IDENTITY_INSERT is set to OFF

Error:
Cannot insert explicit value for identity column in table 'XYZ' when IDENTITY_INSERT is set to OFF.

Solution:
If you work on ASP .Net vNext with MVC 6.0 and EF 7.0 beta, welcome to hell :-))
It's was kidding.

Solution 1 is add [DatabaseGenerated(DatabaseGeneratedOption.None)] annotation to your ID of your Table (class model)

Solution 2 is add below line to OnModelCreating override method of your DbContext
builder.Entity<XYZ>().Property(i => i.Id).GenerateValuesOnAdd(generateValues: false);

No service for type

Error:
An unhandled exception occurred while processing the request.
Exception: TODO: No service for type 'ABC.Services.XYZService' has been registered.
Microsoft.Framework.DependencyInjection.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)

Solution:
If you have a new Service in your ASP .Net vNext, you need to add below line in ConfigureServices(IServiceCollection services) function in Startup.cs for register it ;-)

services.AddTransient<XYZService>();

PS: At this time ASP .Net vNext, Visual Studio 2015 and MVC 6.0 are beta version.

Update 1: it could be solved with this services.AddScoped<XYZService>();

Problem with webopt for Scripts

Quistions: 
- BundleReference for ASP .Net Forms
- System.Web.Optimization.Scripts.Render for ASP .Net Forms
- Render script without bundlereference
- Microsoft.AspNet.Web.Optimization.WebForms for Render Scripts
- @Scripts.Render for Web Forms
- Render ScriptBundle for Web Forms

Solution:
<%: System.Web.Optimization.Styles.Render("~/bundles/css") %>
<%: System.Web.Optimization.Scripts.Render("~/bundles/js") %>

Microsoft.Jet.OLEDB.4.0 provider is not registered

Error:
The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine.

Resolution:
There is no chance to use of Microsoft.Jet.OLEDB.4.0 and Microsoft Access Files like mdb file on 64bit Windows

Solution 1:
Right Click on Project > Properties > Build > Change Platform Target to x86 and recompile it again

Solution 2:
Go to App.config and change ConnectionString from Provider=Microsoft.Jet.OLEDB.4.0 to Provider=Microsoft.ACE.OLEDB.12.0