SqlClientPermissionAttribute
Associates a security action with a custom security attribute.
                using System.Data.Common;
using System.Security;
using System.Security.Permissions;
namespace System.Data.SqlClient
{
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
    public sealed class SqlClientPermissionAttribute : DBDataPermissionAttribute
    {
        public SqlClientPermissionAttribute(SecurityAction action)
            : base((SecurityAction)0)
        {
        }
        public override IPermission CreatePermission()
        {
            return null;
        }
    }
}