LocalDBHelper.cs

namespace LocalDBSample
{
    using System;
    using System.Data.SqlClient;
    using System.IO;
    using System.Reflection;

    public class LocalDBHelper
    {
        public static string DataDirectory 
        {
            get
            {
                return (string)AppDomain.CurrentDomain.GetData("DataDirectory") ??
                    (DataDirectory = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "App_Data"));
            }

            set
            {
                AppDomain.CurrentDomain.SetData("DataDirectory", value);

                if (!Directory.Exists(value))
                {
                    Directory.CreateDirectory(value);
                }
            }
        }

        public LocalDBHelper(string databaseName) : this(11, databaseName)
        {
        }

        public LocalDBHelper(int version, string databaseName)
        {
            if (version != 11 && version != 12)
            {
                version = 11;
            }

            this.Version = version;
            this.DatabaseName = databaseName;

            if (DataDirectory == null)
            {
                
            }
        }
                
        public int Version
        {
            get;
            protected set;
        }

        public string DatabaseName
        {
            get;
            protected set;
        }

        public string DatabaseConnectionString 
        {
            get
            {
                return string.Format(@"Server=(localdb)\v{0}.0; AttachDbFilename=|DataDirectory|\{1}.mdf; Database={1}; Integrated Security=True", this.Version, this.DatabaseName);
            }
        }

        public string MasterConnectionString
        {
            get
            {
                return string.Format(@"Server=(localdb)\v{0}.0; Database=master; Integrated Security=True", this.Version);
            }
        }

        public void CreateDatabase()
        {
            using (var connection = new SqlConnection(this.MasterConnectionString))
            {
                connection.Open();

                using (SqlCommand cmd = connection.CreateCommand())
                {
                    cmd.CommandText = String.Format(@"CREATE DATABASE {0} ON (NAME = N'{0}', FILENAME = '{1}\{0}.mdf')", this.DatabaseName, DataDirectory);
                    cmd.ExecuteNonQuery();
                }
            }
        }

        public void DropDatabase()
        {
            using (var connection = new SqlConnection(this.MasterConnectionString))
            {
                connection.Open();

                using (SqlCommand cmd = connection.CreateCommand())
                {
                    cmd.CommandText = String.Format(@"ALTER DATABASE {0} SET SINGLE_USER WITH ROLLBACK IMMEDIATE", this.DatabaseName);
                    cmd.ExecuteNonQuery();

                    cmd.CommandText = String.Format(@"DROP DATABASE {0}", this.DatabaseName);
                    cmd.ExecuteNonQuery();
                }
            }
        }

        public bool CheckDatabase()
        {
            try
            {
                using (var connection = new SqlConnection(this.DatabaseConnectionString))
                {
                    connection.Open();

                    return true;
                }
            }
            catch (Exception)
            {
                return false;
            }
        }
    }
}