If you can make sure the field names and properties of the object with the same name, try this:
public IEnumerable<T> Fill<T>(DataTable dt)
where T : new()
{
return dt.AsEnumerable().Select(row =>
{
var obj = new T();
var properties =
from p in obj.GetType().GetProperties()
join c in dt.Columns.Cast<DataColumn>() on p.Name equals c.ColumnName
select new {p, c};
foreach (var item in properties)
item.p.SetValue(obj, row[item.c]);
return obj;
});
}