Error while compiling asp.NET application - c#

When I compile my asp.net application,I get the below mentioned error.This error occurs often.The language I am using C#.
Internal Compiler Error (0xc0000005 at address 03976102): likely
culprit is 'BEGIN'

I found some information about the error on the Microsoft connect site
An excerpt from the page is as follows :
I believe that this issue has been fixed post-RC. The problem is that
the C# compiler is crashing as it is tries to report an error or
warning. In several cases we have seen the warning being reported is
that the LIB environment variable contains an invalid path. To avoid
the crash, check that your LIB environment variable contains valid
paths.

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XSP/Mono: preventing "Warning as Error" exceptions

I'm running an ASP.NET v4.8 project under Mono.
Actually, I'm doing it by using the Mono's standalone web server - XSP.
When I try to start the application in browser, I'm getting this annoying exception:
System.Web.Compilation.CompilationException:
error CS1685: Warning as Error: The predefined type System.Runtime.CompilerServices.AsyncMethodBuilderAttribute' is defined multiple times. Using definition from mscorlib.dll'"
For each project in my solution, I set the "Treat warnings as errors" option to "None" - but it still doesn't work.
I suspect that the "Warning as Error" exceptions come from the XSP program, but not sure.
I can say that I able to load the application when I'm deleting 2 files - System.Memory.dll and System.Threading.Tasks.Extensions.dll which both are used by npgsql.dll.
But when I try to use Postgres in the application, I'm getting another exception which says that the 2 files are missing...
Since the project works fine on IIS, my question is:
how do I stop those annoying "Warning as Error" exceptions?
Thanks for any answer!

VS2015 C# Localhost ASHX Error (But it works on Server?) HRESULT 0x80131401

I'm building a website in VS2015 (C# using Razor)
I see many posts where people say that they receive this error on their server, but not localhost - my issue is the opposite. I'm seeing this error in every *.ashx file preamble in this specific Website only while running Localhost on my development machine:
ASP.Net runtime error: Loading this assembly would produce a different grant set from other instances (Exception from: HRESULT 0x80131401)
This error prevents me from using Intellisense in the file - and I really need it for this next handler.
What I've Determined: - The issue is specific to this Website. I have other websites that do not produce this error, so there isn't a need to modify registry or change PC configurations.
What I've tried:
IISReset (Restart PC) [*before I realized problem was local]
Changing Registry by adding LoadingOptimizer DWORD [*before I realized problem was local]
Compared XML of a working Web.config file. (Other than assembly differences I played around with other differences and still nothing)
Any suggestions?

error cs0016 could not write to output file needlicense.cshtml access is denied

Installation of ASP.NET application goes through fine. But launching it after installation causes this error in browser.
Compiler Error Message: CS0016: Could not write to output file
'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\
d09d1fc5\8ea09859\App_Web_needlicense.cshtml.639c3968.h6teml6g.dll' -- 'Access is denied.'
I have seen many questions on this error, but this is on a different dll. Fixes provided in similar errors doesnt seem to work for me. Hence, I thought of checking this particular error here.
I am hopeful of finding a perfect answer here. Thanks.

Microsoft.ReportViewer.Webforms "[SerializationException] Member 'ReportServerErrorCode' was not found"

While working on a project to download and attach an Excel render of an SSRS report in a C# project using ReportViewer packages, I encountered the error:
[System.Runtime.Serialization.SerializationException] Member 'ReportServerErrorCode' was not found.
I had encountered it locally and found the fix trivial enough to not write down the solution. Upon deploying the branch to the QA server, I encountered it once more.
The solution is a little complicated. I believe that his error essentially is a one-size-fits all bucket for reporting errors when you don't have the necessary .dlls to get Report Server Error codes. The packages on NuGet have the following .dlls:
Microsoft.ReportViewer.Common
Microsoft.ReportViewer.DataVisualization
Microsoft.ReportViewer.ProcessingObjectModel
Microsoft.ReportViewer.WebForms
In my case this was an error thrown by a dataset. The only way to get to the actual error was to look at the SSRS logs.

Compilation issue ["Root activity type is invalid"] only when compiling from network drive

When i am compiling .net 3.5 project from network drive
following compilation issue occurs.
C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Workflow.Targets(121,5):
error : The root activity type is invalid. Workflow markup
validations completed with 1 errors and 0 warnings.
But if i copy the solution in local drive and build ,it works fine.
What could be the issue? How to resolve this?
The first test is to re-do the compilation using the full path, instead of the network mapping drive:
M:\yourDynamicView\YourVob\...
# instead of
V:\YourVob\...
That will reference the very same view.

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