Asp.net Build error? - asp.net

when i run the my asp.net application it is showing this message can u help me.
Could not load file or assembly 'System.Web.Extensions.Design, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

You need to check whether referenced assembly (System.Web.Extensions.Design) exists in GAC or Bin folder of your app.

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Microsoft. Office.interop. Excel dll exception

In localhost, it is working properly with dll and its assemblies but when I am hosting my website at that time it is showing me exception " Could not load file or assembly 'office, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified"
Is anyone having solution of this
you juste need to include the bin file générated in the project

Could not load assembly System.Runtime in Xamarin.Forms UWP Project with .NET Standard library

I'm in the process of setting up a Xamarin.Forms app using .NET Standard for the shared library instead of a PCL. I've followed the instructions for doing so laid out here: https://channel9.msdn.com/Shows/XamarinShow/Snack-Pack-15-Upgrading-to-XamarinForms-to-NET-Standard
This is with a brand new Xamarin.Forms app, created using Visual Studio 2017 with a PCL, which was replaced with a .NET Standard library as described in the video.
The UWP app compiles fine, but throws this exception when I try to start it (on the call to Xamarin.Forms.Forms.Init)
System.IO.FileLoadException: 'Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)'
I've tried specifically adding the nuget package for System.Runtime, version 4.1.0 to the UWP project, but that doesn't seem to help. It runs fine in Android, but keeps giving me this exception running the UWP project. Can anyone tell me what might be causing this and how I can fix it?
edit:
there is a very similar error in the build log:
Could not resolve this reference. Could not locate the assembly "System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
Followed by an extremely long list of places it has checked.
I also found this, which seems like it may be the problem:
2> There was a conflict between "System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" and "System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
2> "System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was chosen because it was primary and "System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was not.
Does anyone know how I can resolve this conflict?
edit 2:
There's also this in the build logs right after the above, which is even more perplexing, as it seems to indicate the only thing referencing version 4.0.20.0 of System.Runtime is... version 4.3.0 of System.Runtime???
2> References which depend on "System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [C:\Users\Katie.nuget\packages\system.runtime\4.3.0\ref\netcore50\System.Runtime.dll].
2> C:\Users\Katie.nuget\packages\system.runtime\4.3.0\ref\netcore50\System.Runtime.dll
2> Project file item includes which caused reference "C:\Users\Katie.nuget\packages\system.runtime\4.3.0\ref\netcore50\System.Runtime.dll".
2> C:\Users\Katie.nuget\packages\system.runtime\4.3.0\ref\netcore50\System.Runtime.dll

Error on server - FIle or assembly load issue

I am getting the following error on server-
Could not load file or assembly 'Microsoft.Moles.Framework, Version=0.94.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
The strange thing is it is not consistent. On deploying the bin again the error disappears and reappears randomly again.
The other random error which occurs in similar way:
The requested script resource 'Common.Common.js' requires version 'AjaxControlToolKit, version=4.1.40412.0 culture=neutral, PublicKeyToken=28f01b0e84b6d53e' of the ASP.NET AJAX Framework. To use this resource, make sure that the softwarereferences version
'AjaxControlToolKit, version=4.1.40412.0 culture=neutral, PublicKeyToken=28f01b0e84b6d53e'
Although I do not have any JSS with this name or used in the application.

ASP .NET Web Forms: Could not load file or assembly 'System.Web.WebPages.Deployment, Version=2.0.0.0

I moved my existing ASP .NET web sites and web applications to a new server, and I'm getting the following error:
Could not load file or assembly 'System.Web.WebPages.Deployment,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or
one of its dependencies. The system cannot find the file specified.
I located this assembly on my computer, and copied it to the BIN folder of my web site. It gives a new error:
Could not load file or assembly 'System.Web.WebPages.Deployment,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or
one of its dependencies. The located assembly's manifest definition
does not match the assembly reference. (Exception from HRESULT:
0x80131040)
Does this mean ASP .NET is not properly installed on the server machine? How do I go about fixing this? I also noticed that the assembly is present on my computer somewhere in the Program Files (x86)/Microsoft ASP.NET folder. However, the Program Files (x86)/Microsoft ASP.NET folder does not exist on the server.
Solution: I installed both ASP .NET Web Pages and ASP.NET MVC 4 on the server. This installed the missing assemblies and created the folders that were missing.
The exceptions speak for themselves: Your project has referenced version 2.0.0.0 of this assembly and you have copied version 1.0.0.0
Find the correct version and you'll be OK

ASP.NET WEb.config Referencing an assembly

Hi I have 3 lines of code generated in my Web.config (.net 4.0) project as below
<configSections>
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=5.0.414.0, Culture=neutral,PublicKeyToken=31bf3856ad364e35" requirePermission="false" />
</configSections>
When I run the project I get the error
: Could not load file or assembly 'Microsoft.Practices.EnterpriseLibrary.Data, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
However I am referencing that assembly Microsoft.Practices.EnterpriseLibrary.Data from a private folder where it may not have a strong name etc in the project(I do Add references,Browse to private folder and add the Microsoft.Practices.EnterpriseLibrary.Data
library).
I hope I can find the added library somewhere in project configuration(No idea where - I searched properties etc. So I can substitute that value without strong name etc in Web.config and get going. Can somebody give a hand ?
thanks
Open a new project and try adding the references via NuGet and compare your config entries.
You just have the wrong version of the assembly referenced.
I found there was a problem in my connect string . I was having a connection for SQL Server Compact and I did not have the providename. This was leading to problems.

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