# Validation

If you want to ensure your data conforms to some sort of standard, you can validate it.

###### Data

    Id,Name
    1,on-e

###### Example

    void Main()
    {
        using (var reader = new StreamReader("path\\to\\file.csv"))
        using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
        {
            csv.Context.RegisterClassMap<FooMap>();
            csv.GetRecords<Foo>().ToList().Dump();
        }
    }

    public class Foo
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public DateTimeOffset? Date { get; set; }
    }

    public class FooMap : ClassMap<Foo>
    {
        public FooMap()
        {
            Map(m => m.Id);
            Map(m => m.Name).Validate(field => !field.Contains("-"));
        }
    }