<asp:datagrid id= "dg"  runat= "server"  GridLines= "Vertical"  AutoGenerateColumns= "False" >
<Columns>
<asp:BoundColumn Visible= "False"  DataField= "some_table_ID" ></asp:BoundColumn>
<asp:TemplateColumn HeaderText= "MyField" >
        <HeaderStyle Width= "250px" ></HeaderStyle>
        <ItemTemplate>
                <asp:Label
                  runat= "server" 
                        Text='<%# getMyFieldValue(DataBinder.Eval(Container, "DataItem.MyField").ToString()) %>' >
                </asp:Label>
        </ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>

private void dg_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if ((e.Item.ItemType==ListItemType.Item) || (e.Item.ItemType==ListItemType.AlternatingItem))		
{
string sField= Convert.ToString(DataBinder.Eval(e.Item.DataItem,  "MyField" ));

if (bCondition) 
{ 
e.Item.Cells[ 0 ].Font.Bold = true;
} 
else 
{ 
// nothing to do
} 
}
}