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Replace Properties.Settings DB connection with connectionStrings name

I'm working on a project that takes the connection to the database via the `Properties.Settings.Default;
so I have to set the connection string there, but it gets annoying because I already have a connection string set in the We.config file.
How to I set the Properties.Settings to use DefaultConnection connection string in the database?
var request = HttpContext.Current.Request;
var settings = Properties.Settings.Default; <--- use 'DefaultConnection' connectionString
using (var db = new Database(settings.DbType, settings.DbConnection))
{...}
my connection string
<connectionStrings>
<add name="DefaultConnection" connectionString="server=localhost;Database=DB;Integrated Security=SSPI" providerName="System.Data.SqlClient" />
</connectionStrings>
THANK YOU!

Call connection string into another connection string in web.config

I have two connections in the web.config basically they are calling the same database. I want to manage this in a better manner because change in one config also needs to change the second connection string as well.
<add name="DefaultConnection" connectionString="Data Source=.\SQLEXPRESS;persist security info=True;user id=test;password=test123;database=db-AUTH" providerName="System.Data.SqlClient" />
<add name="dbEntities" connectionString="metadata=res://*/InsuranceFinderModel.csdl|res://*/InsuranceFinderModel.ssdl|res://*/InsuranceFinderModel.msl;provider=System.Data.SqlClient;provider connection string="data source=.\SQLEXPRESS;initial catalog=db-AUTH;persist security info=True;user id=test;password=test123;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
My question is, is there any way i can call the connection string into the other connection string.
For example. default connection connection string into db entities something like
<add name="dbEntities" connectionString="metadata=res://*/InsuranceFinderModel.csdl|res://*/InsuranceFinderModel.ssdl|res://*/InsuranceFinderModel.msl;provider=System.Data.SqlClient;provider connection string= DefaultConnection" providerName="System.Data.EntityClient" />
Any suggestions would be appreciated thanks.

You are not obliged to use connection string defined inside app.config(web.config) file for entity connection. You can change entity connection string at runtime. Read this article for that: http://www.c-sharpcorner.com/UploadFile/dacca2/pass-connection-string-in-run-time-to-entity-framework/ .
Also you can get another connnection string and separete every part of connection string( DataBase,DataSource and etc.) using StringConnectionBuilder class https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnectionstringbuilder.initialcatalog.aspx.
The solution is: Get DefaultConnection string and change entity connection at runtime.

Not able to read connection string from app config

This is my connection string in App.config
<connectionStrings>
<add name="CostAllocationEntities2" connectionString="Data Source=PC210090\SQLEXPRESS; Initial Catalog=master;Persist Security Info=True;
User ID=sa;password=password-1;multipleactiveresultsets=True; " providerName="System.Data.SqlClient"/>
</connectionStrings>
ServerConnection connection = new ServerConnection(ConfigurationManager.ConnectionStrings["CostAllocationEntities2"].ConnectionString);
Server sqlServer = new Server(connection);
Database db = sqlServer.Databases[strDBName];
Exception : Failed to connect to server Data Source=PC210090\SQLEXPRESS; Initial Catalog=master;Persist Security Info=True;
User ID=sa;password=password-1;multipleactiveresultsets=True; .

What are you trying to do, not sure but change your connection string
connectionString="Data Source=PC210090\\SQLEXPRESS;
Initial Catalog=master;; don't connect to master DB rather provide a user DB name like Sample.
<connectionStrings>
<add name="CostAllocationEntities2" connectionString="Data Source=PC210090\\SQLEXPRESS; Initial Catalog=Sample;Persist Security Info=True; User ID=test;password=test;multipleactiveresultsets=True; " providerName="System.Data.SqlClient"/>
</connectionStrings>
In your code behind
Once you have the connection string create a instance of SqlConnection like
SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["CostAllocationEntities2"].ConnectionString);
Open the connection
connection.Open();

Connection string has quotation mark, how to pass it to SqlConnection

I have created a LocalDB database in my project and its connection string is :
Data Source=(LocalDB)\v11.0;AttachDbFilename="E:\Projects\visual studio 2013\Projects\sqlce\mydb.mdf";Integrated Security=True;Connect Timeout=30
How should I pass it to SqlConnection()?
Note that it has an address within quotation marks. Have I done anything wrong?
I guess even if I program it correctly it won't work in another computer which doesn't have that .mdf file in that exact place. Isn't it so?
How can I have a program with a portable database so I can easily publish my pp?

Add the mdf file to your solution and and change the property "Copy to Output Directory" to Copy Always. Don't hardcode the mdf file path in connection string. Add the connection string in app.config or web.config file like below:
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\myDB.mdf;Initial Catalog=MyDatabaseName;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
Then you can access the connection string in your C# code as below:
string conStr = System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString()
If you face any error regarding accessing the mdf file, the you can set the DataDirectory in your C# code using AppDomain.CurrentDomain.SetData() method.

<connectionStrings>
<add
name="NorthwindConnectionString"
connectionString="Data Source=serverName;Initial
Catalog=Northwind;Persist Security Info=True;User
ID=userName;Password=password"
providerName="System.Data.SqlClient"
/>
</connectionStrings>
you can access by
connString =rootWebConfig.ConnectionStrings.ConnectionStrings["NorthwindConnectionString"];
More about connection string
SqlConnection con = new SqlConnection(connstring);
or you can go in this way like
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);

Dynamics Connection SQL Server C#

I would like some explanations on how to create and set up a dynamic connection to SQL Server DB engine in a C # project

if you want connection string in config and read it than you need to do like this , put possible connectionstring in config
<connectionStrings>
<add name="CharityManagement"
connectionString="Data Source=.;Initial Catalog=CharityManagement;Integrated Security=True"/>
<add name="CharityManagement_two"
connectionString="Data Source=.;Initial Catalog=CharityManagement_two;Integrated Security=True"/>
</connectionStrings>
and than read it base on condition using configurationmanager class
//to read first connection string
var connectionString=ConfigurationManager.ConnectionStrings["CharityManagement"].ConnectionString;
//to read second connection string
var connectionString=ConfigurationManager.ConnectionStrings["CharityManagement_two"].ConnectionString;

This is what you're after
In the config file
<connectionStrings>
<add name="myConnectionString" connectionString="server=localhost;database=myDb;uid=myUser;password=myPass;" />
</connectionStrings>
Then to read the connection string in your code you will do
string connStr = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;
Don't forget to use using System.Configuration;
Further reading here