How to use utf16 with .net

[freefly pan]

I creat a table by:
CREATE TABLE test(Name VARCHAR(512) CHARSET utf16) ENGINE=INNODB CHARSET=utf16;

I test in default sample: Connector NET 6.6.5\Samples\Table Editor\cs

this is samples code:

data = new DataTable();
da = new MySqlDataAdapter("SELECT * FROM " + tables.SelectedItem.ToString(), conn);
cb = new MySqlCommandBuilder(da);
da.Fill(data); //error:long time no response

Mysql version:5.6.11

How can I do to use utf16