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Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation.

Question

Friday, September 5, 2008 5:27 PM

  

Hi,

I am writing a web application using .net 3.5 and vs 2008 which allows people to add data to a db via a control panel front end.

Objective: Before committing one of the fields to the db i would like the user to answer Yes, No or Cancel to confirm their action.

I have tried to implement this with a modal dialog box  or message box but the following error appears:

Server Error in '/' Application.

Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.

Source Error:

 

Line 174:

Line 175:            'Exit Sub

Line 176:            If Not modDB.doContinue("Save " & txtEvnName.Text & " as New Event?") Then

Line 177:                modDB.blankControls(divEvn.Controls) 'blank controls

Line 178:                'PopulateEve()

Source File: C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\FuseV2\Fusev2\root\ccp\eventmanagement.aspx.vb **   Line:** 176

Stack Trace:

 

[InvalidOperationException: Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.]

   System.Windows.Forms.MessageBox.ShowCore(IWin32Window owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options, Boolean showHelp) +1799842

   System.Windows.Forms.MessageBox.Show(IWin32Window owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options) +26

   Microsoft.VisualBasic.Interaction.MsgBox(Object Prompt, MsgBoxStyle Buttons, Object Title) +544

   Fusev2.modDB.doContinue(String prompt, Object& obj) in C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\FuseV2\Fusev2\mods\modDB.vb:589

   Fusev2.EventManagement.btnAddEvn_Click(Object sender, EventArgs e) in C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\FuseV2\Fusev2\root\ccp\eventmanagement.aspx.vb:176

   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105

   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107

   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7

   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11

   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746

 

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

 

I would then like to carry on with the code behind the aspx and process the answer and its corresponding actions.

 

 

The function which is causing this error is:

 

    Public Function doContinue(ByVal prompt As String, Optional ByRef obj As Object = Nothing) As Boolean

        If Not obj Is Nothing Then

            cantSeeMee(obj)

        End If

        doContinue = CBool(MsgBox(prompt, MsgBoxStyle.YesNo, "") = MsgBoxResult.Yes)

    End Function

 

Now I don’t think you will need the cantSeeMee(Object) Function because obj is null, hence cantSeeMee() is never called.

 

I would like support on the following:

1 - Can message boxes be used in asp.net 3.5 to achieve my above objective? And if yes how?

2 - If not what are my alternatives?

Language used: VB.net

Thanks to everyone who responds.

All replies (10)

Monday, September 8, 2008 7:40 AM ✅Answered | 2 votes

Hello!

in Web Applications, when you create a Modal Dialog Box using MsgBox or MessageBox, even it would of been shown, it would of been shown in your server, not on the clients computer.

I suggest you to use an ajax:ConfirmButton or ajax:ModalPopup or another Ajax Control spread over the web.

however, it is certainly impossible to Show a Windws based Modal Box on the client using MsgBox or MessageBox etc.

BTW, these questions might have a quiker answer in ASP.NET forums.

hope this was helpful, Shimmy.

Shimmy

Monday, September 8, 2008 8:52 AM | 2 votes

Take a look at MessageBoxOptions Enumeration.  You can specify ServiceNotification, or DefaultDesktopOnly options, for when you have no form.

Here is an example.

 

        MessageBox.Show("Message", "Caption", MessageBoxButtons.OK, _

        MessageBoxIcon.Information, MessageBoxDefaultButton.Button1, _

        MessageBoxOptions.ServiceNotification)

 

Monday, September 8, 2008 9:00 AM

I wish I would of had this functionality in web :-(
you can develop one if you're looking for chalenges and you have free time...

you can even override the existing ConfirmButton as it's open source.

anyway, if you did or you find such a control, please post a link here so we can all enjoy it

thank you!

Shimmy

Monday, April 19, 2010 2:37 AM | 1 vote

Why not just do the confirmation on the clientside using javascript before you postback to write the data to the db? or am i missing something?Thanks..

Monday, April 19, 2010 3:34 AM

Good idea, but is harder to control from server on special server event, or if you want to get the dialog result, or when you want to display dynamic data.

The Ajax tools allow all this easily with no getting the hands dirty with js.

Shimmy

Wednesday, September 29, 2010 11:11 AM

Thanx......I am facing the same problem,, problem get solved........

Wednesday, October 6, 2010 11:19 AM

this code is not working when we put our web page put on server.

Tuesday, February 15, 2011 8:51 PM

I am having the same problem with a popup message box not displaying from a server.  Did anyone find a solution to this problem?

Thanks

Thursday, March 31, 2011 10:01 AM

Use this function

Public

Sub ShowMessage(ByVal MessageText As String, ByVal MyPage As

Page)

MyPage.ClientScript.RegisterStartupScript(MyPage.GetType(), _

 

"MessageBox", "alert('" & MessageText.Replace("'", "\") & "');", True)

 

 

End Sub 

Friday, April 15, 2011 6:15 PM

M sirvio mucho para mi windows service :D