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How to use DateTime in LINQ when it's NULL

create table mytable (Birth datetime null) public class myModel { public Datetime Birth { get; set; } } var query = from aa in mydb.mytable select new cmyModel { Birth = aa.Birth } I get a message: Nullable object must have a value; If I make the data…

Developer technologies | .NET | Entity Framework Core
asked 2026-11-13T02:27:18.8333333+00:00
Corey Fleig 615 Reputation points
commented 2026-11-13T17:45:19.8466667+00:00
Corey Fleig 615 Reputation points
1 answer

how to fix The service System.Windows.Forms.Design.IEventHandlerService already exists in the service container. Parameter name: serviceType

How do I identify the source of the error The service System.Windows.Forms.Design.IEventHandlerService already exists in the service container. Parameter name: serviceType -------- The service System.Windows.Forms.Design.IEventHandlerService…

Developer technologies | Windows Forms
asked 2026-11-13T17:19:37.3+00:00
Mike Johnson 0 Reputation points
answered 2026-11-13T17:20:35.5166667+00:00

AI answer

1 answer

.NET Framework 3.5 offline install for Win 10 1809 (OS build 17763.107) Enterprise LTSC

Screenshot 2026-11-13 105647.png Hi, I need to install .NET Framework 3.5 on OFFLINE PC with Win 10 1809 (OS build 17763.107) Enterprise LTSC. Unfortunately I don't have ISO image file for this windows version, and also I can't find download link…

Developer technologies | .NET | Other
Developer technologies | .NET | Other

Microsoft Technologies based on the .NET software framework. Miscellaneous topics that do not fit into specific categories.

4,107 questions
asked 2026-11-13T17:03:30.51+00:00
Kurniawan, Yuhendri 0 Reputation points
answered 2026-11-13T17:04:31.72+00:00

AI answer

6 answers

VS 2022 Windows 11 ARM64 EF Diagram failes missing GraphObject DLL

I updated my machine to a MAC Studio M1 and am running parallels with Windows 11 ARM. I am using Visual Studio 2022. On the new machine everything works BUT in the DAO/EF class the EDMX won't load the diagram. Error says…

Windows for business | Windows Client for IT Pros | User experience | Other
Developer technologies | .NET | Other
Developer technologies | .NET | Other

Microsoft Technologies based on the .NET software framework. Miscellaneous topics that do not fit into specific categories.

4,107 questions
Developer technologies | Visual Studio | Other
Developer technologies | Visual Studio | Other

A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.

5,845 questions
asked 2022-12-21T20:50:33.62+00:00
Larry Axon 36 Reputation points
commented 2026-11-13T16:16:27.7+00:00
Larry Axon 0 Reputation points
0 answers

VisualStudio.vsman size / SHA-256 mismatch across supported channels request authoritative validation procedure

We are preparing a reproducible Windows AMD64 build-toolchain acquisition. Before downloading or running compiler/install packages, we compare each catalogue’s downloaded bytes with the size and SHA-256 advertised in its official channel manifest. On 13…

Developer technologies | Visual Studio | Setup
asked 2026-11-13T15:47:22.34+00:00
HarikrishnaRavindran-2428 0 Reputation points
6 answers

ASP.NET Core .NET 8 receives null form values from certain iPhone 13 Pro Max devices

I am troubleshooting a device-specific issue with multipart form data submission in my ASP.NET Core .NET 8 application. Application details The frontend uses vanilla JavaScript fetch with the FormData API to submit customer information and uploaded…

Developer technologies | ASP.NET Core | Other
asked 2026-10-29T09:15:57.76+00:00
Ibrahim Akuetiemhe 0 Reputation points
commented 2026-11-13T13:24:30.3566667+00:00
Ibrahim Akuetiemhe 0 Reputation points
2 answers

.NET 10 documentation for SerializeToUtf8Bytes

Could you point me to an official reference that establishes what applies to .NET 10 for the System.Text.Json.JsonSerializer.SerializeToUtf8Bytes<TValue>(TValue, JsonSerializerOptions) overload? The specific statement I’d like to verify is that…

Developer technologies | .NET | .NET Runtime
Developer technologies | .NET | .NET Runtime

.NET: Microsoft Technologies based on the .NET software framework. Runtime: An environment required to run apps that aren't compiled to machine language.

1,329 questions
asked 2026-11-12T18:20:52.41+00:00
Manica Moscon Advogados 5 Reputation points
answered 2026-11-13T09:20:39.6066667+00:00
Nguyen Dam (WICLOUD CORPORATION) 1,420 Reputation points Microsoft External Staff Moderator
2 answers

Learning courses or books for "building .NET MAUI Blazor Hybirdand web app"

I want to create a new project using this visual studio template:- but i am having troubles finding online courses, books or online documentation targeting this specific template? any advice and help in my learning journey ? Thanks

Developer technologies | .NET | .NET Multi-platform App UI
asked 2026-11-12T23:41:33.6966667+00:00
john john Pter 1,590 Reputation points
edited an answer 2026-11-13T08:47:01.51+00:00
Harry Nguyen (WICLOUD CORPORATION) 690 Reputation points Microsoft External Staff Moderator
1 answer

Visual Studio Build Tools 2022 17.14.45: VisualStudio.vsman size and SHA-256 mismatch

Product: Visual Studio Build Tools 2022 Version: 17.14.45 (build 17.14.37906.3) Channel: Current Affected catalog: VisualStudio.vsman I am attempting to independently verify the integrity of the official Microsoft distribution before installation. The…

Developer technologies | Visual Studio | Setup
asked 2026-11-13T07:09:12.5033333+00:00
Abi Rahmoo 0 Reputation points
answered 2026-11-13T08:11:25.38+00:00
Brian Pham (WICLOUD CORPORATION) 1,425 Reputation points Microsoft External Staff Moderator
1 answer

Microsoft Graph - Not able to assign manager to a user

Hi, Im having issues when trying to assign a user as a manger to a another user. Here is my solution: private async Task<GraphResponse> UpdateUserWithManagerAsync(GraphServiceClient client, AdUser user, AdUser manager) { …

Microsoft Security | Microsoft Graph
Developer technologies | C#
Developer technologies | C#

An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.

11,580 questions
asked 2022-07-06T05:55:28.387+00:00
Dennis Wetterlund 11 Reputation points
edited an answer 2026-11-13T05:07:45.61+00:00
Dennis Wetterlund 11 Reputation points
2 answers

Login failed for User

I get "Login failed for User" error in visual basic connection to sql-server. This error occurs when I move my database from one PC to another. I solve this problem by using same "PC-name" & "User-Name" of my old PC…

Developer technologies | VB
Developer technologies | VB

An object-oriented programming language developed by Microsoft that can be used in .NET.

2,914 questions
SQL Server | Other
SQL Server | Other

Additional SQL Server features and topics not covered by specific categories

14,660 questions
asked 2022-06-27T17:45:45.307+00:00
Habib ur Rehman 41 Reputation points
edited an answer 2026-11-13T05:06:57.2033333+00:00
Habib ur Rehman 41 Reputation points
0 answers

Combo box does not update

Hello I am building a wpf app, using MVVM (I already imported MVVM.Helpers) I am trying to fill a list with 5000 numbers, and put in in a commbo box, and for some reason is not working my app: https://github.com/eduardoagr/RsidentsManager …

Developer technologies | Windows Presentation Foundation
Developer technologies | XAML
Developer technologies | XAML

A language based on Extensible Markup Language (XML) that enables developers to specify a hierarchy of objects with a set of properties and logic.

879 questions
asked 2022-06-22T19:30:58.93+00:00
Eduardo Gomez 4,276 Reputation points
2 answers

Does Dotnet Net 6 Arm64 work on M1 Silicon ?

When I tried using Scaffold Dbcontext, it show there is no such a word as " scaffold dbcontext". Then I uninstalled Net 6 and installed Arm64 version on m y M1 silicon. Guess what ? It didn't work because when checked botnet version, it…

Developer technologies | .NET | .NET Runtime
Developer technologies | .NET | .NET Runtime

.NET: Microsoft Technologies based on the .NET software framework. Runtime: An environment required to run apps that aren't compiled to machine language.

1,329 questions
Developer technologies | ASP.NET Core | Other
asked 2022-05-21T23:29:15.087+00:00
Ozzy Ozmen Celik 21 Reputation points
edited an answer 2026-11-13T05:03:24.11+00:00
Ozzy Ozmen Celik 21 Reputation points
1 answer

JWT Token Expiration and Authorization

I am working with a JWT in .Net Core 6.0 Web Api. I am struggling with JWT expiration time...not sure if it is being set correctly with the UTC being different from my loacl time. But I also am having an issue with not being able to run an API Method…

Developer technologies | .NET | Entity Framework Core
Microsoft Security | Microsoft Identity Manager
Developer technologies | ASP.NET Core | Other
asked 2022-05-11T17:15:23.547+00:00
Ronald Rex 1,651 Reputation points
edited an answer 2026-11-13T05:02:34.64+00:00
Ronald Rex 1,651 Reputation points
2 answers

How do I convert a UWP application to use Azure Maps?

I maintain a large UWP application that uses MapControl (from Windows.UI.Xaml.Controls.Maps). I didn't know that Bing map tokens were being retired until I started seeing a "MapServiceToken not specified" warning in my map views a few days…

Developer technologies | Universal Windows Platform (UWP)
asked 2025-07-09T20:59:00.2433333+00:00
Frank LaRosa 1 Reputation point
edited an answer 2026-11-13T05:00:06.69+00:00
Frank LaRosa 1 Reputation point
0 answers

Working with Dotnet and Sql edge on M1 mac nuget packages

Hello, Im new to mac, I have an M1 mac mini, Im using Visual Studio for M1 mac as well Recently I have Installed docker with sql edge container in it. In order to make my Web API projects more efficient, I couldn't figure it out if I need some…

SQL Server on Azure Virtual Machines
Developer technologies | .NET | Other
Developer technologies | .NET | Other

Microsoft Technologies based on the .NET software framework. Miscellaneous topics that do not fit into specific categories.

4,107 questions
Developer technologies | C#
Developer technologies | C#

An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.

11,580 questions
Developer technologies | ASP.NET Core | ASP.NET API
asked 2022-04-25T21:04:30.397+00:00
Moshiko_Az 1 Reputation point
0 answers

WebApi - ApiKey plus JWT

I completed a couple of projects that are implemented in C# .Net 6.0 MVC, and now I'm trying to do my first web API project. This WebApi is implemented in .Net 6.0, with JWT authorization. Everything is working smoothly so far, the token is generated…

Developer technologies | ASP.NET Core | Other
Developer technologies | ASP.NET Core | ASP.NET API
asked 2022-04-24T23:18:04.233+00:00
Maryan 6 Reputation points
0 answers

Connect .Net project to a website

Hi everyone, I want to login to a website (any website with a login screen) but instead of typing my credentials into a website's login text fields, I want my C# code to do it for me automatically. The issue is that I don't know how to connect my…

Developer technologies | C#
Developer technologies | C#

An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.

11,580 questions
asked 2022-04-12T00:16:28.663+00:00
Nicholas Nguyen 1 Reputation point
3 answers

Use of IS_MEMBER function with multiple databases

Hi, I'm having the following problem cenario: 1 -StoreProcedure A in database A calls Function B from Database B 2- Function B: Return IS_MEMBER('ROLE') 3- the current user is a member of 'ROLE' on database B and not a member on Database A …

Developer technologies | Transact-SQL
Developer technologies | Transact-SQL

A Microsoft extension to the ANSI SQL language that includes procedural programming, local variables, and various support functions.

4,702 questions
asked 2022-04-06T13:05:48.13+00:00
Luciano Pinto 1 Reputation point
edited an answer 2026-11-13T04:57:40.79+00:00
Luciano Pinto 1 Reputation point
1 answer

How do I create a view using existing tables from another database just like using dblinks?

Hi experts, Would like to kindly ask for help with creating a view using a query that selects from tables from another database in the same server. Thanks!

Developer technologies | Transact-SQL
Developer technologies | Transact-SQL

A Microsoft extension to the ANSI SQL language that includes procedural programming, local variables, and various support functions.

4,702 questions
SQL Server | Other
SQL Server | Other

Additional SQL Server features and topics not covered by specific categories

14,660 questions
asked 2022-03-25T06:54:08.513+00:00
SomebodyHelpMePlease 26 Reputation points
edited an answer 2026-11-13T04:54:27.07+00:00
SomebodyHelpMePlease 26 Reputation points