public sealed class FieldDescription : Description 

// Create a PoleInspection table with the following fields
//  GlobalID
//  ObjectID
//  InspectionDate (date)
//  InspectionResults (pre-existing InspectionResults coded value domain)
//  InspectionNotes (string)

// This static helper routine creates a FieldDescription for a GlobalID field with default values
FieldDescription globalIDFieldDescription = FieldDescription.CreateGlobalIDField();

// This static helper routine creates a FieldDescription for an ObjectID field with default values
FieldDescription objectIDFieldDescription = FieldDescription.CreateObjectIDField();

// Create a FieldDescription for the InspectionDate field
FieldDescription inspectionDateFieldDescription = new FieldDescription("InspectionDate", FieldType.Date)
{
  AliasName = "Inspection Date"
};

// This static helper routine creates a FieldDescription for a Domain field (from a pre-existing domain)
FieldDescription inspectionResultsFieldDescription = FieldDescription.CreateDomainField("InspectionResults", new CodedValueDomainDescription(inspectionResultsDomain));
inspectionResultsFieldDescription.AliasName = "Inspection Results";

// This static helper routine creates a FieldDescription for a string field
FieldDescription inspectionNotesFieldDescription = FieldDescription.CreateStringField("InspectionNotes", 512);
inspectionNotesFieldDescription.AliasName = "Inspection Notes";

// Assemble a list of all of our field descriptions
List<FieldDescription> fieldDescriptions = new List<FieldDescription>()
  { globalIDFieldDescription, objectIDFieldDescription, inspectionDateFieldDescription, inspectionResultsFieldDescription, inspectionNotesFieldDescription };

// Create a TableDescription object to describe the table to create
TableDescription tableDescription = new TableDescription("PoleInspection", fieldDescriptions);

// Create a SchemaBuilder object
SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

// Add the creation of PoleInspection to our list of DDL tasks
schemaBuilder.Create(tableDescription);

// Execute the DDL
bool success = schemaBuilder.Build();

// Inspect error messages
if (!success)
{
  IReadOnlyList<string> errorMessages = schemaBuilder.ErrorMessages;
  //etc.
}

// Creating a FeatureDataset named as 'Parcel_Information' and a FeatureClass with name 'Parcels' in one operation

string featureDatasetName = "Parcel_Information";
string featureClassName = "Parcels";

SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

// Create a FeatureDataset token
FeatureDatasetDescription featureDatasetDescription = new FeatureDatasetDescription(featureDatasetName, SpatialReferences.WGS84);
FeatureDatasetToken featureDatasetToken = schemaBuilder.Create(featureDatasetDescription);

// Create a FeatureClass description
FeatureClassDescription featureClassDescription = new FeatureClassDescription(featureClassName,
  new List<FieldDescription>()
  {
    new FieldDescription("Id", FieldType.Integer),
    new FieldDescription("Address", FieldType.String)
  },
  new ShapeDescription(GeometryType.Point, SpatialReferences.WGS84));

// Create a FeatureClass inside a FeatureDataset
FeatureClassToken featureClassToken = schemaBuilder.Create(new FeatureDatasetDescription(featureDatasetToken), featureClassDescription);

// Build status
bool buildStatus = schemaBuilder.Build();

// Build errors
if (!buildStatus)
{
  IReadOnlyList<string> errors = schemaBuilder.ErrorMessages;
}

// Creating a FeatureClass named as 'Tax_Jurisdiction' in existing FeatureDataset with name 'Parcels_Information'
string featureDatasetName = "Parcels_Information";
string featureClassName = "Tax_Jurisdiction";

// Create a FeatureClass description
FeatureClassDescription featureClassDescription = new FeatureClassDescription(featureClassName,
  new List<FieldDescription>()
  {
    new FieldDescription("Tax_Id", FieldType.Integer),
    new FieldDescription("Address", FieldType.String)
  },
  new ShapeDescription(GeometryType.Point, SpatialReferences.WGS84));

FeatureDatasetDefinition featureDatasetDefinition = geodatabase.GetDefinition<FeatureDatasetDefinition>(featureDatasetName);

SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

// Create a FeatureClass inside a FeatureDataset using a FeatureDatasetDefinition
schemaBuilder.Create(new FeatureDatasetDescription(featureDatasetDefinition), featureClassDescription);

// Build status
bool buildStatus = schemaBuilder.Build();

// Build errors
if (!buildStatus)
{
  IReadOnlyList<string> errors = schemaBuilder.ErrorMessages;
}

// Removing all fields from 'Parcels' table except following 
// Tax_Code
// Parcel_Address


// The table to remove fields
string tableName = "Parcels";

TableDefinition tableDefinition = geodatabase.GetDefinition<TableDefinition>(tableName);
IReadOnlyList<Field> fields = tableDefinition.GetFields();

// Existing fields from 'Parcels' table
Field taxCodeField = fields.First(f => f.Name.Equals("Tax_Code"));
Field parcelAddressField = fields.First(f => f.Name.Equals("Parcel_Address"));

FieldDescription taxFieldDescription = new FieldDescription(taxCodeField);
FieldDescription parcelAddressFieldDescription = new FieldDescription(parcelAddressField);

// Fields to retain in modified table
List<FieldDescription> fieldsToBeRetained = new List<FieldDescription>()
{
  taxFieldDescription, parcelAddressFieldDescription
};

// New description of the 'Parcels' table with the 'Tax_Code' and 'Parcel_Address' fields
TableDescription modifiedTableDescription = new TableDescription(tableName, fieldsToBeRetained);

SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

// Remove all fields except the 'Tax_Code' and 'Parcel_Address' fields
schemaBuilder.Modify(modifiedTableDescription);
schemaBuilder.Build();