Disco.Services.Interop.ActiveDirectory.ADDomain.DiscoverAvailableDomainController C# (CSharp) Method

        private ADDomainController DiscoverAvailableDomainController(bool RequireWritable)
        {
            LocatorOptions locatorOptions;
            if (RequireWritable)
                locatorOptions = LocatorOptions.ForceRediscovery | LocatorOptions.WriteableRequired;
            else
                locatorOptions = LocatorOptions.ForceRediscovery;

            var dc = this.Domain.FindDomainController(locatorOptions);

            var dcName = dc.Name;

            var existingDC = this.DomainControllers.FirstOrDefault(edc => edc.Name == dcName);

            if (existingDC != null)
            {
                // DC already in scope

                // Native API indicates writable
                if (RequireWritable)
                    existingDC.IsWritable = true;

                // Native API indicates it is available
                existingDC.IsAvailable = true;

                return existingDC;
            }
            else
            {
                // New DC discovered

                var adDC = new ADDomainController(this.context, dc, this, dc.SiteName == this.context.Site.Name, RequireWritable);

                // Add DC to Available Servers
                this.domainControllers.Push(adDC);

                return adDC;
            }
        }