I have an application that I am working on in Visual Studio 2022 VB.NET. I want to change the startup form from Form1 to frm_Main.
I go to Project >> Project Properties >> Startup Form; but the only form listed in the drop down is Form1 which was created when making the project. I cannot seem to get frm_Main to be an option.
I created frm_Main but going to Project >> Add New Item >> Form (Windows Form); typed in the name and clicked add.
Some light on this would be awesome.
It is a known issue, which will be fixed: https://developercommunity.visualstudio.com/t/10039228.
Related
My vb.net program was functioning properly. After I renamed Form1 in the code pane of Visual Studio 2015 the Program.vb[Design] pane will not open and the following message appears:
The class Form1 can be designed, but is not the first class in the file. Visual Studio requires that designers use the first class in the file. Move the class code so that it is the first class in the file and try loading the designer again.
The name change was in the first class (form) so I cannot move it further up.
Before the change there were no errors. After the change there are many handles clause, variable not declared and not a member of errors.
I had 2 choices for Startup form in the Application tab of My Project before the change. After I have only 1 choice from a dropdown list. Both choices were Class names.
Is there anything I can do to recover the Designer view? Should I just recreate the form?
Thanks in advance, for any suggestions.
I have a vb.net Windows Forms application using Visual Studio 2010. At design time my buttons look like this:
at run time they seem to revert to a Windows classic style:
It only happens for this project which I took over from a developer who left. I want them to look like they do at design time. I'm stumped. Any ideas?
If the app starts from a Sub Main rather than a main form (See Project -> Properties -> StartUp Object) it might be missing this:
Public Sub Main()
' probably missing:
Application.EnableVisualStyles()
Application.Run(New Form1)
End Sub
When starting from a Main sub, be sure that EnableVisualStyles() is invoked very early in the procedure before any UI Objects are created.
If it starts from a main form, go to the same Project properties and be sure that both Enable application framework and Enable XP Visual Styles are checked.
If it still doesnt work, turn on Show All Files in Solution Explorer and open Application.myApp under My Project. Make sure this setting is true:
<EnableVisualStyles>true</EnableVisualStyles>
This file/setting should be managed by VS, so if it is not being updated to match the IDE, you might have other issues.
Okay, in Visual Studio 2012 I have a VB.NET project with originally two forms. Form1 was originally set as the startup form and then obsoleted. Form2 is a nearly identical form that has all of the new desirable functionality.
In my project's settings, Form2 doesn't appear as an available option for Startup Form. (Though it is a normally-created form that inherits Form) After some "troubleshooting," Form1 has been deleted, resulting in the the "Enable Application Framework" option being disabled and no Startup Object being available. When I select anything from the Startup Object drop-down, either Sub Main or Form2, I have an error message stating either "Sub Main not found in Solution" or "Form2 is a type in Solution and cannot be used as an expression" respectively. If I try to enable "Enable Application Framework," I receive an error popup stating "Startup object must be a form when 'Enable application framework' is checked." And Application.Designer.vb is empty.
Some things I've tried:
Clean and Rebuild Solution
Restarting Visual Studio
Temporarily deleting Form1 (it's still excluded from project)
Added a new form, per Neolisk's advice. It appeared in the available objects. I selected it and turned on application framework. From here, I copied the initialization code from Form2's designer code into Form3's. All was alright. Then, I copied Form2's main code into Form3. Now, "Form3 is a type in Solution and cannot be used as an expression" appears in my error list.
With that said, my question is how can I get Visual Studio to recognize my form as a form and set Form2 as the startup object?
add InitializeComponent() in new() function in form2
Found it! The issue was an overload of the form's constructor taking a form as a parameter. Since this was the only constructor in the file, I guess it caused confusion. Commented that out and all was right with the world again.
Sometimes you have a different class name from the form file name.
Check if the class name is listed.
I'm really struggling to find out how to dynamically load a form when starting a VB.NET winforms application in VS2010.
Looking at existing answers such as this: Programmatically change the startup form on application launch?
Has not helped. I do not have a main method (that I can see) in my winforms project and when I go into the project properties I can only select a start-up form. But I have one of two forms to display on start-up depending on the user accessing the application.
I tried to set a loading form up which, in it's load event would call .Show() on the correct loading form after it had determined it and then the loading form would close itself down, but doing this led to both forms being closed.
Below are steps for VS2010 VB.NET Winforms select startup form programmatically.
1 : Go to My project from Solution Explorer
2 : Click on Application Tab--->Uncheck Enable application Framework
3 : Then Inside module create Sub like this
Public Sub Main()
MsgBox("called Main") 'This is testing
Login.Show() 'Set your start up form here
End Sub
4 : Again My Project--->Application Tab--->Startup Object--->Sub Main
5 : Thats it, It will give you message box and will show Login form.
Hope It will help you.
Thanks
Mahesh
Nevermind. I found in the properties a button to generate the MyApplication class in which I can access the startup event.
Another option is to use an MDI form. When it loads you can determine which child form to display.
Using Sub Main is the way I have done this forever but for some reason, MS has decided to make the norm, difficult. To use the Sub Main way, create a "Module" if you dont already have one. Put this code in there:
Sub Main()
Stop
End Sub
Now, in your project properties, assuming your are doing a standard WinForms application, on the "Application" tab, uncheck the "Enable Application Framework". This will allow you to see (and select) "Sub Main" in the "Startup Object" drop-down.
I have a very small VS2008 Winforms project that will not start.
When I attempt to start debugging the project, I get the message:
'<form>' is a type in '<project>' and cannot be used in an expression.
From the file .Designer.vb.
The problem is that is indeed a form. If I create a new WinForm and set the startup object to the new form, I get the same message.
When I attempt to check the "Enable application framework" checkbox in the Project properties, I get the message "Startup object must be a form when 'Enable application framework' is checked.
I've tried creating a new project and moving all the code and designer objects to a new form file in the new project, and same result.
Other projects on the same computer run fine.
Any suggestions?
Thanks!
Turns out that the problem was that I didn't have a New() function with no parameters. This is required for VS to see the class as a form.