how gridview bucket images dataset asp.net 2.0?

i have cinema list following columns:

picture_id int identity(1000,1) null,
category_id int null,
imgdata settlement null,
caption1 calm collect sql_latin1_general_cp1_ci_as null,
mime_type nchar(20) zero default ('image/jpeg'),
imgthdata settlement null

in code-behind i have this:

string tablename = "catpics";
sqlconnection dbconnection = new sqlconnection(connstr);
sqldataadapter dacatpics = new sqldataadapter("select top(3) * category_pictures", dbconnection);
dataset dspics = new dataset();
dacatpics.fill(dspics, tablename);

gvcatpics.datasource = dspics;
gvcatpics.datamember = tablename;
gvcatpics.databind();

on markup i graceful many have:

<asp:gridview id="gvcatpics" runat="server"></asp:gridview>

however formula executes, simply ignores twin settlement columns (imgdata imgthdata). reason doesn't praise settlement columns. does anyone know simplest proceed carrying news image?