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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.

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.

Error: Configuration system failed to initialize

Used console application and I have a problem on the app.config file. By right, the code should be correct according to the various sources found in the Internet but my coding is not working for no reason. Anyone can advise me on this?
And the <configuration> appears to be underlined with wriggly blue line, is it a warning or something? I dont know why it appears like this.
[EDITED]
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSetting></configSetting>
<connectionStrings>
<add name="Production"
providerName="System.Data.SqlClient"
connectionString="Data Source=EBSDLAB1SERVER2;Initial Catalog=Production;Integrated Security=True"/>
</connectionStrings>
</configuration>
The error shows, Unhandled Exception: System.Configuration.ConfigurationErrorException:Configuration system fail to initialize ---
System.Configuration.ConfigurationErrorException: Unrecognized configuration section connectionstring
Configuration system failed to initialize

In your App.Config file you need a section for connection strings, it should look like:
<connectionStrings>
<clear />
<add name="Production"
providerName="System.Data.ProviderName"
connectionString="ConnectionStringGoesHere" />
</connectionStrings>
There's more information regarding this here.

I managed to solve this problem which is to copy the app.config file to the same folder as the console application.exe and rename the app.config file according to the console application.exe!
Thank you all for the help!

Dynamic sql connection string

I am using my SQL connection in my mvc4 application as follows:
public static string ConnectionString=#"Data Source=LocalDB)\v11.0;AttachDbFilename=C:\Users\..\Documents\Visual Studio 2012\Projects\..\..\App_Data\RoDB.mdf;Integrated Security=True";
I want to rewrite it as dynamically.
When I change the system, I don't want to change the connection string.

If you use ".\SQLExpress" as server name it will connect to the local instance. In that case you don't need to change your connection string on different machines.

You can put connection strings in your web.config file, this means it is out of application code and doesn't require a re-build to change.
<configuration>
<!-- Other config settings -->
<connectionStrings>
<add name="localDBConnection" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\..\Documents\Visual Studio 2012\Projects\..\..\App_Data\RoDB.mdf;Integrated Security=True" />
</connectionStrings>
</configuration>
Then to use this in your application you can put the following in compiled code:
string myConnectionString = ConfigurationManager.ConnectionStrings["localDBConnection"].ConnectionString;

Whats wrong with using a web config? its pretty much standard practice I'd assume?
Also read up on using the relative path. EG. Relative to application location

add a app configuration file in you application and add setting inside it
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="ConnectionString" value="Data Source=LocalDB)\v11.0;AttachDbFilename=C:\Users\..\Documents\Visual Studio 2012\Projects\..\..\App_Data\RoDB.mdf;Integrated Security=True"/>
</appSettings>
</configuration>
in your code you can write
string ConnectionString= System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].ToString();

How do I use Web.Config transform on my connection strings?

In my current project, I have some connection strings that are valid for local development machines:
<configuration>
<connectionStrings>
<add name="ApplicationServices"
connectionString="Data Source=localhost;Initial Catalog=MyDB;Integrated Security=SSPI"
</connectionStrings>
....
</configuration>
How would I use the Web.Config transforms to convert from this expression to one valid for our production server? The production server one would look something like:
<configuration>
<connectionStrings>
<add name="ApplicationServices"
connectionString="Data Source=IPAddress,Port;Initial Catalog=SomeOtherDB;User ID=TopSecretUsername;Password=SecurePassword"
</connectionStrings>
....
</configuration>
The syntax isn't obvious to me, and I'm completely failing at grokking the page on it.

This works for me but I too have found it to be a bit flakey at times.
You will need to create another file called Web.Config.Release and fill it with the following:
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<connectionStrings>
<add name="local" connectionString="Data Source=IPAddress,Port;Initial Catalog=SomeOtherDB;User ID=TopSecretUsername;Password=SecurePassword"
xdt:Transform="SetAttributes" xdt:Locator="Match(name)"/>
</connectionStrings>
<system.web>
<compilation xdt:Transform="RemoveAttributes(debug)" />
</system.web>
<appSettings>
<add key="default_db_connection" value="local" xdt:Transform="SetAttributes" xdt:Locator="Match(key)" />
</appSettings>
</configuration>

You shouldn't need to create a new file, it should be in the Solution Explorer, expand Web.config, and open Web.Release.config.
Scott Allan has a good video on it here (under Configuration and Deployment > Config Transformations).