Lập Trình .NET

        public static string ToBase64(this string src, Encoding encoding)
        {
            byte[] b = encoding.GetBytes(src);
            return Convert.ToBase64String(b);
        }

        public static string Base64ToString(this string src, Encoding encoding)
        {
            byte[] b = Convert.FromBase64String(src);
            return encoding.GetString(b);
        }

        public static string RemoveHtml(this string text)
        {
            return Regex.Replace(text, "<[^>]*>", string.Empty);
        }

        public static string HtmlEncode(this string src)
        {
            return System.Net.WebUtility.HtmlEncode(src);
        }

        public static string HtmlDecode(this string src)
        {
            return System.Net.WebUtility.HtmlDecode(src);
        }

        public static string UrlEncode(this string src)
        {
            return System.Web.HttpUtility.UrlEncode(src);
        }

        public static string UrlDecode(this string src)
        {
            return System.Web.HttpUtility.UrlDecode(src);
        }

Using SQL Server Management Studio

Using Transact-SQL

USE master;
GO
ALTER DATABASE AdventureWorks2012
SET SINGLE_USER
WITH ROLLBACK IMMEDIATE;
GO
ALTER DATABASE AdventureWorks2012
SET READ_ONLY;
GO
ALTER DATABASE AdventureWorks2012
SET MULTI_USER;
GO