主题：这样写报错.

Dim qd As String
Dim dr As DataRow = DataTables("附件").SQLFind("编号 = '001' And CONVERT (VARCHAR (100),操作时间, 23 ) = '2015-06-03 10:48:49'")
qd = dr.SQLGetValue("附件内容")
Dim pbx As WinForm.PictureBox = e.Form.Controls("PictureBox1")
pbx.ImageFile =qd

这样写怎么读取不到附件表中的附件内容呢,空际上附件内容是有值的.