MOBILE_API/Business/KftcPasswordRule/PasswordAsEmailRule.cs

namespace Business.KftcPasswordRule
{
    /// <summary>
    /// </summary>
    public class PasswordAsEmailRule : PasswordRule
    {
        /// <summary>
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public PasswordValidationResult Validate(ValidationModel model)
        {
            if (model == null)
            {
                return new PasswordValidationResult { IsValid = false, Message = "invalid password." };
            }

            if (string.IsNullOrEmpty(model.Password) || string.IsNullOrEmpty(model.Email))
            {
                return new PasswordValidationResult { IsValid = false, Message = "invalid password." };
            }
            var emailArr = model.Email.Split('@');
            if (emailArr.Length > 1)
            {
                if (model.Password.ToLower().Contains(emailArr[0].ToLower()))
                {
                    return new PasswordValidationResult { IsValid = false, Message = "Password can not be same as email!" };
                }
            }
            return new PasswordValidationResult { IsValid = true, Message = "valid" };
        }
    }
}