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

<html>
<head>
<title>DataList ItemCommand Event Example</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 ) {
      string query = "SELECT * FROM Employees";
      myDataList.DataSource = fetchData ( query );
      myDataList.DataBind ( );
   }
}

void showItem ( Object src, DataListCommandEventArgs e ) {
   myDataList.SelectedIndex = e.Item.ItemIndex;
   string query = "SELECT * FROM Employees";
   myDataList.DataSource = fetchData ( query );
   myDataList.DataBind ( );
}
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>DataList ItemCommand Event Example</h2></div>

<hr size=1 width=92%>

<div align="center">
<form runat="server">
   <asp:datalist id="myDataList" runat="server"
      width="92%" cellpadding=5 repeatcolumns=3
      backcolor="ghostwhite"
      headerstyle-backcolor="lightsteelblue"
      headerstyle-font-bold
      itemstyle-verticalalign="top"
      selecteditemstyle-backcolor="khaki"
      onItemCommand="showItem">

      <headertemplate>
         NorthWind Traders Employees
      </headertemplate>

      <itemtemplate>
         <asp:linkbutton runat="server"
            text='<%# Eval ( "LastName" ) %>' />
      </itemtemplate>
   
      <selecteditemtemplate>
         <img align="right" width=75 runat="server" 
            src='<%# Eval ( "LastName", 
            "~/shared/images/{0}.jpg" ) %>' />
         <b><%# Eval ( "FirstName" ) %>
         <%# Eval ( "LastName" ) %></b><br>
         <%# Eval ( "Title" ) %><br>
         <%# Eval ( "Address" ) %>, 
         <%# Eval ( "City" ) %>
      </selecteditemtemplate>

   </asp:datalist>

</form>
</div>

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

</body>
</html>