Develop Reference

How to put string as connection string to app.config?

I want to put my connection string on a USB dongle lock and make my app to read connection string from the lock.
But I don't know how to pass the string to ado.net and the connection string placed on app.config.(I'm using ado.net)The following code is my connection string tag:
<connectionStrings><add name="Db_ReceptionEntities1" connectionString="metadata=res://*/Model.DBReception.csdl|res://*/Model.DBReception.ssdl|res://*/Model.DBReception.msl;provider=System.Data.SqlClient;provider connection string="data source=.;initial catalog=Db_Reception;user id=sa;password=******;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" /></connectionStrings>

How to put string as connection string to app.config?
You do not need to read from the dongle and put it into app.config. You can just read from the dongle and give the connection string to your context.
Your connection string looks like an EF database first connection string. The DbContext class has a constructor which accepts a connection string name or a full connection string. You can use that and pass the connection string to it.
Create your context like this:
public class StackContext : DbContext
{
public StackContext(string connection) : base(connection)
{
}
}
Then read the connection string from the dongle and pass it to your context like this:
// read from dongle
var connectionString = ...;
var ctx = new StackContext(connectionString);

this helped:
public Db_ReceptionEntities1(string x)
: base("name=Db_ReceptionEntities1")
{
Database.Connection.ConnectionString = x;
}

Usage of DbContext(string nameOrConnectionString)

I want to make DB connection using constructor
DbContext(string nameOrConnectionString)
but i dont want to do it using application config file. like this
line in config file
<add name="DBEntities" connectionString="metadata=res://*/DB.csdl|
res://*/DB.ssdl|res://*/DB.msl;provider=System.Data.SqlClient;
provider connection string="data source=SERVER;
initialcatalog=DB;persist security info=True;
user id=XXX;password=YYY;MultipleActiveResultSets=True;
App=EntityFramework"" providerName="System.Data.EntityClient" />
and line in code
public DBEntities() : base("name=DBEntities"){}
instate i want something like this directly in code
public DBEntities() : base("connectionString=metadata=
res://*/DB.csdl|res://*/DB.ssdl|res://*/DB.msl;
provider=System.Data.SqlClient;provider connection string="
data source=SERVER;initial catalog=DB;
persist security info=True;
userid=XXX;password=YYY;MultipleActiveResultSets=True;
App=EntityFramework""){}
if I try so, I have the 'System.ArgumentException': Keyword not supported: 'connectionstring'.
It is possible? How to do what i want?

The problem seems to be twofold:
You have included the attribute name connectionString in the connection string
The " needs to be replaced with '
The correct code should then become:
public DBEntities()
: base("metadata=res://*/DB.csdl|res://*/DB.ssdl|res://*/DB.msl;provider=System.Data.Sq‌​‌​lClient;provider connection string='data source=SERVER;initial catalog=DB;persist security info=True;userid=XXX;password=YYY;MultipleActiveResultSets=True;App=EntityFramew‌​‌​ork'")
{}
You can look here for more details of the elements a connection string consists of, and here for more details on Entity Framework connection string.
Old anwers, for reference:
The problem seems to be that you are including everything the web.config uses to define a connection string. The connection string is itself only what is contained between the quotation marks after the attribute connectionString, in your case data source=SERVER;initial catalog=DB;persist security info=True;userid=XXX;password=YYY;MultipleActiveResultSets=True;App=EntityFramework.
Try this instead:
public DBEntities() : base("data source=SERVER;initial catalog=DB;
persist security info=True;
userid=XXX;password=YYY;MultipleActiveResultSets=True;
App=EntityFramework"){}
Also, you can look here for more details of the elements a connection string consists of.

In your Model.Context.tt, add the following under the constructor;
public <#=code.Escape(container)#>(string connStr)
: base(connStr)
{
<#
if (!loader.IsLazyLoadingEnabled(container))
{
#>
this.Configuration.LazyLoadingEnabled = false;
<#
}
foreach (var entitySet in container.BaseEntitySets.OfType<EntitySet>())
{
// Note: the DbSet members are defined below such that the getter and
// setter always have the same accessibility as the DbSet definition
if (Accessibility.ForReadOnlyProperty(entitySet) != "public")
{
#>
<#=codeStringGenerator.DbSetInitializer(entitySet)#>
<#
}
}
#>
}
After rebuilding, you will now have a second constructor taking a string argument connStr;
public DBEntities() : base("name=DBEntities"){}
public DBEntities(string connStr) : base(connStr){}
You can now create your own connection string in your code and pass it to the constructor. Example;
public string connStr = "your connection string";
using (var db = new DBEntities(connStr))
{
//do things with db
}

The problem is with your connection string passed to constructor.
try this instead :
private const string _connectionString = #"data source=SERVER;initial catalog=DB;persist security info=True;user id=XXX;password=YYY;MultipleActiveResultSets=True";
public DBEntities() : base(_connectionString)
{
}

Setup a valid connection string for SimpleMembership

I am trying to setup a valid connection string for my database so that my WebSecurity.InitializeDatabaseConnection method can point to my database.
Here's my connection string:
<add name="Database_Entities1" connectionString="metadata=res://*/Models.DAL.Entities.MTG_Model.csdl|res://*/Models.DAL.Entities.MTG_Model.ssdl|res://*/Models.DAL.Entities.MTG_Model.msl;provider=System.Data.SqlClient;provider connection string="data source=**.**.***.***;initial catalog=Model_Name;persist security info=True;user id=*****;password=*********;multipleactiveresultsets=True;application name=EntityFramework;Pooling=True;Max Pool Size=1000"" providerName="System.Data.EntityClient" />
The problem here is the provider name which is System.Data.EntityClient. I actually need it to point toward System.Data.SqlClient, but when I try to copy/paste the connection string and replace the System.Data.EntityClient with the other provider name, I get such crash like Keyword not supported: 'metadata'..
So my understanding is that calling my method like this:
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
{
private static SimpleMembershipInitializer _initializer;
private static object _initializerLock = new object();
private static bool _isInitialized;
public override void OnActionExecuting(ActionExecutingContext _filterContext)
{
// Ensure ASP.NET Simple Membership is initialized only once per app start
LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock);
}
private class SimpleMembershipInitializer
{
public SimpleMembershipInitializer()
{
Database.SetInitializer<Database_Entities1>(null);
try
{
using (var context = new Database_Entities1())
{
if (!context.Database.Exists())
{
// Create the SimpleMembership database without Entity Framework migration schema
((IObjectContextAdapter)context).ObjectContext.CreateDatabase();
}
}
WebSecurity.InitializeDatabaseConnection("Database_Entities2", "UserProfile", "UserId", "UserName", true);
}
catch (Exception ex)
{
throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex);
}
}
}
}
Where Database_Entities2 is:
<add name="Database_Entities2" connectionString="metadata=res://*/Models.DAL.Entities.MTG_Model.csdl|res://*/Models.DAL.Entities.MTG_Model.ssdl|res://*/Models.DAL.Entities.MTG_Model.msl;provider=System.Data.SqlClient;provider connection string="data source=**.**.***.***;initial catalog=Model_Name;persist security info=True;user id=*****;password=*********;multipleactiveresultsets=True;application name=EntityFramework;Pooling=True;Max Pool Size=1000"" providerName="System.Data.SqlClient" />
Does not work because an SqlClient connection string does not work that way. Can anyone help me achive what I'm trying to do? Thanks a lot!
EDIT
Two additionnal piece of information: I have this connection string:
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-MyApp-20130829080410;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-MyApp-20130829080410.mdf" providerName="System.Data.SqlClient" />
Which was working; however, as you can see, it does not point toward my database, so if I try to retrieve any users in the table "UserProfile", it is not possible since the table was created in the local database (which I don't know why I have), and not in the main one (Database_Entities1), hence this question.

The SimpleMembershipProvider expects a normal connection string, not an entity framework connection string. You need to define a separate connection string that points to the same database as your entity framework connection string and use that:
<add name="MembershipDB"
connectionString="Data Source=**.**.***.***;Initial Catalog=Model_Name;[...]"
providerName="System.Data.SqlClient" />

If you use Entity Framework the connection string would be created by the IDE. And from your description i guess you created that connection string by your own, not via IDE.
So the IDE would place something like this in your app.config:
<add name="libraryEntities1" connectionString="metadata=res://*/privlibDBmodel.csdl|res://*/privlibDBmodel.ssdl|res://*/privlibDBmodel.msl;provider=System.Data.SqlClient;provider connection string="data source=[yourserver];initial catalog=library;integrated security=True;multipleactiveresultsets=True;application name=EntityFramework"" providerName="System.Data.EntityClient" />
To create the connection in your program you could use this:
libraryEntities1 dbconn = new libraryEnitits1();
Now you could handle the connections via dbcon object.

SQL Server connection string in code vs config file in ASP.NET site

I already have a connection string in my config file
<connectionStrings>
<add
name="ConnectionString"
connectionString="Data Source=*;Initial Catalog=*;User ID=*;Password=*"
providerName=".NET Framework Data Provider for SQL Server" />
Currently I am just adding another connection string in my .cs file:
SqlConnection myConnection =
new SqlConnection("user id=*;password=*;server=localhost;");
I want to use config file string to connect to a database in the .cs file without adding another string. How can I do that?
using (SqlConnection cn =
new SqlConnection(
ConfigurationManager.ConnectionStrings["MyDbConn"].ToString()))
This was the code I found, is there any shorter way?

Using ConnectionStrings property of System.Web.Configuration.WebConfigurationManager to get connection string in config file

Not really, but you could wrap it in its own little helper function:
private static string GetConnectionString(string name)
{
return WebConfigurationManager.ConnectionStrings[name].ConnectionString;
}
using (var cn = new SqlConnection(GetConnectionString("MyDbConn"))) { ... }

Just use System.Configuration.ConfigurationManager.ConnectionStrings to get access to the connection string defined in your config file.
var myconnectionString = System.Configuration.ConfigurationManager
.ConnectionStrings["ConnectionString"].ConnectionString;

You can create a static helper class, named Config or something similar and give it a property ConnectionString, that will return the long "WebConfigurationManager.ConnectionStrings["MyDbConn"].ConnectionString" thing. That is the approach I usually go with in my projects and it's actually very easy to use.
public static class Config
{
public static string ConnectionString
{
get
{
return WebConfigurationManager.ConnectionStrings["MyDbConn"].ConnectionString;
}
}
}
This approach is the most useful when more classes need to acccess the connection string and this way you have a centralized access to it and easy to change solution.

Entity Framework - The underlying provider failed on ConnectionString

While using the Entity Framework I have split it out to it's own project:
RivWorks.Model - Contains Entity Model
RivWorks.Controller - Uses the Entity Model and contains the biz rules
RivWorks.View.Web - The web site
RivWorks.View.Services - WCF project
Everything in the web site is working fine. I am able to call into the Controller and get a valid Model back. When I try the same thing from the Web.Service I am getting this error:
ERROR:
The underlying provider failed on ConnectionString.
STACK TRACE:
at System.Data.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString)
at System.Data.EntityClient.EntityConnection..ctor(String connectionString)
at System.Data.Objects.ObjectContext.CreateEntityConnection(String connectionString)
at System.Data.Objects.ObjectContext..ctor(String connectionString, String defaultContainerName)
at RivWorks.Model.Entities.RivFeedsEntities1..ctor(String connectionString)
at RivWorks.Model.FeedStoreReadOnly..ctor(String connectionString)
at RivWorks.Controller.ProductManager.LookupProduct(String productID, String sku, String urlRef, String env, String logPath)
I am a bit confused as to why and digging through the error logs I finally figured out the connection strings were not being read from the Web Site's config file. So, I added some code to catch that and, for now, hard coded the values in. Like:
public dataObjects.NegotiateSetup LookupProduct(string productID, string sku, string urlRef, string env, string logPath)
{
string feedConnString = "";
string rivConnString = "";
log.InitializeLogFile(logPath);
dataObjects.NegotiateSetup resultSet = new dataObjects.NegotiateSetup();
try { feedConnString = AppSettings.FeedAutosEntities_connString; }
catch { feedConnString = #"metadata=res://*/Entities.FeedEntities.csdl|res://*/Entities.FeedEntities.ssdl|res://*/Entities.FeedEntities.msl;provider=System.Data.SqlClient;provider connection string='Data Source=***.***.***.***;Initial Catalog=******;Persist Security Info=True;User ID=******;Password="******";MultipleActiveResultSets=True'"; }
try { rivConnString = AppSettings.RivWorkEntities_connString; }
catch { rivConnString = #"metadata=res://*/Entities.RivEntities.csdl|res://*/Entities.RivEntities.ssdl|res://*/Entities.RivEntities.msl;provider=System.Data.SqlClient;provider connection string='Data Source=******;Initial Catalog=******_Dev;Persist Security Info=True;User ID=******;Password="******";MultipleActiveResultSets=True'"; }
try
{
using (RivFeedsEntities1 _dbFeed = new FeedStoreReadOnly(feedConnString).ReadOnlyEntities())
{
using (RivEntities _dbRiv = new RivWorksStore(rivConnString).NegotiationEntities())
{
But, alas, it is still giving me the above error! Any ideas why?

I know you've been mucking around with your connection strings to sanitize them but I'm guessing you didn't put the "'s around the password in?
Are they actually required?

Double check your connection string is correct, little typo's can cause this same error.
This is wrong:
<add name="Entities" connectionString="metadata=res://*/OnlineAB.csdl|res://*/OnlineAB.ssdl|res://*/OnlineABSuperAdmin.msl;provider=System.Data.SqlClient;provider connection string="data source.;initial catalog=
This is right:
<add name="Entities" connectionString="metadata=res://*/OnlineAB.csdl|res://*/OnlineAB.ssdl|res://*/OnlineABSuperAdmin.msl;provider=System.Data.SqlClient;provider connection string="data source=.;initial catalog=
See after the DataSource I was missing an equal sign.