Database Connection Error

See more:

C#

SQL

LINQ

Hello friends,
I created a Service based MDF file in Visual studio, and connect it to a Linq dbml file. but i get this error, before i didn't see this.

the error is in here:

public LINQDataContext() :
                base(global::Language_Learning_Application.Properties.Settings.Default.Database1ConnectionString, mappingSource)
        {
            OnCreated();
        }

The error:

System.ArgumentException was unhandled
  Message=Invalid value for key 'attachdbfilename'.
  Source=System.Data
  StackTrace:
       at System.Data.SqlClient.SqlConnectionString.VerifyLocalHostAndFixup(String& host, Boolean enforceLocalHost, Boolean fixup)
       at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
       at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
       at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
       at System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value)
       at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Initialize(IDataServices dataServices, Object connection)
       at System.Data.Linq.DataContext.Init(Object connection, MappingSource mapping)
       at Language_Learning_Application.LINQDataContext..ctor() in e:\Germany\Learning Language without dx-Ger -B-1-10-2013\Language Learning Application\Language Learning Application\LINQ.designer.cs:line 50
       at Language_Learning_Application.AddWords.AddWords_Load(Object sender, EventArgs e) in e:\Germany\Learning Language without dx-Ger -B-1-10-2013\Language Learning Application\Language Learning Application\AddWords.cs:line 147
       at System.Windows.Forms.Form.OnLoad(EventArgs e)
       at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
       at Language_Learning_Application.Form1.button1_Click(Object sender, EventArgs e) in e:\Germany\Learning Language without dx-Ger -B-1-10-2013\Language Learning Application\Language Learning Application\Form1.cs:line 23
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at Language_Learning_Application.Program.Main() in e:\Germany\Learning Language without dx-Ger -B-1-10-2013\Language Learning Application\Language Learning Application\Program.cs:line 21
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

My connection at Properties is :
Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True

And my database is in my debug folder and it is created by sql server 2012.