internal NuGetPackageSourceBuilder(NuGetPackageSourceCollection service, NuGetPackageSource edit)
 {
     this.service = service;
     this.edit    = edit;
     this.name    = edit.Name;
     this.uri     = edit.Uri;
 }
 internal NuGetPackageSourceBuilder(NuGetPackageSourceCollection service)
 {
     this.service = service;
 }