Не получается подключиться к серверу

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Linq;
using System.Data.Linq.Mapping;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace z1
{
    public partial class Form1 : Form
    {
        static string connectionString = @"Data Source=.;Initial Catalog=usersdb;Integrated Security=True";
        string info = "";
 
        public DataContext db = new DataContext(connectionString);
 
        [Table(Name = "Users")]
        public class User
        {
            [Column(IsPrimaryKey = true, IsDbGenerated = true)]
            public int Id { get; set; }
            [Column(Name = "Name")]
            public string FirstName { get; set; }
            [Column]
            public int Age { get; set; }
        }
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
 
            Table<User> users = db.GetTable<User>();
            foreach (var user in users)
            {
                info = "";
                info += user.Id + " " + user.FirstName + " " + user.Age;
                MessageBox.Show(info);
            }
        }
    }
}

System.Data.SqlClient.SqlException
  HResult=0x80131904
  Сообщение = Cannot open database "usersdb" requested by the login. The login failed.
Login failed for user 'DESKTOP-J4JFB5D\Dimaq'.
  Источник = .Net SqlClient Data Provider
  Трассировка стека:
   в System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling, SqlAuthenticationProviderManager sqlAuthProviderManager)
   в System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   в System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
   в System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   в System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   в System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   в System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   в System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   в System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   в System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   в System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   в System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   в System.Data.SqlClient.SqlConnection.Open()
   в System.Data.Linq.SqlClient.SqlConnectionManager.UseConnection(IConnectionUser user)
   в System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe()
   в System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode()
   в System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   в System.Data.Linq.Table`1.GetEnumerator()
   в System.Windows.Forms.Control.OnClick(EventArgs e)
   в System.Windows.Forms.Button.OnClick(EventArgs e)
   в System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   в System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   в System.Windows.Forms.Control.WndProc(Message& m)
   в System.Windows.Forms.ButtonBase.WndProc(Message& m)
   в System.Windows.Forms.Button.WndProc(Message& m)
   в System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   в System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   в System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   в System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   в System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   в System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   в System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   в System.Windows.Forms.Application.Run(Form mainForm)