HTML Controls vs ASP.NET Controls in VB.NET


The main difference between HTML controls and ASP.Net controls is HTML controls never uses runtat="server" attribute to the tag. We declare HTML controls in a different way than we declare standard ASP.NET controls. The ASP.NET Framework enables us to take any HTML tag (real or imaginary) and add a runat="server" attribute to the tag. The runat="server" attribute converts the HTML tag into a server-side ASP.NET control. For example, the code given below contains a <span> tag, which has been converted into an ASP.NET control.

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<script runat="server">

    Sub Page_Load()
        timenow.InnerText = DateTime.Now.ToString("T")
    End Sub

html xmlns="" >
<head id="Head1" runat="server">
    <title>HTML Controls vs ASP.Net Controls</title>
    <form id="form1" runat="server">

    System Time :
    <span id="timenow" runat="server" />


Notice that the <span> tag given above looks just like a normal HTML <span> tag except for the addition of the runat="server" attribute. Because the <span> tag is a server-side HTML control, we can program against it. In above code, the current date and time are assigned to the <span> tag in the Page_Load() method. The HTML controls are included in the ASP.NET Framework to make it easier to convert existing HTML pages to use the ASP.NET Framework.


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