public class FeatureClassDescription : TableDescription 

FieldDescription bigIntegerFieldDescription = new FieldDescription("BigInteger_64", FieldType.BigInteger);

// 64-bit
FieldDescription oidFieldDescription_64 = new FieldDescription("ObjectID_64", FieldType.OID)
{
    Length = 8
};

// 32-bit
FieldDescription oidFieldDescription_32 = new FieldDescription("ObjectID_32", FieldType.OID)
{
    Length = 4
};

// Earthquake occurrences date and time

// 9/28/2014 (DateOnly)
FieldDescription earthquakeDateOnlyFieldDescription = new FieldDescription("Earthquake_DateOnly", FieldType.DateOnly);

// 1:16:42 AM (TimeOnly)
FieldDescription earthquakeTimeOnlyFieldDescription = new FieldDescription("Earthquake_TimeOnly", FieldType.TimeOnly);

// 9/28/2014 1:16:42.000 AM -09:00 (Timestamp with Offset)
FieldDescription earthquakeTimestampOffsetFieldDescription = new FieldDescription("Earthquake_TimestampOffset_Local", FieldType.TimestampOffset);

// 9/28/2014 1:16:42 AM (DateTime)
FieldDescription earthquakeDateFieldDescription = new FieldDescription("Earthquake_Date", FieldType.Date);

public void CreateFeatureDatasetWithFeatureClassSnippet(Geodatabase geodatabase)
{
    // 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;
    }
}

public void CreateFeatureClassInsideFeatureDatasetSnippet(Geodatabase geodatabase)
{
    // 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;
    }
}

public void AddFieldWithDomainSnippet(Geodatabase geodatabase)
{
    // Adding a field,'PipeType', which uses the coded value domain to the 'Pipes' FeatureClass

    //The FeatureClass to add field
    string featureClassName = "Pipes";

    SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

    // Create a CodedValueDomain description for water pipes
    CodedValueDomainDescription pipeDomainDescription =
      new CodedValueDomainDescription("WaterPipeTypes", FieldType.String,
      new SortedList<object, string> { { "C_1", "Copper" },
  { "S_2", "Steel" } })
      {
          SplitPolicy = SplitPolicy.Duplicate,
          MergePolicy = MergePolicy.DefaultValue
      };

    // Create a coded value domain token
    CodedValueDomainToken codedValueDomainToken = schemaBuilder.Create(pipeDomainDescription);

    // Create a new description from domain token
    CodedValueDomainDescription codedValueDomainDescription = new CodedValueDomainDescription(codedValueDomainToken);

    // Create a field named as 'PipeType' using a domain description
    FieldDescription domainFieldDescription = new FieldDescription("PipeType", FieldType.String);
    domainFieldDescription.SetDomainDescription(codedValueDomainDescription);

    //Retrieve existing information for 'Pipes' FeatureClass
    FeatureClassDefinition originalFeatureClassDefinition = geodatabase.GetDefinition<FeatureClassDefinition>(featureClassName);
    FeatureClassDescription originalFeatureClassDescription =
      new FeatureClassDescription(originalFeatureClassDefinition);

    // Add domain field on existing fields
    List<FieldDescription> modifiedFieldDescriptions = new List<FieldDescription>(originalFeatureClassDescription.FieldDescriptions) { domainFieldDescription };

    // Create a new description with updated fields for 'Pipes' FeatureClass 
    FeatureClassDescription featureClassDescription =
      new FeatureClassDescription(originalFeatureClassDescription.Name, modifiedFieldDescriptions,
                                     originalFeatureClassDescription.ShapeDescription);

    // Update the 'Pipes' FeatureClass with domain field
    schemaBuilder.Modify(featureClassDescription);

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

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