TextModeMultiLine.aspx font size:
<html>
<head>
<title>TextNode MultiLine Example</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
   protected void SubmitButton_Click ( Object src, EventArgs e ) {
      msg.Text = "Thank you for your comment: <br>" + comments.Text;
   }

   protected void Check_Change ( Object src, EventArgs e ) {
      comments.Wrap = wrapCheckBox.Checked;
      comments.ReadOnly = readOnlyCheckBox.Checked;
   }

</script>

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

<hr size=1 width=92%>

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

   <p>Please enter a comment and click the submit button. </p>

   <asp:textbox id="comments"
      textmode="multiline"
      columns=30
      rows=8
      runat="server" />

   <asp:requiredfieldvalidator
      id="Value1RequiredValidator"
      controltovalidate="comments"
      errormsg="Please enter a comment.<br>"
      display="Dynamic"
      runat="server" />                      

   <p><asp:checkbox id="wrapCheckBox"
      text="Wrap Text"
      checked="True"
      autopostback="True"
      oncheckedchanged="Check_Change"
      runat="server" />

   <asp:checkbox id="readOnlyCheckBox"
      text="ReadOnly"
      checked="False"
      autopostback="True"
      oncheckedchanged="Check_Change"
      runat="server" /></p>

   <asp:button id="SubmitButton"
      text="Submit"
      onclick="SubmitButton_Click"
      runat="server" />

   <p><asp:label id="msg" runat="server" /></p>

</div>
</form>

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

</body>
</html>