public sealed class ShapeDescription : Description 

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 CreateStandAloneAnnotationFeatureClass(Geodatabase geodatabase, SpatialReference spatialReference)
{
    // Creating a Cities annotation feature class
    // with following user defined fields
    // Name 
    // GlobalID

    // Annotation feature class name
    string annotationFeatureClassName = "CitiesAnnotation";

    // Create user defined attribute fields for annotation feature class 
    FieldDescription globalIDFieldDescription = FieldDescription.CreateGlobalIDField();
    FieldDescription nameFieldDescription = FieldDescription.CreateStringField("Name", 255);

    // Create a list of all field descriptions
    List<FieldDescription> fieldDescriptions = new List<FieldDescription> { globalIDFieldDescription, nameFieldDescription };

    // Create a ShapeDescription object
    ShapeDescription shapeDescription = new ShapeDescription(GeometryType.Polygon, spatialReference);

    // Create general placement properties for Maplex engine 
    CIMMaplexGeneralPlacementProperties generalPlacementProperties =
      new CIMMaplexGeneralPlacementProperties
      {
          AllowBorderOverlap = true,
          PlacementQuality = MaplexQualityType.High,
          DrawUnplacedLabels = true,
          InvertedLabelTolerance = 1.0,
          RotateLabelWithDisplay = true,
          UnplacedLabelColor = new CIMRGBColor
          {
              R = 0,
              G = 255,
              B = 0,
              Alpha = 0.5f // Green
          }
      };

    // Create general placement properties for Standard engine

    //CIMStandardGeneralPlacementProperties generalPlacementProperties =
    //  new CIMStandardGeneralPlacementProperties
    //  {
    //    DrawUnplacedLabels = true,
    //    InvertedLabelTolerance = 3.0,
    //    RotateLabelWithDisplay = true,
    //    UnplacedLabelColor = new CIMRGBColor
    //    {
    //      R = 255, G = 0, B = 0, Alpha = 0.5f // Red
    //    } 
    //   };


    // Create annotation  label classes
    // Green label
    CIMLabelClass greenLabelClass = new CIMLabelClass
    {
        Name = "Green",
        ExpressionTitle = "Expression-Green",
        ExpressionEngine = LabelExpressionEngine.Arcade,
        Expression = "$feature.OBJECTID",
        ID = 1,
        Priority = 0,
        Visibility = true,
        TextSymbol = new CIMSymbolReference
        {
            Symbol = new CIMTextSymbol()
            {
                Angle = 45,
                FontType = FontType.Type1,
                FontFamilyName = "Tahoma",
                FontEffects = FontEffects.Normal,
                HaloSize = 2.0,

                Symbol = new CIMPolygonSymbol
                {
                    SymbolLayers = new CIMSymbolLayer[]
            {
        new CIMSolidFill
        {
          Color = CIMColor.CreateRGBColor(0, 255, 0)
        }
            },
                    UseRealWorldSymbolSizes = true
                }
            },
            MaxScale = 0,
            MinScale = 0,
            SymbolName = "TextSymbol-Green"
        },
        StandardLabelPlacementProperties = new CIMStandardLabelPlacementProperties
        {
            AllowOverlappingLabels = true,
            LineOffset = 1.0
        },
        MaplexLabelPlacementProperties = new CIMMaplexLabelPlacementProperties
        {
            AlignLabelToLineDirection = true,
            AvoidPolygonHoles = true
        }
    };

    // Blue label
    CIMLabelClass blueLabelClass = new CIMLabelClass
    {
        Name = "Blue",
        ExpressionTitle = "Expression-Blue",
        ExpressionEngine = LabelExpressionEngine.Arcade,
        Expression = "$feature.OBJECTID",
        ID = 2,
        Priority = 0,
        Visibility = true,
        TextSymbol = new CIMSymbolReference
        {
            Symbol = new CIMTextSymbol()
            {
                Angle = 45,
                FontType = FontType.Type1,
                FontFamilyName = "Consolas",
                FontEffects = FontEffects.Normal,
                HaloSize = 2.0,

                Symbol = new CIMPolygonSymbol
                {
                    SymbolLayers = new CIMSymbolLayer[]
            {
        new CIMSolidFill
        {
          Color = CIMColor.CreateRGBColor(0, 0, 255)
        }
            },
                    UseRealWorldSymbolSizes = true
                }
            },
            MaxScale = 0,
            MinScale = 0,
            SymbolName = "TextSymbol-Blue"
        },
        StandardLabelPlacementProperties = new CIMStandardLabelPlacementProperties
        {
            AllowOverlappingLabels = true,
            LineOffset = 1.0
        },
        MaplexLabelPlacementProperties = new CIMMaplexLabelPlacementProperties
        {
            AlignLabelToLineDirection = true,
            AvoidPolygonHoles = true
        }
    };

    // Create a list of labels
    List<CIMLabelClass> labelClasses = new List<CIMLabelClass> { greenLabelClass, blueLabelClass };

    // Create an annotation feature class description object to describe the feature class to create
    AnnotationFeatureClassDescription annotationFeatureClassDescription =
      new AnnotationFeatureClassDescription(annotationFeatureClassName, fieldDescriptions, shapeDescription,
        generalPlacementProperties, labelClasses)
      {
          IsAutoCreate = true,
          IsSymbolIDRequired = false,
          IsUpdatedOnShapeChange = true
      };

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

    // Add the creation of the Cities annotation feature class to the list of DDL tasks
    schemaBuilder.Create(annotationFeatureClassDescription);

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

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

public void CreateFeatureLinkedAnnotationFeatureClass(Geodatabase geodatabase, SpatialReference spatialReference)
{
    // Creating a feature-linked annotation feature class between water pipe and valve in water distribution network
    // with following user defined fields
    // PipeName 
    // GlobalID

    // Annotation feature class name
    string annotationFeatureClassName = "WaterPipeAnnotation";

    // Create user defined attribute fields for annotation feature class
    FieldDescription pipeGlobalID = FieldDescription.CreateGlobalIDField();
    FieldDescription nameFieldDescription = FieldDescription.CreateStringField("Name", 255);

    // Create a list of all field descriptions
    List<FieldDescription> fieldDescriptions = new List<FieldDescription> { pipeGlobalID, nameFieldDescription };

    // Create a ShapeDescription object
    ShapeDescription shapeDescription = new ShapeDescription(GeometryType.Polygon, spatialReference);

    // Create general placement properties for Maplex engine 
    CIMMaplexGeneralPlacementProperties generalPlacementProperties = new CIMMaplexGeneralPlacementProperties
    {
        AllowBorderOverlap = true,
        PlacementQuality = MaplexQualityType.High,
        DrawUnplacedLabels = true,
        InvertedLabelTolerance = 1.0,
        RotateLabelWithDisplay = true,
        UnplacedLabelColor = new CIMRGBColor
        {
            R = 255,
            G = 0,
            B = 0,
            Alpha = 0.5f
        }
    };

    // Create annotation  label classes
    // Green label
    CIMLabelClass greenLabelClass = new CIMLabelClass
    {
        Name = "Green",
        ExpressionTitle = "Expression-Green",
        ExpressionEngine = LabelExpressionEngine.Arcade,
        Expression = "$feature.OBJECTID",
        ID = 1,
        Priority = 0,
        Visibility = true,
        TextSymbol = new CIMSymbolReference
        {
            Symbol = new CIMTextSymbol()
            {
                Angle = 45,
                FontType = FontType.Type1,
                FontFamilyName = "Tahoma",
                FontEffects = FontEffects.Normal,
                HaloSize = 2.0,

                Symbol = new CIMPolygonSymbol
                {
                    SymbolLayers = new CIMSymbolLayer[]
            {
        new CIMSolidFill
        {
          Color = CIMColor.CreateRGBColor(0, 255, 0)
        }
            },
                    UseRealWorldSymbolSizes = true
                }
            },
            MaxScale = 0,
            MinScale = 0,
            SymbolName = "TextSymbol-Green"
        },
        StandardLabelPlacementProperties = new CIMStandardLabelPlacementProperties
        {
            AllowOverlappingLabels = true,
            LineOffset = 1.0
        },
        MaplexLabelPlacementProperties = new CIMMaplexLabelPlacementProperties
        {
            AlignLabelToLineDirection = true,
            AvoidPolygonHoles = true
        }
    };

    // Blue label
    CIMLabelClass blueLabelClass = new CIMLabelClass
    {
        Name = "Blue",
        ExpressionTitle = "Expression-Blue",
        ExpressionEngine = LabelExpressionEngine.Arcade,
        Expression = "$feature.OBJECTID",
        ID = 2,
        Priority = 0,
        Visibility = true,
        TextSymbol = new CIMSymbolReference
        {
            Symbol = new CIMTextSymbol()
            {
                Angle = 45,
                FontType = FontType.Type1,
                FontFamilyName = "Consolas",
                FontEffects = FontEffects.Normal,
                HaloSize = 2.0,

                Symbol = new CIMPolygonSymbol
                {
                    SymbolLayers = new CIMSymbolLayer[]
            {
        new CIMSolidFill
        {
          Color = CIMColor.CreateRGBColor(0, 0, 255)
        }
            },
                    UseRealWorldSymbolSizes = true
                }
            },
            MaxScale = 0,
            MinScale = 0,
            SymbolName = "TextSymbol-Blue"
        },
        StandardLabelPlacementProperties = new CIMStandardLabelPlacementProperties
        {
            AllowOverlappingLabels = true,
            LineOffset = 1.0
        },
        MaplexLabelPlacementProperties = new CIMMaplexLabelPlacementProperties
        {
            AlignLabelToLineDirection = true,
            AvoidPolygonHoles = true
        }
    };

    // Create a list of labels
    List<CIMLabelClass> labelClasses = new List<CIMLabelClass> { greenLabelClass, blueLabelClass };


    // Create linked feature description
    // Linked feature class name
    string linkedFeatureClassName = "WaterPipe";

    // Create fields for water pipe
    FieldDescription waterPipeGlobalID = FieldDescription.CreateGlobalIDField();
    FieldDescription pipeName = FieldDescription.CreateStringField("PipeName", 255);

    // Create a list of water pipe field descriptions
    List<FieldDescription> pipeFieldDescriptions = new List<FieldDescription> { waterPipeGlobalID, pipeName };

    // Create a linked feature class description
    FeatureClassDescription linkedFeatureClassDescription = new FeatureClassDescription(linkedFeatureClassName, pipeFieldDescriptions,
      new ShapeDescription(GeometryType.Polyline, spatialReference));

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

    // Add the creation of the linked feature class to the list of DDL tasks
    FeatureClassToken linkedFeatureClassToken = schemaBuilder.Create(linkedFeatureClassDescription);

    // Create an annotation feature class description object to describe the feature class to create
    AnnotationFeatureClassDescription annotationFeatureClassDescription =
      new AnnotationFeatureClassDescription(annotationFeatureClassName, fieldDescriptions, shapeDescription,
        generalPlacementProperties, labelClasses, new FeatureClassDescription(linkedFeatureClassToken))
      {
          IsAutoCreate = true,
          IsSymbolIDRequired = false,
          IsUpdatedOnShapeChange = true
      };

    // Add the creation of the annotation feature class to the list of DDL tasks
    schemaBuilder.Create(annotationFeatureClassDescription);

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

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