a settings file:

In Visual Studio, go to "project properties" -> "Settings"

In the shown datagrid add a row with "Name"->TaxPercentage, Type=double, Scope=Application, Value=12
this will result in a new section in your app.config:

XML

<configSections>
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
        <section name="WindowsFormsApplication1.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
</configSections>

and the stored setting:

XML

<applicationSettings>
        <WindowsFormsApplication1.Properties.Settings>
            <setting name="Setting" serializeAs="String">
                <value>0</value>
            </setting>
        </WindowsFormsApplication1.Properties.Settings>
    </applicationSettings>

to access your settings in Code just add a using directive like:

C#

using WindowsFormsApplication1.Properties;

and access your configurable value with:

C#

double value = Settings.Default.TaxPercentage;

this will give you a leightweight but typesafe configurable value in your application
- leightweight, cause you don´t have to write custom config sections, what i prefer if i have to manage many configurable parameters of my application/service/etc.
- typesafe, cause the configuration-system will make sure that the your setting will always be of the expected type

refer this link [^]for detailed information

In Appconfig file how to write the code

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