Sample code to show capturing a validation error in the XeroAPI.Net wrapper library

gistfile1.cs

// Try and create an invoice - but using incorrect data. This should hopefully be rejected by the Xero API
Invoice invoiceToCreate = new Invoice
{
    Contact = contact,
    Type = "ACCREC",
    Date = DateTime.Today,
    LineItems = new LineItems
    {
        new LineItem
        {
            AccountCode = "200",
            Description = "Blue Widget",
            UnitAmount = 10m,
            TaxAmount = 2m,
            LineAmount = 12m
        }
    }
};

var createdInvoice = repository.Create(invoiceToCreate);

if (createdInvoice.ValidationStatus == ValidationStatus.ERROR)
{
    foreach (var message in createdInvoice.ValidationErrors)
    {
        Console.WriteLine("Validation Error: " + message.Message);
    }
}