You should be using combinations of <asp:Label> tags and input tags such as <asp:TextBox> in your forms.
The <asp:Label> tag is one of several controls that will render different html depending on the way you configure it. Its default is to turn into a <span> tag but in the scenario above the correct tag would be a <label> with a for="" attribute.
How do you do this? Just add the AssociatedControlID attribute to your control.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Label AssociatedControlID Example</title>
</head>
<body>
<form id="form1" runat="server">
<h1>Label AssociatedControlID Example</h1>
<p>Load this page into a browser and view source to see the different html markup.</p>
<h2>Label tag without an association</h2>
<asp:Label ID="Label1" runat="server" AssociatedControlID="TextBox1" Text="Label" /><br />
<asp:TextBox ID="TextBox1" runat="server" />
<h2>Label tag with an association</h2>
<asp:Label ID="Label2" runat="server" AssociatedControlID="TextBox2" Text="Label" /><br />
<asp:TextBox ID="TextBox2" runat="server" />
</form>
</body>
</html>
The benefits of this technique are two-fold. Firstly by using semantic mark-up you are staying true to the intentions of web standards. Secondly you are enhancing accessibility by giving screen readers and other devices a much better chance of matching the label with the input control.
If it isn't already - this should become a standard practice in your form development technique.
Asp.net v1.1 and older
This feature is not supported in asp.net 1.1 and older. To be a good net citizen in those versions of .net you will have to manually create a label tag and associate the for tag using inline commands such as:
<label for="<%=TextBox1.ClientID %>">Label</label> <asp:TextBox id="TextBox1" runat="server" />
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