55,992 questions with Developer technologies-related tags

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Exception has occurred: CLR/System.NullReferenceException due to DashboardTabbedPageHandler

My home page is a flyout page with a tabbed page as the detail and a menu pop up page as the flyout. My problem is I have a handler for tabbed page and while using it I am getting below exception: Exception has occurred:…

Developer technologies | .NET | .NET Multi-platform App UI
asked 2026-06-17T12:56:06.0433333+00:00
Sreenivasan, Sreejith 865 Reputation points
commented 2026-06-17T16:47:40.3966667+00:00
Viorel 127K Reputation points
2 answers

Can't Sign in to Unlock or renew License for Visual Studio Community 2019

When I open Visual Studio Community 2019, it tells me: License: 30 day trial (for evaluation purposes only) Your evaluation period has ended. Please sign in to unlock the product. Check for an updated license We could not download a…

Developer technologies | Visual Studio | Setup
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.

5,772 questions
asked 2020-12-10T08:43:43.113+00:00
Mike w 1 Reputation point
commented 2026-06-17T16:03:39.79+00:00
Amarjit Singh 0 Reputation points
6 answers

how to fix StreamJsonRpc.ConnectionLostException : The JSON-RPC connection with the remote party was lost before the request could complete. ---> System.OperationCanceledException : The operation was canceled.

even upgrade to the latest Version 17.6.4 still does it, can even be idle when it happens, Super annoying. StreamJsonRpc.ConnectionLostException : The JSON-RPC connection with the remote party was lost before the request could complete. --->…

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.

5,772 questions
asked 2023-07-10T23:08:22.1866667+00:00
Starfall Conquer 30 Reputation points
commented 2026-06-17T15:23:40.1266667+00:00
Rob Saddler 0 Reputation points
2 answers

iText 9 Errors

Hello everyone and thanks for the help in advance. I am working on a .Net 10 MVC project that utilize iText 9 to generate Pdf files. The code looks like this: string webRootPath = _webHostEnvironment.WebRootPath; string src =…

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.

4,168 questions
asked 2026-06-11T19:56:26.0466667+00:00
Kmcnet 1,376 Reputation points
commented 2026-06-17T10:41:23.3766667+00:00
Tom Tran (WICLOUD CORPORATION) 5,050 Reputation points Microsoft External Staff Moderator
2 answers

error in my design

Could not find type 'DVLD.ctrPersonInformation'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built using settings for your…

Developer technologies | Windows Forms
asked 2026-06-12T08:27:58.93+00:00
Raneem kamel 0 Reputation points
commented 2026-06-17T09:10:59.4766667+00:00
Danny Nguyen (WICLOUD CORPORATION) 7,185 Reputation points Microsoft External Staff Moderator
4 answers

Changing DataDirectory does not load different data

When the user clicks File | Open, the user gets a FolderBrowserDialog to select a folder containing the MyData.mdf data file. After clicking OK, the app calls AppDomain.CurrentDomain.SetData("DataDirectory",…

Developer technologies | VB
Developer technologies | VB

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

2,928 questions
asked 2026-06-17T04:33:17.3833333+00:00
James Buss 136 Reputation points
answered 2026-06-17T09:03:39.4333333+00:00
Nancy Vo (WICLOUD CORPORATION) 5,785 Reputation points Microsoft External Staff Moderator
2 answers One of the answers was accepted by the question author.

QuestPDF issue

Hi, Can you help for the issues below? I did the change to add "Type" but still the same problem.

Developer technologies | .NET | .NET Multi-platform App UI
asked 2026-06-17T05:27:33.4066667+00:00
Jonathan 210 Reputation points
answered 2026-06-17T08:30:38.1066667+00:00
Nancy Vo (WICLOUD CORPORATION) 5,785 Reputation points Microsoft External Staff Moderator
3 answers One of the answers was accepted by the question author.

Error to "dotnet add package Xam.iTextSharpLGPL"

Hi, Can you help to the errors when running "dotnet add package Xam.iTextSharpLGPL"?

Developer technologies | ASP.NET Core | Other
asked 2026-06-06T15:29:03.71+00:00
Jonathan 210 Reputation points
accepted 2026-06-17T07:47:53.2266667+00:00
Jonathan 210 Reputation points
2 answers

Why does WPF allocate ~80 MB of managed memory when I hover over a DataGrid row, and how can I prevent it?

I have a WPF application (.NET 8.0) with a DataGrid bound to a collection of 50,000 objects. Each object has ~20 properties, mostly strings and decimals. The grid uses default styling with row highlighting on mouse hover. I noticed in the Visual Studio…

Developer technologies | Windows Presentation Foundation
asked 2026-06-17T02:52:23.9633333+00:00
Миров Сергей 0 Reputation points
answered 2026-06-17T07:04:16.7733333+00:00
Nancy Vo (WICLOUD CORPORATION) 5,785 Reputation points Microsoft External Staff Moderator
2 answers

VS 2022 can't build any projects

VS 2022 can't build any projects, it may relate with installed the gitHub Copilot and removed it. I reinstalled the vs2022 and clean the catch. the build is working well from Developer Command Prompt.

Developer technologies | Visual Studio | Setup
asked 2026-06-12T13:38:28.3333333+00:00
David Wei 0 Reputation points
commented 2026-06-17T07:02:14.1633333+00:00
Lizzy Dinh (WICLOUD CORPORATION) 620 Reputation points Microsoft External Staff Moderator
1 answer

How to test automatic download of PSA

I need to check the automatic download of beta print support app from MS store when i connect a printer with beta printer extension inf.

Developer technologies | Universal Windows Platform (UWP)
asked 2026-06-10T10:10:55.96+00:00
Ambigavathi Dhanapal 5 Reputation points
commented 2026-06-17T06:12:38.78+00:00
Ambigavathi Dhanapal 5 Reputation points
2 answers One of the answers was accepted by the question author.

resource attr/colorPrimary (aka com.companyname.handlepdfmauiapp1:attr/colorPrimary) not found.

Hi, How to resolve it? I got the issue even if I've rebuilt it.

Developer technologies | .NET | .NET Multi-platform App UI
asked 2026-06-12T09:11:30.32+00:00
Jonathan 210 Reputation points
commented 2026-06-17T05:28:23.1966667+00:00
Jonathan 210 Reputation points
2 answers

Version mismatch for retail realm package

New update by retail realm provided a package that is targeting to .net6.0 framework but my application run on net standard framework 2.0 . Does RR supports is multi targeted frameworks and or are you able to provide RR that is compatible with .NET…

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.

1,327 questions
asked 2026-06-16T17:57:46.9433333+00:00
Tiwana, Ramandeep 0 Reputation points
answered 2026-06-17T04:19:27.02+00:00
Damien Pham (WICLOUD CORPORATION) 1,755 Reputation points Microsoft External Staff Moderator
2 answers

Visual Studio and Visual Basic

Hi.  I would like to write Visual Basic programs in Visual Studio.   I have read documentation on .NET, Visual Basic and Visual Studio.  I am confused.   Questions?  What is the relationship between Visual Basic and Visual Studio?  When the free,…

Developer technologies | Visual Studio | Setup
asked 2026-06-15T12:23:07.75+00:00
DPA 5 Reputation points
commented 2026-06-17T02:07:59.7266667+00:00
Leon Tran (WICLOUD CORPORATION) 1,990 Reputation points Microsoft External Staff Moderator
3 answers

Visual Studio Product Key is not working

I purchased a Visual Studio Professional Subscription for $1200. I received the Order Details via email and everything so I know it was purchased. I entered the product key that was given to me through the email in Visual Studio 2022 and it says that the…

Developer technologies | Visual Studio | Setup
asked 2026-06-12T11:35:34.66+00:00
Luci Davidson 0 Reputation points
commented 2026-06-17T00:28:07.1233333+00:00
Leon Tran (WICLOUD CORPORATION) 1,990 Reputation points Microsoft External Staff Moderator
0 answers

Visual Studio 2022 cannot import Apple .p12 certificate (password prompt then nothing happens)

Hi, I’m building iOS apps with Visual Studio 2022 (Xamarin/MAUI). I’m trying to use a manually created Apple developer certificate (exported as a .p12 from macOS Keychain) and share it with the team. Problem: In Visual Studio → Apple Accounts → View…

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.

5,772 questions
asked 2026-02-11T15:19:31.56+00:00
Ertan 5 Reputation points
commented 2026-06-16T23:02:41.3266667+00:00
makkankosapo z 0 Reputation points
0 answers

Visual Studio

Using visual studio. Created a ZCash Layer 2 Blockchain, an Ethereum Layer 2 Blockchain, Crypto Math Web-based game, Chess web-based game, and Cris Cyborg Boxing (2D video game for PC Windows). I need technical support to get them live online

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.

5,772 questions
asked 2026-06-08T15:53:40.6566667+00:00
Jeff Campbell 0 Reputation points
commented 2026-06-16T18:32:04.5666667+00:00
Richard Wright 0 Reputation points
2 answers

C++ Line numbers

How does one get line numbers on visual studio, C++ output? with error reporting

Developer technologies | Visual Studio | Debugging
asked 2026-06-12T13:44:05.65+00:00
Sid Kraft 46 Reputation points
commented 2026-06-16T15:24:09.39+00:00
Gade Harika (INFOSYS LIMITED) 2,850 Reputation points Microsoft External Staff
5 answers

The retirement announcement for all Dotnet8

The retirement announcement for all Dotnet versions, ASP.Net Core, DotNet8 isolated and Dotnet8 LTS

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.

1,327 questions
asked 2026-06-11T12:14:42.27+00:00
Muthusamy, Reegan 40 Reputation points
edited a comment 2026-06-16T14:12:02.6+00:00
Bruce (SqlWork.com) 84,086 Reputation points
3 answers One of the answers was accepted by the question author.

A Minimal API endpoint works using Bruno, but doesn't work from a Blazor app

I wrote a Minimal API project using .NET 9. It has several endpoints, which all work from a Blazor application (.NET 9) I also wrote, except for one. The endpoint that doesn't work is meant to delete a user. There are 2 endpoints which get called, one is…

Developer technologies | .NET | Blazor
Developer technologies | .NET | Blazor

A free and open-source web framework that enables developers to create web apps using C# and HTML, developed by Microsoft.

1,701 questions
asked 2026-06-15T19:12:21.76+00:00
Falanga, Rod, DOH 1,020 Reputation points
accepted 2026-06-16T13:52:41.7166667+00:00
Falanga, Rod, DOH 1,020 Reputation points