MemberhipCreateStatus.InvalidPassword If I Pass A Simple Word

After disassembling SqlMembershipProvider, it throws InvalidPassword in the following cases - marked **

My guess is, check if you are redefining the membership of Provider.ValidatingPassword Event

  public override MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out MembershipCreateStatus status)
{
    string str3;
    MembershipUser user;
    if (!SecUtility.ValidateParameter(ref password, true, true, false, 0x80))
    {
        status = **MembershipCreateStatus.InvalidPassword**;
        return null;
    }
    string salt = this.GenerateSalt();
    string objValue = this.EncodePassword(password, (int) this._PasswordFormat, salt);
    if (objValue.Length > 0x80)
    {
        status = **MembershipCreateStatus.InvalidPassword**;
        return null;
    }
    if (passwordAnswer != null)
    {
        passwordAnswer = passwordAnswer.Trim();
    }
    if (!string.IsNullOrEmpty(passwordAnswer))
    {
        if (passwordAnswer.Length > 0x80)
        {
            status = MembershipCreateStatus.InvalidAnswer;
            return null;
        }
        str3 = this.EncodePassword(passwordAnswer.ToLower(CultureInfo.InvariantCulture), (int) this._PasswordFormat, salt);
    }
    else
    {
        str3 = passwordAnswer;
    }
    if (!SecUtility.ValidateParameter(ref str3, this.RequiresQuestionAndAnswer, true, false, 0x80))
    {
        status = MembershipCreateStatus.InvalidAnswer;
        return null;
    }
    if (!SecUtility.ValidateParameter(ref username, true, true, true, 0x100))
    {
        status = MembershipCreateStatus.InvalidUserName;
        return null;
    }
    if (!SecUtility.ValidateParameter(ref email, this.RequiresUniqueEmail, this.RequiresUniqueEmail, false, 0x100))
    {
        status = MembershipCreateStatus.InvalidEmail;
        return null;
    }
    if (!SecUtility.ValidateParameter(ref passwordQuestion, this.RequiresQuestionAndAnswer, true, false, 0x100))
    {
        status = MembershipCreateStatus.InvalidQuestion;
        return null;
    }
    if ((providerUserKey != null) && !(providerUserKey is Guid))
    {
        status = MembershipCreateStatus.InvalidProviderUserKey;
        return null;
    }
    if (password.Length < this.MinRequiredPasswordLength)
    {
        status = **MembershipCreateStatus.InvalidPassword**;
        return null;
    }
    int num = 0;
    for (int i = 0; i < password.Length; i++)
    {
        if (!char.IsLetterOrDigit(password, i))
        {
            num++;
        }
    }
    if (num < this.MinRequiredNonAlphanumericCharacters)
    {
        status = **MembershipCreateStatus.InvalidPassword**;
        return null;
    }
    if ((this.PasswordStrengthRegularExpression.Length > 0) && !Regex.IsMatch(password, this.PasswordStrengthRegularExpression))
    {
        status = **MembershipCreateStatus.InvalidPassword**;
        return null;
    }
    ValidatePasswordEventArgs e = new ValidatePasswordEventArgs(username, password, true);
    this.OnValidatingPassword(e);
    if (e.Cancel)
    {
        status = **MembershipCreateStatus.InvalidPassword**;
        return null;
    }
    try
    {
        SqlConnectionHolder connection = null;
        try
        {
            connection = SqlConnectionHelper.GetConnection(this._sqlConnectionString, true);
            this.CheckSchemaVersion(connection.Connection);
            DateTime time = this.RoundToSeconds(DateTime.UtcNow);
            SqlCommand command = new SqlCommand("dbo.aspnet_Membership_CreateUser", ....

            command.Parameters.Add(parameter);
            try
            {
                command.ExecuteNonQuery();
            }
            catch (SqlException exception)
            {
                if (((exception.Number != 0xa43) && (exception.Number != 0xa29)) && (exception.Number != 0x9d0))
                {
                    throw;
                }
                status = MembershipCreateStatus.DuplicateUserName;
                return null;
            }
            int num3 = (parameter.Value != null) ? ((int) parameter.Value) : -1;
            if ((num3 < 0) || (num3 > 11))
            {
                num3 = 11;
            }
            status = (MembershipCreateStatus) num3;
            if (num3 != 0)
            {
                return null;
            }
            providerUserKey = new Guid(command.Parameters["@UserId"].Value.ToString());
            time = time.ToLocalTime();
            user = new MembershipUser(this.Name, username, providerUserKey, email, passwordQuestion, null, isApproved, false, time, time, time, time, new DateTime(0x6da, 1, 1));
        }
        finally
        {
            if (connection != null)
            {
                connection.Close();
                connection = null;
            }
        }
    }
    catch
    {
        throw;
    }
    return user;
}


internal static bool ValidateParameter(ref string param, bool checkForNull, bool checkIfEmpty, bool checkForCommas, int maxSize)
{
    if (param == null)
    {
        return !checkForNull;
    }
    param = param.Trim();
    return (((!checkIfEmpty || (param.Length >= 1)) && ((maxSize <= 0) || (param.Length <= maxSize))) && (!checkForCommas || !param.Contains(",")));
}