public class PersonDto
    {      
        [ExcelTableColumn("First name")]
        [Required(ErrorMessage = "First name cannot be empty.")]
        [MaxLength(50, ErrorMessage = "First name cannot be more than {1} characters.")] 
        public string FirstName { get; set; }

        [ExcelTableColumn("Last name")]       
        public string LastName { get; set; }
        
        [ExcelTableColumn(3)]
        [Range(1900, 2050, ErrorMessage = "Please enter a value bigger than {1}")]
        public int YearBorn { get; set; }
        
        public decimal NotMapped { get; set; }
    }
    
// Converting from Excel to list of objects

    // Direct usage: 
        excelPackage.ToList<PersonDto>(configuration => configuration.SkipCastingErrors());

    // Specific worksheet: 
        excelPackage.GetWorksheet("Persons").ToList<PersonDto>();  
    
// From list to Excel package

    List<PersonDto> persons = new List<PersonDto>();

    // Direct usage
        ExcelPackage excelPackage = persons.ToExcelPackage();
        byte[] excelPackageXlsx = persons.ToXlsx();
       
    // With configuration

    List<PersonDto> pre50 = persons.Where(x => x.YearBorn < 1950).ToList();
    List<PersonDto> post50 = persons.Where(x => x.YearBorn >= 1950).ToList();
        
    ExcelPackage excelPackage = pre50.ToWorksheet("< 1950")
                             .WithConfiguration(configuration => configuration.WithColumnConfiguration(x => x.AutoFit()))
                             .WithColumn(x => x.FirstName, "First Name")
                             .WithColumn(x => x.LastName, "Last Name")
                             .WithColumn(x => x.YearBorn, "Year of Birth")
                             .WithTitle("< 1950")
                             .NextWorksheet(post50, "> 1950")
                             .WithColumn(x => x.LastName, "Last Name")
                             .WithColumn(x => x.YearBorn, "Year of Birth")
                             .WithTitle("> 1950")
                             .ToExcelPackage();