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How to move connectionString from App.config to code in C#?

I want to remove connectionString from App.config and add it to code. I'm using WinForms(C#) and .Net Framework 4.8. I have textBoxes and a datagridview on my form. I'm using Microsoft Access Database (.mdb). I want to do this because database's password is visible in App.config. Is there any way to do that
Here is my app.config XML code :
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
</configSections>
<connectionStrings>
<add name="Locker.Properties.Settings.pw_dbConnectionString"
connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\files\pw_db.mdb;Persist Security Info=True;Jet OLEDB:Database Password=XYZ"
providerName="System.Data.OleDb" />
</connectionStrings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
</startup>
</configuration>

I would suggest you not to define the connection string in code, better you can encrypt it in the app.config file.
Please follow the following steps:
Rename app.config to web.config
Open command prompt and type:
%windir%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis -pef
"connectionStrings" path of the web.config>
Rename web.config back to app.config
If you open the file in notepad, you will see the encrypted value and you can continue using it as you were using before.

configuration system failed to initialize in visual studio 2010 windows form

I'm currently facing this error while running my c# program:
configuration system failed to initialize
here is my app.config file:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<add name="FastConnection"
connectionString="DataSource=.\SQLEXPRESS;AttachDbFilename=C:\Users\mustiondb.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True" />
</configSections>
</configuration>
I believe there is probably information lacking in this app.config file. However, I'm not sure what information. When I created an app config file from my windows form (visual studio 2010), the only information in the app config file was this:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
</configuration>
I tried searching for information to add in, but i'm not sure what and where to find these information.

If you want to use connection string use <connectionStrings> not <Configurations>
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="FastConnection" connectionString="DataSource=.\SQLEXPRESS;AttachDbFilename=C:\Users\mustiondb.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True" />
</connectionStrings>
</configuration>
If you need to add custom application settings
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="Key0" value="0" />
<add key="Key1" value="1" />
<add key="Key2" value="2" />
</appSettings>
</configuration>

I faced the same issue. I had an & in one of the strings of app.Config and somehow Visual Studio didn't show the error while building. After replacing & with & it worked fine.

ConfigurationManager.AppSettings[key] not accessible within class library

I am unable to access CloudfigurationManager from within an method. The code was originally a klass library and I added a configuration file (App.config) where I am simply adding the values for a hard coded test for Azure SDK.
OpenSessionWithAzure()
private void OpenSessionWithAzure()
{
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConfigurationManager.AppSetting["APP_SETTINGS"])// Visual Studio is unable to identify ConfigurationManager
}
App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="StorageConnectionString" connectionString="DefaultEndpointsProtocol=https;AccountName=userName;AccountKey=Key"/>
<add name="SasPolicyName" connectionString="myPolicy"/>
</connectionStrings>
</configuration>
Is there a reason why I am unable to access the ConfigurationManager within my application or a known workaround?

The reason for this error was due to the fact that I did not:
Have a reference to System.Configuration.dll in my class library.
Did not have the using System.Configuration
After adding performing the steps above I am not able to access ConfigurationManager.AppSettings["APP_SETTINGS"]

You need to add reference to System.Configuration and then add key-value pair in appSettings section
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="SasPolicyName" value="myPolicy" />
<add key="APP_SETTINGS" value="MySetting" />
</appSettings>
<connectionStrings>
<add name="StorageConnectionString" connectionString="DefaultEndpointsProtocol=https;AccountName=userName;AccountKey=Key"/>
</connectionStrings>
</configuration>
Then use like below,
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConfigurationManager.AppSetting["APP_SETTINGS"])

The method signature you use must be consistent with the setting in your App.config.
With the setting below,
<configuration>
<appSettings>
<add key="StorageConnectionString" value="XXXXXXXXX"/>
</appSettings>
</configuration>
use System.Configuration.ConfigurationManager.AppSettings["StorageConnectionString"].
And System.Configuration.ConfigurationManager.ConnectionStrings["StorageConnectionString"] for
<configuration>
<connectionStrings>
<add name ="StorageConnectionString" connectionString="XXXXXXXXXX"/>
</connectionStrings>
</configuration>

When you attempt to read from appSettings, it reads from the .config file of the executing application. So in the simplest implementation you'd just need to add those configuration settings to that application's .config file (app.config or web.config.) There are other ways to approach it if you absolutely need the library to have its own .config file, but adding it to the executing application's .config is what's done most commonly.

'Dynamic' connection string for ms-access C#

I have an access database connected to my code via a connection string as shown:
connection = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Me\Documents\Visual Studio 2013\Projects\Computing Project\Database.accdb;
Persist Security Info=False;");
However I would like this app to be able to be installed on other devices, so I'm guessing the connection string has to be dynamic and change on each system. How would I use this in my code?

Add an App.config to the solution with following content
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
</startup>
<connectionStrings>
<add name="MyCon" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Me\Documents\Visual Studio 2013\Projects\Computing Project\Database.accdb; Persist Security Info=False;"/ >
</connectionStrings>
</configuration>
Then in code,
connection = new OleDbConnection(ConfigurationManager.ConnectionStrings["MyCon"].ToString());
PS: ConfigurationManager class is in assembly System.Configuration.
So please add a reference of this assembly before using it.

Setup of the project was unable to open database on another machine. my project is in c# windows application with sqlite database connection

I have inserted app.config file in my project.
Please help me out to overcome from this problem.
<?xml version="1.0"?>
<configuration>
<configSections>
</configSections>
<connectionStrings>
<add name="RConnString" connectionString="Data Source=C:\Users\user\Documents\Visual Studio 2010\Projects\Pathology lab\Pathology lab\bin\Debug\Pathology.sqlite"
providerName="System.Data.Sqlite" />
<add name="Pathology_lab.Properties.Settings.PathologyConnectionString"
connectionString="data source="C:\Users\user\Documents\Visual Studio 2010\Projects\Pathology lab\Pathology lab\bin\Debug\Pathology.sqlite;"
providerName="System.Data.SQLite" />
<add name="screen_shot.Properties.Settings.PathorecordConnectionString"
connectionString="data source="C:\Users\user\Desktop\screen shot\screen shot\bin\Debug\Pathorecord.db""
providerName="System.Data.SQLite" />
</connectionStrings>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>

try to use this connection string

try to write connection string in |DataDirectory|/Databasename.db
And call App.domain () method