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How do I regenerate designer File in Visual Studio 2015

I am getting error as
The name does not exist in the current path as in issue link Name does not exist in the current context
I have tried all options in the comments but still unable to find solution,
One comment their says to regenerate designer file by right clicking and selecting "Convert to Web Application" but am already using web application and on right click of it am not getting that option.
Attaching reference Image.
Any suggestions?

I'm a little late to the party here, but I have a solution (and it's as easy as you hoped):
The "Convert To Web Application" menu option was moved to the Project menu item across the top of the Visual Studio 2015 application.
First, delete the desired designer file.
Next, click on the ASPX page of the one you want to regenerate the designer for. If you click on the CS page, the option will not show up in the menu.
Click on Project from the top menus and you should see "Convert To Web Application" in the menu. It should be all the way at the bottom of that popup menu.

How to make .rdlc report with C#/WPF

I want to know how to generate reports in WPF app. I found some tutorial in MSDN. They say that i need to add new reference to
Microsoft.ReportViewer.WinForms, but I don't have such thing on list. I want to design report in Visual Studio and open it with code.

Go to project -> Add -> References. Then in the search bar search for Microsoft.ReportViewer.WinForms. This will allow you to add a report viewer which will display the form you create.

Open Visual Studio Crystal Reports Wizard for created RPT files

I'm using Crystal Reports (v 13.0) Wizard to create some RPT reports.
When I add a new .rpt, VS start with the Wizard. Then when the Wizard procedure ends it generates the .rpt file.
I want to know if it is possible to open again the created .rpt file with the Wizard showing the settings I made before, to be able to change them.
If I double click the .rpt file it opens inside the Report view like this:
I tried with right click on the .rpt and the .cs but I found no options like "Open with Wizard..." or so. Is it possible?

With right click on the report in design mode there are many options in the context menu: Database Expert..., Selection Expert... and so on.

New Blank Page(XAML) projects = Controls are not showing on the MainPage(only their borders are)

I'm new to Visual Studio and couldn't find my answer anywhere else for hours over the internet..
I'm Using "Visual Studio Express 2012 for Windows" and everytime I create a new project with a blank page (XAML), the designer only shows me the frame of the page with its missing background.
And any control I drag to it, is invisible (I can only see the square border of the control I dragged but no texture..)
This is only happening during design time. On RunTime it actually shows up..
This is happening to me since I had the first fresh install. Just to be clear, I am NOT opening an existing previous project.. I have non. This is the first time I make a project in C# and I'm surprised I didn't find anything useful so far over internet search..
Also tried installing, uninstalling, repairing and changing to different versions...
The problem didn't show on Visual Studio 2012 Express for Desktop, but this product doesn't seem to be fit to my needs.. (I'm trying to also learn how to develop for Windows Store and other products)
The IDE doesn't show any errors or warnings..
Help would be much appreciated!
P.S - I'm running Windows 8.1

You can try Blend to open the project and render the xaml，if the problem appear too, maybe you should check out your graphics card or update driver.

try with this!
Check the following:
Tools -> Options
Expand Text Editor -> XAML -> Miscellaneous
Make sure that "Always open documents in full XAML view" is not checked
Or perhaps the default program for opening .xaml files has changed:
Right-click your .xaml file in Solution Explorer
Click Open With...
Select XAML UI Designer
Click Set as Default button
Click OK

If it's related to the video driver, maybe disabling hardware acceleration will help?
Or you could try Visual Studio Community Edition (http://www.visualstudio.com/, click on the Download button under "Free developer tools"
Did one of these suggestions work?

How to create .rdlc files?

I am using Visual Studio 2010 for generating reports using report viewer... As I am totally new to this, I don't know how to create an RDLC file and how to use it... Also, please tell me that what the connection is between Report Viewer and rdlc
Please help me out. Thanks

To add an RDLC report do Project > Add New Item... > Reporting > Report. You can also use the Report Wizard which is on the same screen. RDLC has a large wealth of information you will need to know about, so you will want to start digging into the documentation.

Creating Client Report Definition (.rdlc) Files
Here is the answer http://msdn.microsoft.com/en-us/library/ms252067.aspx
To add a new report to a project
In the Project or Web Site menu, select Add New Item.
In the Add New Item dialog box, in the Installed Templates pane, select Visual Basic or Visual C#.
In the Templates pane, select Report or Report Wizard.
If you select Report, a blank .rdlc file is added to the project. For more information on how to design reports in Report Designer, see Reporting Services Reports in SQL Server Books Online.
If you select Report Wizard, the Report Wizard is started to guide you through the steps in creating a report. For more information on the Report Wizard, see Creating Client Report Definitions Using the Visual Studio Report Wizard.