/// <summary>
/// Returns a thread safe instance.
/// </summary>
public static InvoiceServiceAgent Instance()
{
if (_instance.IsNull()) {
lock (_lock) {
Thread.MemoryBarrier();
if (_instance.IsNull()) {
_instance = new InvoiceServiceAgent();
}
}
}
return _instance;
}
/// <summary>
/// Returns a thread safe instance.
/// </summary>
public static InvoiceServiceAgent Instance()
{
if (_instance.IsNull())
{
lock (_lock) {
Thread.MemoryBarrier();
if (_instance.IsNull())
{
_instance = new InvoiceServiceAgent();
}
}
}
return(_instance);
}