public string Validate() { var sb = new StringBuilder(); Name = Name.ToSafeTrimmedString(); if (String.IsNullOrEmpty(Name)) { sb.AppendLine(String.Format(ErrorTexts.FieldIsEmpty, Texts.CompanyName)); } Inn = Inn.ToSafeTrimmedString(); if (String.IsNullOrEmpty(Inn)) { sb.AppendLine(String.Format(ErrorTexts.FieldIsEmpty, Texts.Inn)); } var rs = Address.Validate(); if (!String.IsNullOrEmpty(rs)) { sb.AppendLine(rs); } return(sb.ToString()); }