// Creating a FeatureDataset named as 'Parcel_Information'
SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);
// Create a FeatureDataset named as 'Parcel Information'
FeatureDatasetDescription featureDatasetDescription =
new FeatureDatasetDescription("Parcel_Information", SpatialReferences.WGS84);
schemaBuilder.Create(featureDatasetDescription);
// Build status
bool buildStatus = schemaBuilder.Build();
// Build errors
if (!buildStatus)
{
IReadOnlyList<string> errors = schemaBuilder.ErrorMessages;
}