创建sqlce 数据库

            string dbPathName = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase)+@"\databasename.sdf";

            if (File.Exists(dbPathName))
            {
                File.Delete(dbPathName);
            }

            string strCon = "Data Source =" + dbPathName + ";";

            SqlCeEngine engine = new SqlCeEngine(strCon);

            engine.CreateDatabase();

            engine.Dispose();