HyperLinkColumnImageUrl.aspx font size:
<%@ Import Namespace="System.Data" %>

<html>
<head>
<title>Dynamically Generated HyperLinkColumn Images</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
   public void getImages ( Object src, DataGridItemEventArgs e ) {
      if ( e.Item.ItemType == ListItemType.Item || 
            e.Item.ItemType == ListItemType.AlternatingItem ) {
         DataRowView rowView = ( DataRowView ) e.Item.DataItem;
         string planId = rowView [ "PlanId" ].ToString ( );

         TableCellCollection myCells = e.Item.Cells;
         HyperLink planLink = ( HyperLink ) myCells [ myCells.Count - 1 ].Controls [ 0 ];
         planLink.ImageUrl = string.Format ( "~/shared/images/plans/thumbs/{0}.jpg", planId );
         planLink.ToolTip = rowView [ "Model" ].ToString ( );
      }
   }

   void setPage ( Object src, DataGridPageChangedEventArgs e ) {
      // set CurrentPageIndex to the page the user clicked.
      myGrid.CurrentPageIndex = e.NewPageIndex;

      // rebind the data
      myGrid.DataBind ( );
   }
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>Dynamically Generated HyperLinkColumn Images</h2></div>
<hr size=1 width=92%>

<div align="center">
<form runat="server">
   <asp:datagrid id="myGrid" runat="server"
      datasourceid="plans"
      width=96% cellpadding=5 font-size="9pt"
      gridlines="horizontal"
      showheader=false
      autogeneratecolumns=false
      allowpaging pagesize=5
      onItemDataBound="getImages"
      onPageIndexChanged="setPage">

      <itemstyle backcolor="ghostwhite" verticalalign="top" />

      <pagerstyle
         backcolor="darkslategray"
         forecolor="khaki"
         font-bold
         horizontalalign="right"
         position="topandbottom"
         mode="numericpages"
         nextpagetext="Next" prevpagetext="Prev" />

      <columns>

         <asp:boundcolumn
            datafield="Design" />
         <asp:boundcolumn
            datafield="Model" 
            itemstyle-forecolor="navy"
            itemstyle-font-size="10pt"
            itemstyle-font-bold />
         <asp:boundcolumn
            datafield="Description" />
         <asp:boundcolumn
            datafield="PlanID"
            itemstyle-horizontalalign="right" />

         <asp:hyperlinkcolumn
            datanavigateurlfield="planid"
            datanavigateurlformatstring="plan_details.aspx?id={0}" />

      </columns>

   </asp:datagrid>

   <asp:accessdatasource id="plans" runat="server"
      datafile="~/app_data/plans.mdb"
      selectcommand="SELECT Design, Model, Description, PlanId FROM Plans 
         WHERE Type in ( 'English', 'French', 'Tudor', 'Victorian' )" />

</form>
</div>

<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>