NullReferenceException from FolderBrowserDialog

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  - 1
    - WinProc Hi I'am Trying to overrides WinProc to change the NonClient Area to use my own skin once i start the Debugging i can see the the changes, and then the form will paint the standard windows nonClient Area and form will be frozen the code looks something like that Public Class Form1 ' API Declarations Declare Function ScreenToClient Lib "user32" (ByVal hwnd As Integer, ByRef lpPoint As Point) As Integer Declare Function GetWindowDC Lib "user32" (ByVal hwnd As Integer) As Integer Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Integer, ByRef lpRect As Rectangle) As Integer <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _ Protected Overloads Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message) 'handle hits here If m.Msg = 132 Then ElseIf m.Msg = 133 Then ' (WM_NCPAINT) Dim g As Graphics = Graphics.FromHdc(GetWindowDC(Me.Handle)) Dim aRect2 As New Rectangle() GetWindowRect(Me.Handle, aRect2) Dim pt As New Point(aRect2.Left, aRect2.Top) ScreenToClient(Me.Handle, pt) Dim pt2 As New Point(aRect2.Right, aRect2.Bottom) ScreenToClient(Me.Handle, pt2) Dim aRect As New Rectangle(0, 0, aRect2.Right - aRect2.Left, aRect2.Bottom - aRect2.Top) Dim imgTopLeft As Image = Image.FromFile("c:\skins \TopLeft.png") Dim imgTopMid As Image = Image.FromFile("c:\skins \TopMid.png") Dim imgTopRight As Image = Image.FromFile("c:\skins \TopRight.png") Dim imgBottomLeft As Image = Image.FromFile("c:\skins \BottomLeft.png") Dim imgBottomMid As Image = Image.FromFile("c:\skins \Bottom.png") Dim imgBottomRight As Image = Image.FromFile("c:\skins \BottomRight.png") Dim imgRight As Image = Image.FromFile("c:\skins \Right.png") Dim imgLeft As Image = Image.FromFile("c:\skins\Left.png") g.DrawImageUnscaled(imgTopLeft, 0, 0) g.DrawImage(imgTopMid, imgTopLeft.Width, 0, (Width - (imgTopRight.Width + imgTopLeft.Width) + 2), imgTopMid.Height) g.DrawImage(imgTopRight, Width - imgTopRight.Width, aRect.Top, imgTopRight.Width, imgTopRight.Height) g.DrawImage(imgBottomLeft, aRect.Left, Height - imgBottomLeft.Height, imgBottomLeft.Width, imgBottomLeft.Height) g.DrawImage(imgBottomMid, imgBottomLeft.Width, Height - imgBottomMid.Height, Width - imgBottomLeft.Width, imgBottomMid.Height) g.DrawImage(imgBottomRight, Width - imgBottomRight.Width, Height - imgBottomRight.Height, imgBottomRight.Width, imgBottomRight.Height) g.DrawImage(imgRight, Width - imgRight.Width, imgTopRight.Height, imgRight.Width, Height - imgBottomRight.Height) g.DrawImage(imgLeft, Left, imgTopLeft.Height, imgLeft.Width, Height) g.Dispose() Else MyBase.WndProc(m) End If End Sub End Class Tag: NullReferenceException from FolderBrowserDialog Tag: 116970
  - 2
    - Context menu on grid How can I find out on which row of a grid that the user right-clicked? I don't want to assume it was the selected row. TIA, -- -Will Tag: NullReferenceException from FolderBrowserDialog Tag: 116968
  - 3
    - Why can't DataGridView Checkbox cast 0 to Int16? OK, have a simple .Net 2.0 WinForm app, with a DataGridView, which contains a checkbox bound to an Int16 (was a byte). For a certain user (who will be the main user of this app), when clearing the checkbox, and then moving the focus, generates an exception. The exception basically say that 0 is not a valid value for an Int16. The user can tick the checkbox, and not raise an error. It seems that 1 is a valid value. Other users don't have this problem, and it's not linked to the PC being used. Have had 2 users logon onto the same PC, and getting different results. Roaming profiles are in use, so common sense says it's linked to the user's profile. Checked the regional settings, and nothing stands out. Should have said the OS is XP SP2. So, does anyone have an ideas as what I need to check/change in the user's profile? Thanks in advance Tag: NullReferenceException from FolderBrowserDialog Tag: 116966
  - 4
    - Tab control validation and losing events Hi, Hope someone can help me with this - been going round and round with no progress. I have a form with a tab control containing 2 tabs. Tab 1 has a panel containing a text box and a save & cancel button. We have a validation event on the panel to check the text field is valid and if not we output a message. This all seems to work fine until there is an invalid entry in the textbox, validation message is displayed and e.cancel is set to true. Although the tab doesnt switch pages (correct behaviour) focus seems to be in the ether..... The buttons within the panel will now not fire their click events. Note: If no message is output (or an error provider is used) then the buttons events fire correctly. There is no databinding etc. So issue seems to be output of message in the validating event causes tab control to lose track of focus? - Any one had this before? Help greatly appreciated. Thanks in advance - code below Code: private void pnlOwners_Validating(object sender, CancelEventArgs e) { e.Cancel = false; if (_fieldsChanged) { e.Cancel = true; MessageBox.Show("Correct error before proceeding", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Information); } } Tag: NullReferenceException from FolderBrowserDialog Tag: 116963
  - 5
    - Terminal Server 2003 I've developed a winform application which uses Crystal reports, everthing works fine on WIN XP, VISTA SERVER2003, but when installed on a terminal server, the reports want work, what can be the solution for this problem? -- Best regards Nicole Tag: NullReferenceException from FolderBrowserDialog Tag: 116962
  - 6
    - Problems Background Printing PDF from C# Application Hello, We are having a lot of problems trying to print a PDF file in the background using a C# application that is executed via SQL Server Agent. The output should be printed to a local printer (HP Color LaserJet 1600) connected via a USB port. We have a C# application that calls System.Diagnostics.Process to run Acrobat Reader (weâ??ve tried both v8.0.0 and v8.1.2), open an existing PDF file, and send it to the local printer. The code is shown below. System.Diagnostics.Process process = new System.Diagnostics.Process(); process.Refresh(); process.StartInfo.Arguments = "/t C:\Temp\TestPDF.pdf"; // and tried "/t C:\Temp\TestPDF.pdf PrinterName" process.StartInfo.CreateNoWindow = false; //process.StartInfo.Domain; //process.StartInfo.ErrorDialog = false; process.StartInfo.FileName = "C:\\Program Files\\Adobe\\Reader 8.0\\Reader\\AcroRd32.exe"; //process.StartInfo.Password; //process.StartInfo.UserName; process.StartInfo.UseShellExecute = false; //process.StartInfo.Verb = "Print"; process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; process.StartInfo.WorkingDirectory = new System.IO.FileInfo(m_PDFPathFile).DirectoryName; process.Start(); Weâ??ve tried just about every combination of the process objects properties trying to get the PDF file to print. But, it never works. The code executes without error, just nothing ever shows up on the printer. More infoâ?¦ Weâ??re executing our custom C# application via a SQL Server Agent job. SQL Server Agent is running as Local System account. The Job Step Type is Operating System (CmdExec), with Run as set to SQL Server Agent Account. The command is simply the path and file name of our custom C# application (e.g., C:\Temp\PrintPDF.exe). Again, we get no errors/exception and no job failures, but the PDF never gets printed. How can we re-code or fix our situation? What can be done/tried? All help is appreciated. We are stuck. Thanks. Tag: NullReferenceException from FolderBrowserDialog Tag: 116960
  - 7
    - WebBrowser control I'm trying to do my own scrolling with the WebBrowser control. I can use the WebBrowser.Document.Window.ScrollTo method to scroll to a specific position but how do I get my current scroll position? I know when the document loads that I'm at scroll position 0,0. Then each time I scroll (by 200 for example) I just keep a record of my new scroll position. This works until I get to the end of the document. The ScrollTo doesn't return any feedback when it gets to the end of the document, so I don't know when stop scrolling and when to stop adding 200 to my internal scroll position. Is there a way to read the current scroll position? Tag: NullReferenceException from FolderBrowserDialog Tag: 116959
  - 8
    - Windows DPI scaling Hi, C# .NET 2.0 I'm developing a windows application that will run on a number of machines typically with DPI of either 96 or 120. By setting the AutoScaleMode on different forms to DPI I get the required scaling results. However, I have one form that contains a richtextbox that's anchored to top, left and bottom borders and where I change the width of the richtextbox depending on values taken from a PageSetupDialog control. Something like this: this.pageWidth = this.pageSetupDialog1.PageSettings.Bounds.Width - this.pageSetupDialog1.PageSettings.Margins.Left - this.pageSetupDialog1.PageSettings.Margins.Right; this.txtWritingPad.Width = pageWidth; The problem now is that a single line of text that fits on one single line in 96 dpi gets wrapped to the second line in 120 dpi. Font and font size are the same. I need the text/font to appear the same on both machines. i.e. on one line from left to right. I thought that maybe because I was explicitly setting the width of the control at run time I would have to call PerformAutoScale() but that doesn't seem to have any effect. I'm obviously missing something. Can anybody help? Thanks, Damien Tag: NullReferenceException from FolderBrowserDialog Tag: 116956
  - 9
    - Books recommendations please Hi I need to develop winform database applications and wondering is these two books will get me there; Data Binding with Windows Forms 2.0: Programming Smart Client Data Applications with .Net http://www.amazon.co.uk/Data-Binding-Windows-Forms-2-0/dp/032126892X/ref=wl_it_dp?ie=UTF8&coliid=I2L84GECRS6E6P&colid=399925I1FY0N8 Windows Forms 2.0 Programming http://www.amazon.co.uk/Windows-Forms-Programming-Chris-Sells/dp/0321267966/ref=wl_it_dp?ie=UTF8&coliid=I1RY8RDOG4LBP1&colid=399925I1FY0N8 I already have Bill's 'Hitchhiker's guide to VS and SQL Server'. Any additional recommendations would be appreciated too. Basically anything that will get me off your backs. Thanks Regards Tag: NullReferenceException from FolderBrowserDialog Tag: 116953
  - 10
    - ComboBox LostFocus 1. I make a selection in a combobox 2. I click outside my window on the desktop Result: The Combobox lostFocus fires multiple times until my application blows up. How can I work around this problem? -- Arne Garvander Certified Geek Professional Data Dude Tag: NullReferenceException from FolderBrowserDialog Tag: 116951
  - 11
    - 'ShowInTaskBar crashes .NET in Form Activated and Deactivate events Copyright assigned 2008 to "microsoft.public.dotnet.framework.windowsforms" Usenet Forum (see note at end for clarification) I am quite clear right now that this problem ONLY arises when you try to change a Form's ShowInTaskBar property in its Form_Activated and Form_Deactivate events. I believe there is a high probability that this is related to the fact that ShowInTaskBar under the hood is invoking the window styles api ... most likely the window is being re-created ... and this is triggering recursive firing of events somehow interacting with whatever the Activated and Deactivate events are doing. It is surprising that I have not been able to find a definitive statement from MS on this on MSDN, but right now (since I switched to Internet Explorer 8 beta 1) MSDN pages take literally minutes to refresh in my browser. This is in part due to a significant apparent breakdown in my ISP's (northern Thailand) ADSL service which has lasted ten days now. So those factors have limited my time for searching MSDN. I am creating a work around for this now in my own application using a "dummy window" as a minimization placeholder for the case when the end-user selects the option to show only the current active window in the taskbar (rather than just allowing all active open windows of #n windows to show in the taskbar). I tried several "work-arounds" for this that involved things like raising an event up to a static event-handler in a Class from the Activated and Deactivate events : whatever I tried ... if it was triggered by these two events, it crashed .NET. It's a kludge, it's ugly, but it will work. I have no idea if you could work around this using API's or not, but the application I am writing must not use WndProc's and such. best, Bill copyright notice : for use by any non-commercial, non-profit, advertising free Usenet or Internet forum : you may not republish this message on any website with commercial advertisements. Of course no one has any "copyright" on technical issues and solutions, only on the specific message and text in which they are embodied. Tag: NullReferenceException from FolderBrowserDialog Tag: 116949
  - 12
    - Available Bluetooth Serial Ports in Vista I'm using the following code to determine the available serial ports: ComboBoxPort.Items.Clear() For Each sp As String In My.Computer.Ports.SerialPortNames ComboBoxPort.Items.Add(sp) Next It worked well in XP, but under Vista (now with SP1) the Bluetooth ports don't show correctly. We have half a dozen different brands and types of Bluetooth on various computers, and all are displaying this behaviour. I get this list: COM1 COM3 COM4 COM10ñ COM12ñ COM92 COM11 The ñ letters are random and is different every time the sub is called. Device Manager reliably shows: Communications Port (COM1) PCI Serial Port (COM3) PCI Serial Port (COM4) Standard Serial over Bluetooth link (COM10) Standard Serial over Bluetooth link (COM11) Standard Serial over Bluetooth link (COM12) Standard Serial over Bluetooth link (COM9) Any help, please? -- Dave Harry Tag: NullReferenceException from FolderBrowserDialog Tag: 116948
  - 13
    - Web service, VPN and data cached This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C8A399.6F614AB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I have a problem and hope you can give some advice. I have a windows Form which uses web service to communicate with our web = site and database. It's working fine in most of our offices. However one = of our offices use VPN(virtual private network) to do their work. They = often(not always) get error when they use the form. I look at into it = and found that no matter how they change the date range, the query = results are always the same. If they donot use the form for sevral days, = it will work again. If they use it again in the same day, then the error = will come up. It sounds data are cached somewhere in the network or in = their computer. Do you know where the data cached and how to prevent = this? Thanks, Dennis Huang ------=_NextPart_000_0008_01C8A399.6F614AB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2912" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT size=3D2>Hi,</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>I have a problem and hope you can give some=20 advice.</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>I have a windows Form which uses web service to = communicate=20 with our web site and database. It's working fine in most of our = offices.=20 However one of our offices use VPN(virtual private network) to do their = work.=20 They often(not always) get error when they use the form. I look at = into it=20 and found that no matter how they change the date range, the query = results are=20 always the same. If they donot use the form for sevral days, it will = work again.=20 If they use it again in the same day, then the error will come up. It = sounds=20 data are cached somewhere in the network or in their computer. Do you = know where=20 the data cached and how to prevent this?</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Thanks,</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Dennis Huang</FONT></DIV></BODY></HTML> ------=_NextPart_000_0008_01C8A399.6F614AB0-- Tag: NullReferenceException from FolderBrowserDialog Tag: 116946
  - 14
    - App.Settings and future upgrades How can I update Application-scope settings for Windows Forms applications? For example, if i make a setting: Name: WebsiteUrl, Type: String, Scope: Application, Value: www.domain.com AFter this project is deployed on a user's workstation, is there any way to modify this value on subsequent installations? Ideally, I would prefer not to overwrite user-scoped settings. Tag: NullReferenceException from FolderBrowserDialog Tag: 116945
  - 15
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  - 16
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  - 17
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  - 18
    - Egghead Cafe copying messages on this forum to their web-site Hi, Recently I posted a message here on issues with setting ShowInTaskBar at runtime; no one's responded yet, but I am not complaining :) I've always felt that getting a response in groups like these is a "bonus," and I'm always appeciative of the generous gift of time by experts that goes on here, from people like Bob Powell, Frank Hileman, Jon Skeet, Nicholas Paladino, and so many others ! I was doing a web search on this issue (Google), and came across this : http://www.eggheadcafe.com/software/aspnet/32030563/setting-showintaskbar-to.aspx I was astounded to find that it was a copy of my post to this group. There was no response, or comment, just a complete copy. I doubt that there is any technical legal issue here of infringement on intellectual property : I didn't put a copyright notice on my post (I can only imagine the absurdity of that), but I do feel that just copying posts is a shady business practice if the web site gets its revenues from advertisers based on number of hits on the site as a whole. And I've expressed this opinion directly to the operators of the site. Is this a standard practice that is also going on on other web sites ? First time I've seen it. best, Bill Tag: NullReferenceException from FolderBrowserDialog Tag: 116940
  - 19
    - Datagridview sort When I click a column in my datagrid a sort occur. If I click the column with dates, it sorts in m/d/y order. I would like it to either sort in y/m/d order or I would like to turn off the sort. It seems like by date is in a text format. Maybe I can change the data type to datetime and the sort will work again. (In worst case I have to change my dates to figs, maybe figs sort better than dates) -- Arne Garvander Certified Geek Professional Data Dude Tag: NullReferenceException from FolderBrowserDialog Tag: 116938
  - 20
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  - 21
    - Menu Item Access Keys Not visible Hello, I know this topic has been discussed before but my problem is kind of different. I have the following menu items, File View Tools Help Now i have checked "hide underline letters for navigation until i press the Alt key" in the desktop appearance effects. Now when i "click" on file menu, it shows me the access keys i have set for the sub-menu items. Same for Help and Tools. But when I click on View, the sub-menu appears with all items NOT showing the access keys. The menu items in view menuitem are 3 menu items with further menu items, and 2 items where checked property is true. The strange thing is, if i click on view, it would not show the access keys. If i press Alt and then V to go to view menu, it does show me access keys for all the submenus, the ones that i have set in the first place. The problem does get solved by unchecking the "hide underline letters ....." in the desktop appearace effects. But 1. i want to know the cause, 2. i cant expect my customers to do that. Tag: NullReferenceException from FolderBrowserDialog Tag: 116932
  - 22
    - unable to open form in designer Hi, I am trying to open window form in designer (this form inherits another window form "BaseForm" which is in same c# project) , am getting exception and Visual studis is asking to debug or cancel message alert. I debugged and its said "Could not load file or assembly 'Wrappers.CLI, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified. " The WSOD contains: One or more errors encountered while loading the designer. The errors are listed below. Some errors can be fixed by rebuilding your project, while others may require code changes. "Could not load file or assembly 'Wrappers.CLI, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified." Hide at MyProject.BaseForm..ctor() this is in C# project (VS 2005). it has reference to 'Wrappers.CLI' dll. I tried with 1. rebuilding 2. steps in http://www.codeproject.com/KB/cs/wsod.aspx but none was working.. Thanks, Ramki Tag: NullReferenceException from FolderBrowserDialog Tag: 116929
  - 23
    - Binding navigator Hi, I have a binding navigator which has 1 binding source bind to it. I have some textboxes bind to the binding navigator.I have some validations to be done at lost focus events of all the text boxes. the system is getting hang up if any one is trying to give invalid input,rather than what is supposed to be prompted (I have those validations written in lost focus event of those textboxes) . Can any one help me in this regard. Tag: NullReferenceException from FolderBrowserDialog Tag: 116928
  - 24
    - Bug in VS.NET 2005 for click-once deployment It appears there's a bug in Visual Studio 2005 when trying to deploy a click-once application (this is a completely different issue than my last post, in case anyone's keeping track). When I set my publishing settings, the first time, it works just fine. When I want to publish to a different server, the part of the publish wizard that asks "How will users install the application?", the "From a Web site" setting is ignored and the original value I entered from the FIRST deployment is used. Now, once in a blue moon, it'll change, but it's unpredictable and rare. The only way I've found to "fix" it is to use a file searching utility (I use TextPad's "Search in files" feature) to search all files in the entire solution folder tree for occurances of the old URL. It appears that there's 3 items storing the URL in the .csprog file, one of which is the culprit (can't recall right now which), but they are: <PublicUrl> <InstallUrl> <UpdateUrl> I think it's the InstallUrl that holds onto the old setting. I have to manually edit the project file with a text editor to get the darn thing to publish and behave properly. Am I doing something wrong or is this a bug? Is there a better way to do this? TIA. Tag: NullReferenceException from FolderBrowserDialog Tag: 116924
  - 25
    - Click-Once deployed app - need to change .config.deploy file I have a click-once deployed application that I need to change which web services it references *AFTER* deployment. When I change my deployed xxxxxx.config.deploy file on the server so that it references a different set of web services, the application continues to access the old webservices. Before you think you have the answer, let me tell you what I've done (this has been a problem for about a year now, but we're determined to get it resolved): I manually edited the .config.deploy file to change the URLs of the web services (original deployment pointed to a dev instance of the web services), I'm changing them to point to the testing/staging environment web services, then will change to point to production as the compiled deployment moves it's way torwards acceptance and finally production. When I edited the file, I expected the app to refuse to run, but it didn't. It ran without complaining (unlike what happens if I edit the .application file without re-signing it). I even removed the .config.deploy file and still no complaints and still it used the dev web services. Yes, I re-signed the manifest with mageui.exe. I edited the .cong.deploy file, but it appears the app is not using the .config.deploy file at all. In the source code, there's a Settings.Designer.cs file that's generated based on my app.config and in there is hard-coded the values of the web service URLs as they are at the time of publish from Visual Studio to the development server. Our deployment process has always been with web apps and this is new territory for us (in spite of the fact that this app has been around for about a year now... it's still our first one and has recently gone to production). Our deployment procedures are as follows: 1. Compile and then the developer deploys to dev. then developer asks admins to move it to staging (having admins changing the connection strings and such in the web.config file). Developers don't have write access to the staging envrionment. 2. Testers test application in the staging environment. If all goes well, developer asks admins to move app from staging to production, again making necessary changes to the web.config file. Developers don't have access to the production environment. On subsequent updates, the web.config file is just not copied, unless there's anything new in it, then the admins are asked to add the new items to the existing web.config files in each environment. This process has worked well since the 1990's, but now with click-once deployed apps, that procedure isn't working because we can't find a way to make changes to the .config.deploy file without having to publish from Visual Studio 3 seperate times, making the changes from within Visual Studio for each environment. In addition, we can't move a single deployment from environment to environment. We have to make 3 seperate builds, making it impossible to prove that what went to production was truly what was tested. Any help would be GREATLY appreciated!!! Tag: NullReferenceException from FolderBrowserDialog Tag: 116923
- Next
  - 1
    - Media Control >> Tag readers Hello there, just wondering if n e one has had a chance of looking in to a wmv tag reader, i have contocted an AVI, MPEG, MPG, MP3 header readers but can't seem to find an wmv tag reader anywhere on the internet or information about how to read it. Please can maybe some on help. *** Sent via Developersdex http://www.developersdex.com *** Tag: NullReferenceException from FolderBrowserDialog Tag: 116920
  - 2
    - isDirty Does a windows textbox have a property that tells if the user has entered anything into a textbox on a windows. -- Arne Garvander Certified Geek Professional Data Dude Tag: NullReferenceException from FolderBrowserDialog Tag: 116919
  - 3
    - ScrollControlIntoView c# Hi I have a problem with displaying textBoxes in a tabPage on a form. I have 3 tabs, the 2nd tab 'tab2' the user enter the number of textBoxes required to be displayed in 'tab3', when they leave 'tab2' and click on 'tab3' the code place the textboxes at the bottom of 'tab3' adding additional ones above them. This requires the 'AutoScroll' to start at the bottom of 'tab3'. I'm using 'ScrollControlIntoView' to display the textBox. When you first click on 'tab3' from 'tab2', the scroll bars do not go to the bottom of the 'tab3' where the text boxes are added. However this works the 2nd time you click 'tab3' and the scroll bars start at the bottom of 'tab3' where the textboxes are placed. Can anyone help? I have supplied the basic code I'm using. Thanks in advance Cyclone //////////////////////////////////////////////////////////////////////////////// using System; using System.Globalization; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Reflection; using System.Diagnostics; namespace Example { public partial class MainForm : Form { private TextBox txtBx_Val00 = new TextBox(); int N_val2 = 0; private void tab2_Leave(object sender, EventArgs e) { //Variable is populated by a text box on tab2 N_val2 = int.Parse(txtBx_N2a.Text);//No. of textBoxes to be displayed FloorData_Method(); } private void FloorData_Method()//displays floor rows { //Row 00 this.txtBx_Val00.Text = "0"; this.txtBx_Val00.Size = new Size(56, 20); this.txtBx_Val00.Location = new Point(27, 3597)//places textBox at the very bottom of the tab //Adds Row00 this.tab3.Controls.Add(txtBx_Val00); this.tab3.ScrollControlIntoView(this.txtBx_Val00); """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" } } } ////////////////////////////////////////////////////////////////////////// Tag: NullReferenceException from FolderBrowserDialog Tag: 116918
  - 4
    - ScrollControlIntoView c# Hi I have a problem with displaying textBoxes in a tabPage on a form. I have 3 tabs, the 2nd tab 'tab2' the user enter the number of textBoxes required to be displayed in 'tab3', when they leave 'tab2' and click on 'tab3' the code place the textboxes at the bottom of 'tab3' adding additional ones above them. This requires the 'AutoScroll' to start at the bottom of 'tab3'. I'm using 'ScrollControlIntoView' to display the textBox. When you first click on 'tab3' from 'tab2', the scroll bars do not go to the bottom of the 'tab3' where the text boxes are added. However this works the 2nd time you click 'tab3' and the scroll bars start at the bottom of 'tab3' where the textboxes are placed. Can anyone help? I have supplied the basic code I'm using. Thanks in advance Cyclone //////////////////////////////////////////////////////////////////////////////// using System; using System.Globalization; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Reflection; using System.Diagnostics; namespace Example { public partial class MainForm : Form { private TextBox txtBx_Val00 = new TextBox(); int N_val2 = 0; private void tab2_Leave(object sender, EventArgs e) { //Variable is populated by a text box on tab2 N_val2 = int.Parse(txtBx_N2a.Text);//No. of textBoxes to be displayed FloorData_Method(); } private void FloorData_Method()//displays floor rows { //Row 00 this.txtBx_Val00.Text = "0"; this.txtBx_Val00.Size = new Size(56, 20); this.txtBx_Val00.Location = new Point(27, 3597)//places textBox at the very bottom of the tab //Adds Row00 this.tab3.Controls.Add(txtBx_Val00); this.tab3.ScrollControlIntoView(this.txtBx_Val00); """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" } } } ////////////////////////////////////////////////////////////////////////// Tag: NullReferenceException from FolderBrowserDialog Tag: 116917
  - 5
    - Application.DoEvents() throws null reference exception Hi, I have an application where I have used Application.DoEvents() method on the click event of a NumericUpDown. This particular method is throwing "Object reference not set to an instance of an object" error.. Does anyone have any idea about it? Regards, Bharathi Tag: NullReferenceException from FolderBrowserDialog Tag: 116916
  - 6
    - Simple, Simple Question In ASP.Net a datagridview has an event called RowDataBind. What's the equivalent in a Windows Form Gridview? Ross Tag: NullReferenceException from FolderBrowserDialog Tag: 116911
  - 7
    - Deploying native code. The scenario is we're about to release an exe to our clients. It's a winforms application that uses reflection, remoting, generics, and serialization. We want to protect the intellectual proprety rights of our code. One solution is to obfuscate the exe. I've come across some 3rd party solutions that claim they can compile the exe to native code (xenocode, remotesoft, etc). I'm wondering if there is some tool in the .NET framework that can compile winforms applications directly to native code, thereby bypassing MSIL + JIT compilation? The native executable can then be deployed. I've read about the ngen utility, but it doesn't seem applicable in this case. From my understanding, ngen will precompile the exe and add it to the native image cache on the respective machine. What I'm looking for here is a way to bypass MSIL + JIT compilation. Thank you! Tag: NullReferenceException from FolderBrowserDialog Tag: 116910
  - 8
    - setting ShowInTaskBar to 'false at run-time : strange errors, crashes .NET 2.0, Visual Studio 2005 Hi, I have several open windows, all instances of the same form template created dynamically in response to a user action at run-time. A user option for the application is to show all open windows in the task bar, or only the current active window. I thought I could write handlers for the Form_Activated and Form_Deactivate events of all these instances of a form_template, but I'm running into strange errors when I set 'ShowInTaskBar to false in the 'Deactivate event like : "can't create window handle," or "callback on a delegate that has been garbage collected." At first I thought these error might be related to deisgn mode, but they persist when I run the .exe file, giving an error dialogue that does not provide the usual debugging information. Googling on "microsoft: showintaskbar" led to several reports that suggest errors with setting showintaskbar to false at runtime. Francisco Balena at : http://www.devx.com/vb2themax/Tip/18334 Says the property is read-only at run-time, but in another part of my application I have a menu that toggles showing all, or only the active form, in the taskbar : this code loops through a collection of open forms I maintain and sets showintaskbar properly and with no errors ! I am aware that winforms does some strange stuff when you set ShowInTaskBar to 'false : "After doing some research, I found that setting Form.ShowInTaskbar=false will close window's WS_EX_APPWINDOW flag, and set window's owner form to WindowsFormsParkingWindow, which is an invisible toplevel window(internal )" comments Jeffrey Tan from Microsoft at : http://www.dotnet247.com/247reference/msgs/57/285697.aspx Okay my questions : 1. is switching a window's ShowInTaskBar status something that will require use of Interop and API's in .NET 2.0 ? 2. has there been a change in versions of .NET > 2.0 that make this possible without use of API's. In this particular design scenario there is no one window which is always necessarily visible, no "master form." Each winform created has its Parent property set to Null. And, yes, Form_Closing events are modified to detect need to terminate the app because, in this case I am using Application.Run() after an initial template form is shown. thanks, Bill Tag: NullReferenceException from FolderBrowserDialog Tag: 116909
  - 9
    - NotifyIcon on a Dialog Box [Using VB.NET 2005] We've got an old application that has been modified quite a bit. Originally, it was just a single form application that hid in the Task Bar Tray using a Notify Icon. Later, we had to add a Custom Dialog Box to the project. Now, it has been determined that the project would be best served by the Dialog Box only, and eliminate the main form. So, the project is now a Console-like Application that starts with a Main Module. The Notify Icon had to be included with the Dialog Box, otherwise we weren't able to make it work. The Notify Icon has a Context Menu Strip and events for Click and Double Click. When the Main Module starts, it creates a new instance of the Dialog Box, but does not show it. When the Dialog Box is created, it creates and shows the Notify Icon. If you are still reading this, here is the problem: Unless the Dialog Box is being displayed (dialog1.ShowModal), all the Notify Icon will do is show its Balloon Message. The Click, Double Click, and Context Menu Strip does not react at all. Any idea why? How would I get this to work? Tag: NullReferenceException from FolderBrowserDialog Tag: 116908
  - 10
    - Need 2nd opinion about program style This might be a silly question but.... I have not made much use of modules in recent years. I've been called on to translate an old VB6 program to Dot Net 2.0. Aside from the sheer complexity and lack of docs, there is one thing that caught my attention: The original programmer made a great deal of use of modules in his DLLs. One element of his style was to create class declarations in the module (Public x as Class1) and then set x to reference the class in the class itself (x = Me). Now I've whipped up a little test program and I know this still works but I was just wondering how this measures up as acceptable (or should I say 'modern') programming style? (It seems an innocent enough technique but given that the legacy program as a whole is major spaghetti, I thought I'd ask for a second opinion.) Tag: NullReferenceException from FolderBrowserDialog Tag: 116907
  - 11
    - Setup of .net 3.5 fw takes FOREVER - idea why? I created a program (.net 3.5). I created a setup program and tried to install it on another computer. The .net 3.5 framework took like 25 minutes to install. Any idea why? Another customer had a similar issue. They state that the fw was like 197mb. Also, they had an error like this: Component .NET Framework 3.5 has failed to install with the following error message: "The wrong diskette is in the drive. Insert %2 (Volume Serial Number: %3) into drive %1. " The following components failed to install: - .NET Framework 3.5 See the setup log file located at 'C:\Users\QUENCH~1\AppData\Local\Temp\VSDA15D.tmp\install.log' for more information. Any ideas on these 2 issues? Tag: NullReferenceException from FolderBrowserDialog Tag: 116904
  - 12
    - =?Utf-8?Q?How_to_redirect_multiple_website?= Hi Guys, I have multiple domain names www.alnajdawi.com, alnajdawi.com, www.alnajdawi.net, alnajdawi.net as a host headers in IIS 6.0 I want to know how can I redirect all these URLâ??s to one URL www.alnajdawi.com, so if a user entered one of these URLâ??s he has to be redirected to www.alnajdawi.com Thanks, MSN Tag: NullReferenceException from FolderBrowserDialog Tag: 116903
  - 13
    - GC.Collect() not cleaning memory, how to find out what references to lots of memory still exist? GC.Collect() not cleaning memory, how to find out what references to lots of memory still exist? When all my processign is done i set everything to null and then: GC.Collect(); and then GC.WaitForPendingFinalizers(); but it still shows that my process takes 400 MB of memory. Is there any easy way to see what references that I forgot to set to null so that the memory cleas up on GC.Collect() ? Tag: NullReferenceException from FolderBrowserDialog Tag: 116899
  - 14
    - ".resx" files not kept up-to-date by Visual Studio Hi there, Can anyone explain why the assembly qualified names seen in the ".resx" file for each form in an application aren't kept up-to-date by Visual Studio. For instance, if a dialog uses a user control from some other library in the same solution, the user control's assembly qualified name will appear in the dialog's ".resx" file. Each time the control's library is compiled however, the library's version is incremented but the ".resx" file continues to show the original version number. How then does Visual Studio load it when the dialog is displayed in the Visual Studio designer? If all projects are signed then the control's library identity won't match what's in the '.resx" file but Visual Studio seems to ignore this. Can anyone shed any light on the situation? Thanks in advance. Tag: NullReferenceException from FolderBrowserDialog Tag: 116898
  - 15
    - Bug in ComboBox with AutoCompletion? Hi, I have a strange problem. The Combobox component always raises an OnTextChanged event when it is validated and auto completion is activate. Take a look at .NET framework source code, ComboBox.cs, method "OnValidating". This method calls "NotifyAutoComplete()", which itself calls "OnTextChanged" when the selected index was not changed - it does not check if the text was really changed! This for example causes that the OnTextChanged event is always raised when the ComboBox looses focus. There are several other ways where the event is raised where it should not. Any ideas? Carsten Tag: NullReferenceException from FolderBrowserDialog Tag: 116897
  - 16
    - General question about VB6-Dot Net conversion I've been tasked with converting a VB6 exe (plus associated dlls.) The conversion is not supposed to be exact so the conversion wizard is probably not an option. I'm more concerned about basic conceptual matters at this point (especially since the legacy code is extremely complex and downright strange in places.). Can anyone point me to a favorite reference or discussion on this subject? (I can probably wing it but I'd like to avoid common pitfalls.) Tag: NullReferenceException from FolderBrowserDialog Tag: 116896
  - 17
    - image from url in datagridview Does anybody know if it's possible to have a winform datagridview show an image in a column that comes from a url? thanx, Tom Tag: NullReferenceException from FolderBrowserDialog Tag: 116895
  - 18
    - Installation problem Hi people I am having problems with DotNet. I accidently deleted .net 2 sp1 from my machine, and I need to re-install. I have searched the MS site for information, and have followed the advice I found. My problem is a round robin thing whereby I can not install .Net 2 because my machine insists that it is incompatible. I have done all I can from the information I have from MS KBs. I have .net 1.1 installed, .net 2 refuses to re-install as does .net 2 sp1. I need a foolproof (!) way of uninstalling and re-installing this software. (Even MS Update fials to install). Help?! Tag: NullReferenceException from FolderBrowserDialog Tag: 116894
  - 19
    - DataGridView: draw only a border for selected row Hi all, is there a way to highlight a selected row (in a grid that allow only a row selected, or even just a cell at one time), drawing only a thick border around the row (but not between the cells of the same row) instead of the highlight blue background? I couldn't find any way to do it correctly Tag: NullReferenceException from FolderBrowserDialog Tag: 116890
  - 20
    - Windows Virtual memory --minimum? How do I fix this problem ? It keeps poping up once in a while? Read out says that the virtual memory is low Tag: NullReferenceException from FolderBrowserDialog Tag: 116888
  - 21
    - Installation error (GAC) I am using the trial version of MailBee.NET IMAP. I created a program and made a setup package. I installed it on my other vista machine and I get this error: Unable to install or run the application. The application requires that assembly MailBee.NET Version 3.0.2.79 be installed in the Global Assembly Cache (GAC) first. Please contact your sys admin. Any ideas how to fix this? Tag: NullReferenceException from FolderBrowserDialog Tag: 116886
  - 22
    - Remoting Hi, i need to share custom object with remoting. Ideas???? Please. Tag: NullReferenceException from FolderBrowserDialog Tag: 116880
  - 23
    - 80070008, WindowsUpdate_dt000 80070008, WindowsUpdate_dt000. Thats the error im getting when i try to install service pack 1. I have enough memory and all the requierments. I tried troubleshooting the error with their service page. I am getting an error when i try to install my webcam "not enough storage to install this device" and i think the problam has to do with the same prob im getting from trying to install sp1. Any help would help alot, im very stressed over this issue. Tag: NullReferenceException from FolderBrowserDialog Tag: 116879
  - 24
    - Tab control and navigation buttons Hello - I have a tabbed control on a form that is populated from a database. I have a request to change the application to include a navigation button for customers that have multiple records. I have created navigation buttons for use in forms, however, I have never developed them specifically for a tab control. Is it possible to do this? Any help will be greatly appreciated! -- Sheldon Tag: NullReferenceException from FolderBrowserDialog Tag: 116872
  - 25
    - Button stuck disabled when running under VS Debugger Hello all, I'm experiencing a samewhat strange behaviour when running my Windows Forms app from withing Visual Studio 2008. The application is multithreaded and the workerthread fires an event that should enable a button in the GUI. I'm using BeginInvoke to call the method that enables the button on the GUI thread. The code is very straight forward: On the worker thread: [...] ffmpegProcess.WaitForExit(); if (GeneratorFinished != null) { GeneratorFinished(this, null); //event that triggers the button enabler } In the GUI Class: void generator_GeneratorFinished(object sender, EventArgs e) { if (this.InvokeRequired) { MethodInvoker invoker = new MethodInvoker(EnableStartButton); invoker.BeginInvoke(null, null); } else { EnableStartButton(); } } private void EnableStartButton() { btnStart.Enabled = true; } This works as expected when running the program outside of VS. However if I start the Program within VS (by hitting F5) the Button does change its appearance from disabled to enabled but does still not accept mouse input. The button works when I press the accelerator key (Alt+S). I can also tab to the button (it recieves focus) and press enter. However tabbing to it and pressing space doesn't work. Once the button got activated via tab+enter or the accelerator key it 'unsticks' and accepts mouse input again. It's not a big deal but a little annyoing and I'm curious if there's anything I can do to prevent it from happening? Thanks Ben Tag: NullReferenceException from FolderBrowserDialog Tag: 116869

Hi there,

My application, which uses the FolderBrowserDialog, sometimes throws a
NullReferenceException with the following call stack when calling
FolderBrowserDialog.ShowDialog():

at
System.Windows.Forms.UnsafeNativeMethods.Shell32.SHBrowseForFolder(BROWSEINFO
lpbi)
at System.Windows.Forms.FolderBrowserDialog.RunDialog(IntPtr hWndOwner)
at System.Windows.Forms.CommonDialog.ShowDialog(IWin32Window owner)
...

Any ideas what could be causing this?

Thank you!

Top

Re: NullReferenceException from FolderBrowserDialog by Scott

Scott
Tue Apr 22 19:29:05 CDT 2008

It is most likely caused when no file is selected and the OK button is
pressed or when the cancel button is pressed. You must code for these two
possibilities.

-Scott

"ondrej421" <ondrej421@discussions.microsoft.com> wrote in message
news:21C3547F-FE12-41DE-AC89-94EE8C5DAF89@microsoft.com...
> Hi there,
>
> My application, which uses the FolderBrowserDialog, sometimes throws a
> NullReferenceException with the following call stack when calling
> FolderBrowserDialog.ShowDialog():
>
> at
> System.Windows.Forms.UnsafeNativeMethods.Shell32.SHBrowseForFolder(BROWSEINFO
> lpbi)
> at System.Windows.Forms.FolderBrowserDialog.RunDialog(IntPtr hWndOwner)
> at System.Windows.Forms.CommonDialog.ShowDialog(IWin32Window owner)
> ...
>
> Any ideas what could be causing this?
>
> Thank you!

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