public override string ToString()
{
StringBuilder sb = new StringBuilder("add_index_args(");
sb.Append("New_index: ");
sb.Append(New_index == null ? "<null>" : New_index.ToString());
sb.Append(",Index_table: ");
sb.Append(Index_table == null ? "<null>" : Index_table.ToString());
sb.Append(")");
return sb.ToString();
}