I inherit from a root form that has a next and back button in,

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Asked: May 13, 20262026-05-13T12:08:40+00:00 2026-05-13T12:08:40+00:00

I inherit from a root form that has a next and back button in,

0

I inherit from a root form that has a next and back button in, then use these buttons on some subforms and get the buttons called twice, i beleive the problem to be outlined in the MSDN here:
http://msdn.microsoft.com/en-us/library/e33683a5(VS.71).aspx

how would i apply the advice they give to C# rather than VB?

It is causing lots of problems having all my buttons called twice, thanks.

Code:

Root Form

public partial class rootForm : Form
    {
        public rootForm()
        {
            InitializeComponent();
        }

        private void rootForm_Load(object sender, EventArgs e)
        {
            //used for all generic strings e.g. buttons
            this.Text = Resources.UIStrings.FormTitle.ToString();
            this.btnNext.Text = Resources.UIStrings.btnNext.ToString();
            this.btnBack.Text = Resources.UIStrings.btnBack.ToString();
        }

From designer:

        // btnNext
        // 
        this.btnNext.DialogResult = System.Windows.Forms.DialogResult.Cancel;
        resources.ApplyResources(this.btnNext, "btnNext");
        this.btnNext.Name = "btnNext";
        this.btnNext.UseVisualStyleBackColor = true;

Install Form

from designer

        // 
        // btnNext
        // 
        this.btnNext.Location = new System.Drawing.Point(373, 360);
        this.btnNext.Size = new System.Drawing.Size(99, 23);
        this.btnNext.TabIndex = 7;
        this.btnNext.Text = "Install";
        this.btnNext.Click += new System.EventHandler(this.installButton_Click);

From Form:

    private void installButton_Click(object sender, EventArgs e)
    {
     doSomeStuff();
    }

Call Stack from VS for BOTH times the event is called

Installer.exe!Installer.InstallerForm.installButton_Click(object sender = {Text = "Siguiente"}, System.EventArgs e = {X = 21 Y = 10 Button = Left}) Line 226    C#

    [External Code] 

Installer.exe!Installer.Program.Main() Line 21 + 0x1d bytes C#

[External Code]

Edit2
tracing the callstack back with a breakpoint gives:

myInstaller.exe!myInstaller.InstallerForm.installButton_Click
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Control.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WmMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc
System.Windows.Forms.dll!System.Windows.Forms.ButtonBase.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Button.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.Run
myInstaller.exe!myInstaller.Program.Main
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context
mscorlib.dll!System.Threading.ExecutionContext.Run
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart
 ******************* Function: myInstaller.InstallerForm.installButton_Click(object, System.EventArgs), Thread: 0xE00 Main Thread

myInstaller.exe!myInstaller.InstallerForm.installButton_Click
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Control.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WmMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc
System.Windows.Forms.dll!System.Windows.Forms.ButtonBase.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Button.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.Run
myInstaller.exe!myInstaller.Program.Main
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context
mscorlib.dll!System.Threading.ExecutionContext.Run
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart
 ******************* Function: myInstaller.InstallerForm.installButton_Click(object, System.EventArgs), Thread: 0xE00 Main Thread

If i attach to the designer section where the handler is added i get

myInstaller.exe!myInstaller.InstallerForm.InitializeComponent
myInstaller.exe!myInstaller.InstallerForm.InstallerForm
myInstaller.exe!myInstaller.WelcomeForm.btnNext_Click
System.Windows.Forms.dll!System.Windows.Forms.Control.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WmMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc
System.Windows.Forms.dll!System.Windows.Forms.ButtonBase.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Button.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.Run
myInstaller.exe!myInstaller.Program.Main
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context
mscorlib.dll!System.Threading.ExecutionContext.Run
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart
 ******************* Function: myInstaller.InstallerForm.InitializeComponent(), Thread: 0xA34 Main Thread

myInstaller.exe!myInstaller.InstallerForm.InitializeComponent
myInstaller.exe!myInstaller.InstallerForm.performChecks
myInstaller.exe!myInstaller.InstallerForm.InstallerForm
myInstaller.exe!myInstaller.WelcomeForm.btnNext_Click
System.Windows.Forms.dll!System.Windows.Forms.Control.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnClick
System.Windows.Forms.dll!System.Windows.Forms.Button.OnMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WmMouseUp
System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc
System.Windows.Forms.dll!System.Windows.Forms.ButtonBase.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Button.WndProc
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMessage
System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndProc
System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.DebuggableCallback
[Native to Managed Transition]
[Managed to Native Transition]
System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop
System.Windows.Forms.dll!System.Windows.Forms.Application.Run
myInstaller.exe!myInstaller.Program.Main
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context
mscorlib.dll!System.Threading.ExecutionContext.Run
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart
 ******************* Function: myInstaller.InstallerForm.InitializeComponent(), Thread: 0xA34 Main Thread

But this shouldn’t be as it looks like the form is getting created twice? but if i put a breakpoint on the installerform creator it is only called once.

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1 Answer

Editorial Team · Answer 1 · 2026-05-13T12:08:41+00:00

could you add some code of how do you inherit and use buttons?
In C# you should not have a such issue, because there is no Handles keyword.

You may, however, add multiple time handlers to the buttons event click like:

parent
    myButton.Click += myClickAction

child
    sameButton.Click += sameClickAction

When inheriting you should not click on the inherited buttons in designer(that will add a new, maybe the same, action on the inherited button)

Add a breackpoint in the twice executed action, when hit consult the CallStack Visual Studio Window in order to see who calls your method twice…

EDIT

Not sure what happens, but try the following:

Replace:

this.btnNext.Click += new System.EventHandler(this.installButton_Click);

with

this.btnNext.Click -= new System.EventHandler(this.installButton_Click);
this.btnNext.Click -= new System.EventHandler(this.installButton_Click);
this.btnNext.Click -= new System.EventHandler(this.installButton_Click);
this.btnNext.Click += new System.EventHandler(this.installButton_Click);

EDIT2

In order to analyze the calls to your method instantly do the following:

Set a Tracepoint in the installButton_Click method:
alt text http://lh4.ggpht.com/_1TPOP7DzY1E/S13KtR6tpYI/AAAAAAAAC9s/GpCZpXEukv4/s800/3setBreackpoint.png
Edit the tracepoint properties, in order to trace the callstack(or also use just $CALLER – only theprevious function):
alt text http://lh6.ggpht.com/_1TPOP7DzY1E/S13KtE98okI/AAAAAAAAC9o/gW5TfXouQDM/s800/2brackpoint.png
In the Output window deactivate(right click) all messages but “Program Output”;
Analyze your output in run-time:

alt text http://lh4.ggpht.com/_1TPOP7DzY1E/S13Ks9YHEHI/AAAAAAAAC9k/WgnO5cBtUxI/s800/1output.png

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