SqlClientPermission
Enables the .NET Framework Data Provider for SQL Server to help make sure that a user has a security level sufficient to access a data source.
                using System.Data.Common;
using System.Security;
using System.Security.Permissions;
namespace System.Data.SqlClient
{
    public sealed class SqlClientPermission : DBDataPermission
    {
        public SqlClientPermission()
            : base(PermissionState.None)
        {
        }
        public SqlClientPermission(PermissionState state)
            : base(PermissionState.None)
        {
        }
        public SqlClientPermission(PermissionState state, bool allowBlankPassword)
            : base(PermissionState.None)
        {
        }
        public override void Add(string connectionString, string restrictions, KeyRestrictionBehavior behavior)
        {
        }
        public override IPermission Copy()
        {
            return null;
        }
    }
}