Question

We use master pages in our web application, the doctype is defined in the master page.

On one of the pages I need to change the doctype, or else a third-party control renders incorrectly.

How can I change the doctype of only that certain page without affecting the rest of the pages?

Answer 1

By far the simplest way is to make another copy of your master page, change the doctype in that and have this page use the new master.

Answer 2

I don t know if it would work but

You can reset the content type with

Response.Clear();
Response.ContentType = "text/html";

Then write your doctype type

Response.Write(<new doc-type>);

But you will also loose all meta headers and such, you re probably better off with the other solution provided by Chris Lively...

Answer 3

Have you used an ASP Literal control?

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<asp:literal runat="server" id="docType"></asp:literal>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">

Then in the Page_Load, you could:

this.docType.Text = {your doctype-string here};

Answer 4

This works too....

protected override void Render(HtmlTextWriter writer)
{
        StringBuilder sb = new StringBuilder("<!DOCTYPE HTML>" + Environment.NewLine);
        HtmlTextWriter textWriter = new HtmlTextWriter(new StringWriter(sb));
        base.Render(textWriter);
        writer.Write(sb.ToString());
    }

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