GridViewBoundField.aspx font size:
C# source: GridViewBoundField.aspx   fetchData_sql.cs   
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>

<html>
<head>
<title>GridView BoundField Example</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server" src="fetchData_oledb.cs" />

<script language="C#" runat="server">
   void Page_Load ( Object src, EventArgs e ) {
      if ( !IsPostBack ) {
         string query = "SELECT * FROM products";
         myGrid.DataSource = fetchReader ( query, "dbtutor" );
         myGrid.DataBind ( );
      }
   }
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>GridView <span class="hilite">BoundField</span> Example</h2></div>
<hr size=1 width=92%>

<form runat="server">
<div align="center">

   <asp:gridview id="myGrid" runat="server"
      width=90% cellpadding=5
      font-size="9pt"
      autogeneratecolumns=false
      enableviewstate=false>

      <headerstyle backcolor="steelblue"
         forecolor="beige" />

      <rowstyle verticalalign="top" />

      <columns>
         <asp:boundfield headertext="Type"
            datafield="ProductType" />
         <asp:boundfield headertext="Brand/Model"
            datafield="ProductName" />
         <asp:boundfield headertext="Description"
            datafield="ProductDescription" />
         <asp:boundfield headertext="Price"
            datafield="UnitPrice"
            htmlencode=false
            dataformatstring="{0:n2}"
            itemstyle-horizontalalign="right" />
      </columns>

   </asp:gridview>

</div>

</form>

<hr size=1 width=92%>
<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>