Forcefully delete Database if database is already in use.

ForceDeleteInitializer.cs

 /// <summary>
    /// Database Initializer that will Drop/Create databases that are currently in use
    /// </summary>
    /// <typeparam name="TContext">Data Context</typeparam>
    public class ForceDeleteInitializer<TContext> : IDatabaseInitializer<TContext> where TContext : DbContext
    {
        private readonly IDatabaseInitializer<TContext> _initializer;

        public ForceDeleteInitializer()
        {
            _initializer = new DropCreateDatabaseAlways<TContext>();
        }

        public ForceDeleteInitializer(IDatabaseInitializer<TContext> innerInitializer)
        {
            _initializer = innerInitializer;
        }

       
        public void InitializeDatabase(TContext context)
        {
            if (context.Database.Exists())
            {
                context.Database.ExecuteSqlCommand(TransactionalBehavior.DoNotEnsureTransaction, string.Format("ALTER DATABASE {0} SET SINGLE_USER WITH ROLLBACK IMMEDIATE", context.Database.Connection.Database));
            }
            _initializer.InitializeDatabase(context);

            if (context is IDbContextSeeder)
            {
                (context as IDbContextSeeder).Seed();
            }
            if (context.Database.Exists())
            {
                context.Database.ExecuteSqlCommand(TransactionalBehavior.DoNotEnsureTransaction, string.Format("ALTER DATABASE {0} SET MULTI_USER", context.Database.Connection.Database));
            }
        }
    }

Reference link :-
http://fusioncomputing.com/blog/post/ef6-and-execute-sql-command