Forms :: Form Does Not Open Correctly On Second Instance
Nov 13, 2010
I have a question that I hope to find a much more simpler solution to.I have two forms in my program which are named Main and Second. The Second form has several textboxs, buttons (some disabled) and comboboxes. When the Second form is opened via the Main form on the very first instance, everything works fine.
However, if I re-open the Second form after previously closing it, the disabled buttons are no longer disabled and the text controls and comboboxes show the previous values entered from the first instance which I do not want. How can I ensure that the Second form will be opened "clean" every time.
Currently I have to add instances to the onload event to do this to ensure that the form is cleared on the second instance.textbox1.text = ""textbox2.text = ""textbox3.text = ""button1.enabled = False
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Jan 18, 2012
Form does not open correctly on second instance
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Oct 24, 2008
I'm having a hard time getting this code to work, here's the code, I'm trying to open an instance of explorer.exe in a vb.net panel. Imports System.Runtime.InteropServices
[Code]...
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Aug 24, 2009
I have been working on a quite complex multiform solution.All of a sudden the start up form (in fact any form I designate to start up) loads, displays and operates fine.
But when I try and show a form using showdialog the form displays behind the original form and I can�t set focus to the ide to close it down. I have to use task manager or alt f4 while the form has the focus.
Calling different forms from this one gives the same result but other forms work fine. I don�t want to redo this form as Ive done a lot of work onit.The only thing I can think of that whist I was changing the startup form in the project propertied page (file>project>properties) I unchecked the �Enable applications framework checkbox.
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Apr 26, 2004
I am using the following code to open an MDI form from a parent form...
[Code]...
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Nov 17, 2009
In vb.net, you can address a public variable from another form using the form name along with the variable.
form2.show
form2.k = 3
However, if you use a form variable to show an instance of the form, you must use that variable name to address the public variable. Two instances of the same form are displayed in the following example. The public variable k is assigned a value of 3 only in the first instance of the form, the one from form2.show. frm.k can be used to assign a value to the other form.
dim frm as new form2
form2.show
frm.show
form2.k = 3
Assuming only one instance of the form is shown in the application, is it reliable to address a public variable using the form name (form2.k), or is it better to show the form with a form variable and use that to refer to the instance of the form (frm.k)? Would the same answer apply to a property as well as a public variable?
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Feb 8, 2012
creating single instance form in MDI Application. How to check whether form's instance created or not?
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Apr 20, 2011
When I open my child form,
frm_Analogs.ShowDialog()
It opens up the new form, but now I can not interact with my main form. It will not accept focus or allow me to interact with it.
Do I need to change the form type?
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Nov 27, 2011
I want to open up an existing instance if my program is already running only if its running the same version.I noticed that this question was asked for only if the name exists, but what if the version is older, I just want to notify the user that an older version is still running, "please remove older version before starting this version."The other link is this one:Return to an already open application when a user tries to open a new instance but they don't talk about closing an instance if an older or newer version is detected.
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Feb 21, 2009
how can i do that? first form close and second open........i did that but first is only hiding not close
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Nov 28, 2011
I want to open up an existing instance if my program is already running only if its running the same version. I noticed that this question was asked for only the the name exists, but what if the version is older, I just want to notify the user that an older version is still running, please remove older version before starting this version. The other link is this one: Return to an already open application when a user tries to open a new instance but they don't talk about closing an instance if an older or newer version is detected.
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May 10, 2010
I have two windows forms,say frm1 and frm2. I have to open frm2 from frm1 and frm1 from frm2.when one form opens other hide. But the the problem is that everytime when i open the form new object of the form is created which increase the memory usage of the application.What should be the efficient way to switch from one window form to another in vb.net.
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Jun 8, 2010
I have a form which has has a bound data source (generated automatically by VB - table adapter, binding source etc).How do I use the Form.Show method to open the form ready to enter a new record. Is there a simple way of doing this?
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Aug 23, 2011
I am using MDI forms and I would like when a button is clicked, if the form is already open. it just puts it on top instead of opening the same form again.
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Jun 17, 2010
may i know is that possibleto assign the form a shortcut key like crtl 0 to load/open the form?
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Jun 2, 2010
At one point I have a dialog form open, but in order to process it, the user might want to access information on other (open) forms. This would necessitate the ability to move/resize/scroll the other forms, but obviously everything is frozen during the dialog. I don't suppose it's possible to achieve this "semi-modal" state, where other forms can be browsed, but no other actions taken?
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Sep 6, 2010
I have a small "options" form that when shown, the user submits some changes, clicks a button, and then it fades out. I want the form to open at the mouse location. How would I do that?
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Aug 2, 2009
I have a program that when you set it as the default program for opening rtf files, and open the file, not from the program, but from windows. It doesn't open it at all. It launches my program but, the file doesn't open in my richtext box.
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Jul 27, 2011
I have a situation where I am opening a SaveFileDialog box but it opens underneath my form instead of over it. This is causing my users some confusion. Does anyone know of a way to force that dialog box to be topmost at all times?
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Aug 22, 2008
I have a main form that hides when i open other forms from it. On the child forms i have a menu strip with file:exit and help:about. When i click on file:exit the form closes and the main form opens. using the following:
[CODE]........................
That all works fine. What ineed is to get the same results when a user clicks on the x in the top right corner.
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Dec 15, 2011
wen i open mdi through the login form, the forms inside the mdi child forms dont seem to execute.
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Oct 27, 2011
I have a few forms that have a lot of really intensive updating along with a great deal of user interface (text boxes, button clicking etc) Is it possible to open a separate form as a separate UI thread from the start up form that called it to "show" or open or whatever the new method might be?
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Jan 3, 2012
I have a problem with MDI forms and their location. I have a container form within which I open several child forms. Also note that in the container form I have a ToolStrip at the top and it is also docked to the top. In each of the child forms I have set the following properties. I have set them at design time as well but it wasn't working for some reason so I put them in the form_load event as well.[code]...
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Dec 21, 2011
I've got three forms, one is a search form where you use textboxes to filter the datagridview to find the Client you wish to work on.The second form is basic data entry, their personal details, assets, liabilities, etc is entered on this form.The third form calculates all sorts of reports about the particular client.I filter the binding sources each time to get the appropriate clients data on the form when the particular client is chosen in the first form.When I go to print the word document I create at the button.click event, it comes up with an error saying "Conversion from string "" to type 'Integer' is not valid. I've checked countless times, tabbed in and out of the textbox, named ClientIDTextbox, but it still wont accept that there is a value in that textbox - the error is appearing on the line where I use the textbox to query data from the database using the ID in the textbox.The third form holds the print button, and the second form holds the ClientIDTextbox which is causing this error.
I'm about to try querying the binding source, instead of applying a filter, using ClientBindingSource.DataSource = dt where dt is a datatable. I'll let you know how this goes! But in the meantime, is it because I've filtered the binding source multiple times across forms that the error is appearing?
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Aug 18, 2010
I can have all the projects existing in the same solution, and it builds fine. I can have a reference added to the project that I want to show a form from and still builds fine, every time I do something like this: Dim form_to_show as new Project2.Form1 form_to_show.show() It appears to corrupt the RESX file and stops compiling...it's really getting anoying..
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Aug 5, 2009
Add a new report to a windows forms project. Now add the table data region from the tools. If you don't already have a strongly typed dataset displayed in the data sources view, get that ready. Now do the tried and true easy-to-use trick of dragging a field from data sources onto the table's details row.
[Code]...
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Sep 27, 2009
In a windows forms project, I have several combo boxes. The first combo box contains a list of objects. Those objects then have several lists which are used as the datasource's for the successive combo boxes, depending on which item is chosen in the first.
[Code]...
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Aug 1, 2009
I used to take the word count of many document by using the microsoft com component But the problem is used to open a document and and take wordcount and close it .This process take long time as i have to open a winword and kill the winword for a document .Can any one fine tune my code so that it would make the process much more faster than mine
Public Class WordCount
Dim appWord As Word.Application = New Word.Application
Dim aDoc As Word.Document
[Code].....
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Jun 7, 2011
Actually i am a PHP/Mysql developer.i am newbie to vb.net and i am trying to develop a application which asks for a password when the user tries to open any.exe file
for example:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code].....
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Mar 17, 2009
I have a program that runs some data manipulation on a file when it is double-clicked and then displays this to the user.However, when I double click on the same file type of a different file it opens in a separate instance of my program instead of the same instance already running, i.e. some message that says would you like to reload file, YesNo, and then given the answer perform the action required.I have found some code to stop a second instance from opening, but this is inconvienient for the user to close out of the program everytime they want to view a new file.[code]
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