mono/mcs/class/referencesource/System.Data/System/Data/SqlClient/SqlCredential.cs

//------------------------------------------------------------------------------
// <copyright file="SqlCredential.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
// <owner current="true" primary="false">[....]</owner>
//------------------------------------------------------------------------------

namespace System.Data.SqlClient
{
    using System;
    using System.Security;
    using System.Data.Common;

    // Represent a pair of user id and password which to be used for SQL Authentication
    // SqlCredential takes password as SecureString which is better way to store security sensitive information
    // This class is immutable
    public sealed class SqlCredential
    {
        string _userId;
        SecureString _password;

        //
        // PUBLIC CONSTRUCTOR
        //

        // SqlCredential
        //  userId: userId
        //  password: password
        //
        public SqlCredential(string userId, SecureString password)
        {
            if (userId == null)
            {
                throw ADP.ArgumentNull("userId");
            }

            if (userId.Length > TdsEnums.MAXLEN_USERNAME)
            {
                throw ADP.InvalidArgumentLength("userId", TdsEnums.MAXLEN_USERNAME);
            }

            if (password == null)
            {
                throw ADP.ArgumentNull("password");
            }

            if (password.Length > TdsEnums.MAXLEN_PASSWORD)
            {
                throw ADP.InvalidArgumentLength("password", TdsEnums.MAXLEN_PASSWORD);
            }

            if (!password.IsReadOnly())
            {
                throw ADP.MustBeReadOnly("password");
            }

            _userId = userId;
            _password = password;
        }

        //
        // PUBLIC PROPERTIES
        //
        public string UserId
        {
            get
            {
                return _userId;
            }
        }

        public SecureString Password
        {
            get
            {
                return _password;
            }
        }
    }
}   // System.Data.SqlClient namespace