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# Optional Maps
If you have data that may or may not have a header, you can make the mapping optional.
###### Data
```
Id,Name
1,one
```
###### Example
```cs
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);
Map(m => m.Date).Optional();
}
}
```
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