Exception occurred while initializing the database. Login failed for user on re-creation after deletion - entity-framework-6

Question

On the first run my program creates the database and log file correctly in the user's folder.
If I then delete the database and log file and run the program again I get an error.
using System;
using blocks6.Module.BusinessObjects;
namespace BlocksConsole
{
class Program
{
static void Main(string[] args)
{
try
{
AddToTable();
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
}
private static void AddToTable()
{
using (var db = new blocks6DbContext())
{
var inf = new ModuleInfo();
db.ModulesInfo.Add(inf);
db.SaveChanges();
}
Console.WriteLine("Fin");
}
}
}
and
using System.Data.Entity;
namespace blocks6.Module.BusinessObjects
{
public class blocks6DbContext : DbContext
{
public blocks6DbContext()
: base("name=ConnectionString")
{
// Database.SetInitializer(new DbInitializer()); uncommenting makes no difference
}
public DbSet<ModuleInfo> ModulesInfo { get; set; }
}
public class DbInitializer : CreateDatabaseIfNotExists<blocks6DbContext>
{
}
public class ModuleInfo
{
public int Id { get; set; }
}
}
app.config is
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<connectionStrings>
<add name="ConnectionString" connectionString="Integrated Security=SSPI;MultipleActiveResultSets=True;Data Source=(localdb)\mssqllocaldb;Initial Catalog=blocksConsole" providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
The project file is
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{477EDA75-B7F0-4D45-866F-0AB92CE38783}</ProjectGuid>
<OutputType>Exe</OutputType>
<RootNamespace>BlocksConsole</RootNamespace>
<AssemblyName>BlocksConsole</AssemblyName>
<TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
<Deterministic>true</Deterministic>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="BlocksDbContext.cs" />
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="EntityFramework">
<Version>6.2.0</Version>
</PackageReference>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>
My Win10 OS is Version 1809 Build 17763.194
Rebooting does not help.
[Update]
I created a new console program on a different computer running VS 15.8.1
The program locks up on the line
db.ModulesInfo.Add(inf);
When I upgraded to 15.9.4 the lock up ceased. However the error re-creating the database repeats on this computer too.
Winver on the second computer shows 1803 17134.471
Emptying the recycle bin does not help.

Answer 1

It turns out that the deleted database still shows as a node in SQL Server Object Explorer ( inside Visual Studio)
If I delete it
then the program runs successfully to re-create the database.