BaseClass.cs

public class BaseClass : TableEntity
{
    public string PartitionKey { get; set; }
    public string RowKey { get; set; }
    public DateTimeOffset Timestamp { get; set; }
    public string ETag { get; set; }

    public BaseClass()
    {
    }

    public BaseClass(String partitionKey, String rowKey) : base(partitionKey, rowKey)
    {
    }

    public override IDictionary<String, EntityProperty> WriteEntity(OperationContext operationContext)
    {
        var properties = base.WriteEntity(operationContext);
        var property = new EntityProperty(GetType().FullName);
        properties.Add("Type", property);

        return properties;
    }
}