If you're using Visual Studio 2010 to create Web applications, you probably have found out that the default Web templates for ASP.NET Web Forms and Master pages and plain HTML pages all create HTML 4 XHTML headers like this: <% @ Page Language ='C#' AutoEventWireup ='true' CodeBehind ='$fileinputname$.aspx.cs' Inherits ='$rootnamespace$.$classname$'%>

DOCTYPE html > Wouldn't it be nice if this was the default? If you have a few minutes it's easy to change the stock templates in Visual Studio, or if you prefer you can create your own custom templates to exactly suit your needs. Stock templates in Visual Studio 2010 All the default document types in Visual Studio are based on templates which are stored conveniently in.zip files.

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The folder where Visual Studio stores its HTML templates for Web Application Projects lives in this location: C: Program Files (x86) Visual Studio 2010 Common7 IDE ItemTemplates CSharp Web 1033 If you're using Web Site project the location is: C: Program Files (x86) Visual Studio 2010 Common7 IDE ItemTemplates Web CSharp 1033 There are a ton of templates in both folders. For WebForms the one we want is - not surprisingly - WebForms.zip. If you open up WebForm.zip with your favorite Zip tool (or Explorer) you'll see something like this for Web Application Projects: You can see the three templates - the ASPX,.cs and designer files in the zip file. You can edit all of these, but for our purpose here I'll just change the HTML header. If I open the default.aspx page you see the following default markup: <% @ Page Language ='C#' AutoEventWireup ='true' CodeBehind ='$fileinputname$.aspx.cs' Inherits ='$rootnamespace$.$classname$'%>

DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' ' It's a template so you see a few template expressions like $fileinputname$ and $rootnamespace$ in the document. Visual Studio fills those values in when the template is loaded and a new item added to a project. However, the rest of the document can be changed to your heart's delight. For the basic WebForms template I simply added the HTML 5 doctype header like this: <% @ Page Language ='C#' AutoEventWireup ='true' CodeBehind ='$fileinputname$.aspx.cs' Inherits ='$rootnamespace$.$classname$'%> Save the file and make sure that the zip file gets updated with the saved data (check: Open the Zip file again and edit the file again to make sure).