Developer technologies | Windows Forms

MySQL to C# Connection Error

Login code working slowly

i am using the following code to check login details entered from textboxes but i realize that i have almost 130,000,982 usernames in my database so its kind of slowing the things . can the experts from your side suggest what should be the code to check…

PROBLEMS WITH FTP -PASSIVEPORTRANG

Hello! I have a problem with the FTP protocol. I am transferring files to a domain via the command line. The company that rents the domain changed the operating system from CloudLinux 7 to Cloud Linux 9. And since then the transfer has not worked for me.…

Designer load encountered an error

Designer load encountered an error. Please ensure that the project can be built successfully.

Designer error on load

How to fix "The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: Form1 --- The base class 'System.Void' cannot be designed."

what is the best way to develop a computer service

what is the best to start developing a computer program that will eventually become a windows server. I will like this program to have a windows form during the development.

When I want to add images on the form it always come up with one error- Method "Llabel1_Click" not found

When I want to add images on the form it always come up with one error- Method "Llabel1_Click" not found.

error object reference not set to an instance of an object in vb

Cannot view or edit form. getting an error message 'error object reference not set to an instance of an object' at StreamJsonRpc.JsonRpc.d__156`1.MoveNext()

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…

Designer load encountered an error. Please ensure that the project can be built successfully.

Trying to create a new WinForms project in Microsoft Visual Studio Community 2022 (64-bit) and get this error.

VS 2026 will not show form designer after creating a new VB Windows Forms App targeting .NET 10 Framework

I am trying to create a new Visual Basic Windows Forms App for .NET 10.0 in Visual Studio 18.9.2. Once the new project is created, I cannot get a Form Designer opened. I have found a number of possible solutions to this on the web, but nothing I try has…

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…

Visual Studio Forms Designer: The given key 'reader' was not present in the dictionary.

I get the following error when trying to save a control after changing a property in the Forms Designer: Visual Studio Forms Designer: The given key 'reader' was not present in the dictionary. What causes this error? I have two minimal user controls…

Smart App Control blocks WinForms / WPF sample applications from running

When Smart App Control is enabled on Windows, I am unable to run WinForms or WPF sample applications from Microsoft Visual Studio. After enabling Smart App Control and attempting to run the project, Visual Studio shows the following error. Smart App…

I used to have 3D buttons but not in 2026

I used to use 3D buttons. These had a kind of drop shaddow effect so they would visualy go up and down. What I have now is just a flat button. On a visual basic forum I was told to Right click on project and select properties In application general, I am…

Can I use both "Designer" and "DesignerAttribute" in a Winforms UserControl?

I am trying to create a Winforms UserControl that will act as a container for other controls AND use its own Designer. I have used the following Microsoft examples: ControlDesigner…

"Could not load file or assembly" error in Visual Studio designer.

I am getting a "Could not load file or assembly" error in the Visual Studio designer for a WinForms app, when the file in question (a custom DLL) most definitely exists, and in the directory that it is supposed to be.

Overload resolution failed because no accessible 'Image' is most specific for these arguments

My app has a bunch of buttons. The images on the button were added by importing an image to the Resources. I added a TableAdapter through the DataSet Designer. Now when I go to open the Form Designer it fails to load with this error:The designer cannot…

Sequence contains no elements

I'm using Visual Studio 2026 writing in VBasic. 3 times recently I have received the above error and I don't know what's wrong nor how to fix it. It happens when copying and renaming controls. There's no help, and VS doesn't allow me to do further…

How to fix f:\recovery\windowsre\winre.wim\system32\logfiles\srt\srttrail.txt

Hello, iv tried watching a bunch of videos and looking all over the internet but i just cant figure out what is wrong with it. i think my windows is installed onto my C: but I'm not even completely sure. the error code is:…