The context cannot be used while the model is being created

Question

In my application I receive the following error:

The context cannot be used while the model is being created.

I\'m not sure what

Answer 1

1 - Ensure that the Connection String has a backslash instead of a forward slash:

connectionString="Data Source=.\SQLEXPRESS ....

2 - Add MultipleActiveResultSets=true to the connection string.

3 - What was causing it for me was that I had multiple constructors to my DbContext class:

using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Data.Entity.ModelConfiguration.Conventions;

namespace MyProject
{
    public partial class Model1 : DbContext
    {
        // I had to comment out this one ...
        //public Model1()
        //    : base("name=Model1")
        //{
        //}

        public Model1(bool enableLazyLoading = true)
            : base("name=Model1")
        {
            //Database.SetInitializer(new CreateDatabaseIfNotExists());            
            //this.Configuration.LazyLoadingEnabled = false;

            Database.SetInitializer(null);
            this.Configuration.ProxyCreationEnabled = false;

            ((IObjectContextAdapter)this).ObjectContext.ContextOptions.LazyLoadingEnabled = enableLazyLoading;          
            ((IObjectContextAdapter)this).ObjectContext.ContextOptions.ProxyCreationEnabled = enableLazyLoading;
        }

        public virtual DbSet Products { get; set; }
        // ...
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // ...
        }
    }
}

Once I commented out the original Model1 constructor it solved it.

I left 2 versions of the Lazy Loading/Database.SetInitializer to show there are 2 ways to do it - either enabled or disabled.

• If you use the first 2 lines to NOT use it, don't use the next 4 and remove bool enableLazyLoading = true.
• If you DO use the 4 lines like shown, ensure you keep those 2 lines commented out and keep the bool enableLazyLoading = true.