1,977 questions with Developer technologies | Windows Forms tags

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How to build an install package without Visual Studio?

Hello! I created a Windows Form Desktop app with Visual Studio. Normally, I just copy the EXE file to the target machine and it Just Works; however, it is not working in one particular case. I know that it is most like l missing a dependence. Typical fix…

Developer technologies | Windows Forms
asked 2026-04-17T22:38:03.3966667+00:00
Saga 461 Reputation points
commented 2026-04-18T08:24:48.3766667+00:00
RLWA32 52,366 Reputation points
1 answer

wich nugets I have to install for report viewer in visual studio vb.net?

I just install visual studio and I want to make reports y download Microsoft RDLC Report Designer and Repor Viewer core winforms, but When i want to drag a tool Report Vierer to a form Iit can be place in the form

Developer technologies | Windows Forms
asked 2026-04-17T22:37:37.35+00:00
jose de jesus sanchez 0 Reputation points
answered 2026-04-17T22:37:45.7266667+00:00
Q&A Assist
1 answer

how to fix error on windows form if theres no link to show me where i must fix or adjust my code

how to fix error on windows form if theres no link to show me where i must fix or adjust my codev

Developer technologies | Windows Forms
asked 2026-04-17T20:40:45.69+00:00
A Nodali (25007422) 0 Reputation points
answered 2026-04-17T20:40:58.6666667+00:00
Q&A Assist
5 answers

Windows Forms Application Icon suddenly shows as default icon or does not update color after KB5051989 update

Hi, Our C# Windows Forms Application icon (in the taskbar) suddenly shows as default icon or sometimes doesn't update its color (based on the customization) after installing the KB5051989 update. This has been working for 15 years, and the issue just…

Developer technologies | Windows Forms
asked 2025-03-06T08:36:12.63+00:00
Emmanuel Guballa 25 Reputation points
answered 2026-04-17T19:19:31.16+00:00
Dániel Kékesi 0 Reputation points
2 answers

Can I legally modify the method if there is a text which indicates to not modify it, in Windows Forms App?

Hello, When I create Windows Forms App project, and I add a button into the form, in the Form1.Designer.cs there is a text /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the…

Developer technologies | Windows Forms
asked 2026-03-27T16:00:33.0966667+00:00
Rustam Balushka 0 Reputation points
commented 2026-04-03T10:49:06.64+00:00
Jack Dang (WICLOUD CORPORATION) 16,595 Reputation points Microsoft External Staff Moderator
1 answer

WinForm in Visual Studio 2026 - changing name of a control causes designer to fail

Just migrated to VS 2026. When creating a new form, there is no issues and controls can be added fine. However, when you change the name of a control, the designer throws a wobbly as not all references are renamed in the designer code. I need to…

Developer technologies | Windows Forms
asked 2025-11-13T11:26:52.5733333+00:00
Lowe,Ivan 5 Reputation points
edited a comment 2026-04-02T08:49:43.03+00:00
Lowe,Ivan 5 Reputation points
3 answers One of the answers was accepted by the question author.

what is button in winform is that in win32?

is that button in winform is equal to button in win32? maybe not I use SendMessage in winform to send SETTEXT message to the handle of the button but the text is not changed.

Developer technologies | Windows Forms
asked 2026-03-20T07:23:35.7966667+00:00
mc 6,861 Reputation points
commented 2026-03-23T07:35:49.96+00:00
Taki Ly (WICLOUD CORPORATION) 690 Reputation points Microsoft External Staff Moderator
3 answers One of the answers was accepted by the question author.

how to load 3d in winform?

I want to ask that how to load 3d in winform. can I only load one 3d in one control? So I can click it.

Developer technologies | Windows Forms
asked 2026-03-19T13:02:11.7633333+00:00
mc 6,861 Reputation points
accepted 2026-03-23T04:05:08.62+00:00
mc 6,861 Reputation points
1 answer One of the answers was accepted by the question author.

The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine

I am having Windows 64 Bit os build 19043.1826 21H1, i have office 21 64 bit on this pc, but when i want to open an xls file i am getting the above error, if i build application 32bit it open file correctly, but if i make it 64 bit i can not install…

Developer technologies | Windows Forms
asked 2022-07-25T18:21:25.197+00:00
Sushil Agarwal 406 Reputation points
commented 2026-03-17T08:12:20.3466667+00:00
Thakur Manjeet Singh 0 Reputation points
2 answers

Error for Designer Form on VS

--------Instances of this error (1)--------Instances of this error (1)1.Hide Call Stack1.Hide Call Stackat System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager) at…

Developer technologies | Windows Forms
asked 2026-03-07T22:05:06.6166667+00:00
Hostal, John Joseph 0 Reputation points
commented 2026-03-16T09:33:45.12+00:00
Tom Tran (WICLOUD CORPORATION) 4,765 Reputation points Microsoft External Staff Moderator
2 answers One of the answers was accepted by the question author.

visual studio community new forms project cannot open designer

When I create a new windows forms project the designer cannot open.

Developer technologies | Windows Forms
asked 2026-02-28T17:33:52.3033333+00:00
Robert Wirtz 20 Reputation points
accepted 2026-02-28T17:39:13.4233333+00:00
Robert Wirtz 20 Reputation points
8 answers

Windows Forms Designer Problem When Renaming New Form Before Adding Controls

Note: I have reported the problem below in Visual Studio 2022 Feedback. Just wanted to see if any of you have a suggestion. Normally, when you create a new Form in Windows Forms and add controls to the form, the Designer automatically fills in the…

Developer technologies | Windows Forms
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.

5,736 questions
asked 2022-09-14T20:22:54.647+00:00
Nicholas Piazza 546 Reputation points
answered 2026-01-29T21:16:34.46+00:00
Dustin Scholl 0 Reputation points
3 answers

using Visual Studio community, how do I create awindows desktop visual basic startup object main

I have many VB applications written in Visual Basic, from 2006 to 1019, using .NET 4.8 framework. I want to upgrade to .NET 10.0 in Studio 2026. The compiler signals differences between .Net framework and .NET core, which / can resolve. But: some…

Developer technologies | Windows Forms
asked 2026-01-27T10:31:42.9833333+00:00
Martin 0 Reputation points
recommended 2026-01-28T03:07:22.64+00:00
Harry Vo (WICLOUD CORPORATION) 4,750 Reputation points Microsoft External Staff Moderator
1 answer

Issue opening file using WinForms application (Open file dialog) where file location is OneDrive

Hi, I am seeing an issue with File Open Dialog when I try to open a file from OneDrive location mapped on my machine. Issue / Steps to reproduce: Copy any file (ex: excel file) to OneDrive Double click and open the file from OneDrive location to…

Developer technologies | Windows Forms
asked 2021-10-12T10:52:54.273+00:00
Eswar Chaitanya Darsi 1 Reputation point
edited an answer 2026-01-21T21:29:14.51+00:00
Eric Brenner 0 Reputation points
0 answers

Digital signature exe, slow startup

After I used the certificate to digitally sign my client program, it took me 20 seconds from double clicking the program to start to running to the first line of the main function. If I don't sign, I can immediately open the client. What is the reason…

Developer technologies | Windows Forms
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.

4,174 questions
asked 2024-07-26T09:29:41.7666667+00:00
Chaip 5 Reputation points
answered 2026-01-21T18:15:29.92+00:00
switzerland 26 Reputation points
6 answers

Recommend a free PDF developer's library for C#

I'm using VS 2017 CE, C#, and WinForms on a non-commercial application that adds and deletes pages from PDFs. The added pages are created with minimal text and no drawing or graphics. I've been using iText7, and it's great, but it has far more power…

Developer technologies | Windows Forms
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.

11,794 questions
asked 2020-12-25T19:45:22.387+00:00
Anonymous
answered 2026-01-17T05:50:08.5766667+00:00
Anna Tarta 0 Reputation points
1 answer

Make WinForms look like and behave the same as WinUI 3

Hello everyone, I would like to know how to make Windows Forms (WinForms) look like and behave the same as WinUI 3. Thank you very much.

Developer technologies | Windows Forms
asked 2026-01-14T14:31:47.31+00:00
Tommer Francis 0 Reputation points
answered 2026-01-14T15:33:22.3433333+00:00
Castorix31 91,866 Reputation points
2 answers

Re-built a winforms app from .net framework 4.7.2 to core 6.0 now questioning where to go next.

So at work, we had a internal application that has been part of our key processes for the last 10 or so years and hasnt really received any big updates. The past two months I was given access to the source code and have pretty much started learning C#…

Developer technologies | Windows Forms
asked 2026-01-12T16:07:11.3966667+00:00
Steven Brewer 0 Reputation points
answered 2026-01-12T17:24:33.1766667+00:00
Bruce (SqlWork.com) 83,741 Reputation points
1 answer One of the answers was accepted by the question author.

How do I have 1 extender showing Countries and a Second with Cities in Panel.?

Hello, I am using AJAX Complete Extender. There is a drop down list with 2 items USA or EUROPE If User selects Europe, then a Panel opens for Europe with textbox. That is bound to SQL table of EU Countries x (42) They start typing the Country name and…

Developer technologies | Windows Forms
asked 2026-01-09T01:06:45.64+00:00
Matt Matt 170 Reputation points
commented 2026-01-11T09:25:04.4466667+00:00
clemmi joules 0 Reputation points
3 answers

How to sign ClickOnce artifacts when using Google Cloud KMS for code signing?

I've successfully done code signing using Google Cloud KMS and jsign for executable files, but I'm unable to sign ClickOnce manifest files. Current Setup Certificate: Code signing certificate from Sectigo (in .crt format) Private Key: Stored in Google…

Developer technologies | Windows Forms
asked 2025-07-24T16:36:09.0733333+00:00
Darshana Dilhan 0 Reputation points
answered 2026-01-09T17:25:22.4566667+00:00
Darshana Dilhan 0 Reputation points