void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
{
info.AddValue("ColumnName", ColumnName);
info.AddValue("ColumnType", ColumnType);
info.AddValue("IsNotNull", IsNotNull);
info.AddValue("IsIdentity", IsIdentity);
info.AddValue("Default", DefaultExpression);
info.AddValue("IndexType", IndexType);
}