ASP.NET designer not showing design of page VS2008 - asp.net

I am having a bit of an issue with VS2008 and ASP.NET. I am designing a page that is referencing a masterpage file, but when I go to edit the contents of the page, it does not show up in the design. It only shows my master page file.
This is the only page in my entire project that shows up like this. A few pages are showing like this, but the majority of them that reference the same MasterPage show all the page contents and controls.
Not sure what is going on and I cannot find a common factor between them.

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Visual Studio 2015 not rendering CSS correctly

I'm building an ASP.net web application using Visual Studio 2015.
For the sake of beauty and aesthetics I tried to use a webpage from a ready made website template as a master page (you know those beautiful responsive templates out there!).
The problem is like this:
In the design view the master page and all the pages using it don't show correctly, they appear in chaos.
When testing the design in the browser it shows perfectly well!
What is the reason VS 2015 not able to show the page correctly in the design view?
This is what I tried in pursuit of solving the problem:
I changed the path to the CSS files (placed ../ and ~) without success.
I drag-dropped the CSS files into the source view of the master page in order to enable VS to create the links on its own but also without success.

Report Viewer looks bad with master page?

I am using report viewer control with my web application, if I use it without master page it looks perfect but if i use it inside masterpage, it has lots of formatting and css issues. does anyone knows why?
Because it may some Css files affect the appearance of your reportviewer container ,so try to remove the CSS files one by one from your master page and check the look every time so that u know the exact file which cause your problem,after that you can make a custom style to your report viewer container .

ASP.NET Tabs to Navigate to Existing Pages

I am writting a log viewer application,and i have all the pages already written. (Visualizer,Configuration and a third one).
Is it possible to create a tabbed control or anything like this,that allow me to navigate through those pages without having to paste all the code of all the pages in a single .aspx file ?
How can i make a tabbed control (multiview,i guess,right ?) to navigate to the existing pages?
Once i click a tab,it changes the content of a container above the tabs.
Is it hard to do ?
If i understand your question corrctly, You are probably looking for something like a jquery tabs menu.
option 1 - try the demo and see if it is what you are after
Option 2 - this is the demo

Design Page cannot be viewed!

In Visual Studio 2008, while editing the web page, it is displaying some error and I cannot design my page in design view, I can do only in Source code. It is showing the following error in design view...
Master Page Error
'The Page Contains Markup that is not valid when attached to a master page
Correct the problem in Code View'
Wat is the problem? Whr Should I change ?
Ok, you've got a master page and a content page and when you put the two together you get an error.
If the error isn't obvious you have to work to a point where you can identify what's caused the error - debugging but of pages rather than code.
Create a new page that uses the same master page with no content - does that work? If so then the Master Page is probably not the issue.
Now add the elements in your failing page one at a time to your new page - as close as you can manage to cutting and pasting from one to the next but one change at a time. At some point you should see the error arise in the new page - and at that point you should either be able to fix it or will be able to ask a more specific question about why it doesn't work.
It is the case that designers in VS can just gets themselves tied in knots - but there's usually an underlying cause.
The problem is that your markup in invalid. Fix it.
You likely have an open tag, improperly nested tag, or malformed asp tag.
The problem is that you have edited the source code in such a way that it can no longer be shown in the designer.
Try undoing the latest change that you've made to see if that fixes the problem.
Check too to make sure that you have no <form>, <html>, <body> or <contentplaceholder> tags in your page. These will already be present in the master page, so there's no need for them in the sub-page.
In SharePoint designer, when you insert a MasterPage in customized form, you get this error.
If you remove the < script / > tag,
it works fine for me. Hope that will work for you too.

Master Page Error in Asp.net

When I create a new page in asp.net and try to include the master page, I cannot view the designer part as it shows an error : "Master Page Error".
Although the page runs without any errors, designing the page becomes difficult as I can't see the design. I can only view the source part of the page. This is very difficult for me to design my page properly.
Actually my master page is in another folder. Does it make any problem?
Are you running the code locally or on a server? If on a server, make sure it has the same version of the .Net framework that you are developing on in visual studio.
Another folder is not a problem.
You can try to make a new page and select masterpage on creation.
Probably the code in which you are referring to the master page is somehow corrupt.
Check if that works and if so alter the reference of the page giving the error.
Still giving an error after that, then alter your question with the page source so people can see what's going wrong.
Saw this on another post and it fixed it for me. Its crap and its a total hack, but it worked for me. Remove all # symbols from your master page. Problem is, I NEED these in my markup. It all worked fine in VS2005. Every page that had its own master page worked fine. It gave me the Master Pager Error - fix it in code view error when I opened it in VS2008.
Took out the # symbols and Voila!, went right to design view in VS2008.
If you have comments on your master page and there's a % in one of them, remove the % from your code and try again.
Can you view design view on the master page?
Do you have double nested master pages - these do not work.

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