DataGridCellPadding.aspx font size:
C# Source: DataGridCellPadding.aspx   fetchData_sql.cs   
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>


<html>
<head>
<title>DataGrid CellPadding Property</title>
<link rel="stylesheet" href="/shared/netdemos.css">

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

<script language="C#" runat="server">
void Page_Load ( Object src, EventArgs e ) {
   if ( !IsPostBack ) {
      for ( int i=1; i <= 15; i+=2 ) {
         PadSelect.Items.Add ( i.ToString ( ) );
      }
      PadSelect.SelectedIndex = 2;

      string query = "SELECT Lastname, Firstname, Address, City, Country FROM Employees";
      myGrid.DataSource = fetchData ( query );
      myGrid.DataBind ( );
   }
   myGrid.CellPadding = int.Parse ( PadSelect.SelectedItem.Text );
}
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>DataGrid CellPadding Property</h2></div>

<hr size=1 width=92%>

<div align="center">

<h5><i>CellPadding</i> refers to the space between a DataGrid cell's content and 
its borders.</h5>

<form runat="server">
   <p>Select cellpadding ( in pixels )
      <asp:dropdownlist id="PadSelect" autopostback runat="server" /></p>

   <asp:datagrid id="myGrid" runat="server"
      width="95%"
      font-size="9pt"
      headerstyle-backcolor="lightsteelblue"
      headerstyle-font-bold
      backcolor="ghostwhite" />

</form>
</div>

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

</body>
</html>