Variables - Passing Data Between Forms?
Jan 24, 2011
I have a form that has a button, when clicked it pops up a Dialog Form. Within this dialog form the user needs to select some data and when the user is finished they click the OK button. Once they click the OK button it needs to return an integer back to the previous form.I created a Dialog Form and tried calling it via the code below:
Dim intResult as Integer = frmData.ShowDialog()
Debug.Writeline(intResult)
However, it seems I can only return DialogResults (Abort, Cancel, Ignore...)I was wondering how I can try this without having to create a public variable and storing the result there.
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May 17, 2012
I have a Form1, the user types a "Client ID" in a textbox if it's not a valid one, it opens a Form2 in which the user selects the correct "Client ID", once selected he presses an OK button. And there comes the porblem.. it opens a new Form1 with the Client ID that he selected from Form2, but I still have the first Form1 opened.
I have two Form1 opened...
I which to keep the original Form1, but with the value sent from Form2..
I'm using this code:
Code in Form1
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
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Apr 12, 2011
I am working on a program, and I would like to have the program pass a name from on form to another.
This is my code :
form 1 :
Public Class Form1
[code].....
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Sep 2, 2009
I'm having an issue where I need to pass the value in a variable from one sub to anotherHere is the scenario. I have two forms; Main_Form and frmClient. I take a value from frmClient and pass it into a sub called Form_Activate located in Main_Form. I then need to take the value from Form_Activate and use it in a sub called when the user selects a menu item in the toolstrip.Starting point is frmClient and the code there is this:
Private Sub Button1_Click(ByVal sender as System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Client As Integer
[code].....
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Sep 28, 2011
I have a form that holds min two timers, One is a 72 hour timer and one is a 12 hour timer.
What I am trying to do is have both run at the same time, when the 12 hour timer expires it'll bring up a form informing the user that in 60 hours the machine will reboot (or they can just hit reboot). When the 72 hour timer expires it reboots the machine.
BUT I know my managment is going to want to be flexable. e.g instead of 72 hours make is 54, and instead of 12 make it 6.
I wish to avoid using global variables
This is the code for the 12 hour one, How do I call it and set i12sec and i12min?
************************************************
Private Sub t12hTimer_Tick(sender As System.Object, e As System.EventArgs, i12sec As Integer, i12min As Integer) Handles t12hTimer.Tick
t12hTimer.Interval = 1000 '1000 Miliseconds = 1 second
[Code]....
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Feb 8, 2010
Also, I'm sure I explained myself well enough, but just in case I didn't, I've attached a jpg with form/control examples w/code
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Nov 27, 2009
I seem to be running into an issue. This may seem like a noob question (which it really is, I only have experience in vb6 from years ago) but what Im trying to do is pass a variable from one form to another. Ive tried telling the first form to set the value of the variable on the second form like so frmsecond.variable = "value" but that does not work. Ive tried placing a public variable in a module to do it, but again, no luck. The only way seem to be able to get it to work is the second form setting the variable by reading the value from the first form like so [code]The problem I have with that code is what if for some reason the selected line gets changed as the form is loading or something to that nature. It doesnt seem very secure.
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Nov 26, 2011
Quite a few threads on passing data from one form to another, but I'm struggling to work out how to share data between the two - back and forth.
For example:
Class1 is a class with 10 string properties
Form1 has 10 labels ("Label1", "Label2" etc) and a [Configure] button.
Form2 has 10 textboxes and a [Apply] button.
I want to load with Form1, and create an instance of Class1. Click the Configure button and load Form2, passing Class1. On Form2 I want to manually fill in the 10 textboxes and hit Apply. The Apply should update the Class1 instance and close the form.
Form1's Label controls should then be updated with the data from the Class1 instance.
I'm fine creating the forms and classes, as well as passing the class into Form2 with a custom Sub New(EmptyClass as Class1) constructor. This gets the empty class into Form2, but how can I get the populated class back to Form1?
As Form1 already exists I don't want to create a new instance with another custom Sub New(PopulatedClass as Class1)
It's also key to be able to use the Form2 multiple times, basically ending up with a Data class being displayed as part of Form1 but updated using Form2? (For example if the Class has already been created and populated with data when it's passed back to Form2 for the second time I would pre-load the Textboxes with the values already in the class).
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Dec 28, 2009
Passing data between forms without any public methods or properties on the forms. everything but the "Controller" class, which I would like you furnish. I just changed the title from "Intermediate" to "Beginner" This solution is an example of the Observer Pattern. The "Controller" class is the "observed" class, which in this case means it publishes events.
' File Definitions.vb
Public Delegate Sub MessageDelegate(ByVal sender As Object, ByVal e As MessageEventArgs)
Public Class MessageEventArgs : Inherits EventArgs
Public Message As String
[CODE]...
The program should initially display Form1, and Form2. Clicking of the button on either form will modify the Title Text of both forms. I think that you will find the final end result to be pretty neat, as it works with any number of open forms not just two. I think asking for the Controller class is easier than asking for the code in the forms. My solution for Controller class has 7 lines of content, 9 lines if you include Class, EndClass. A minimal solution could achieved with only 4 lines of content, but it would a textbook example of bad programming.
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Sep 27, 2010
I have code, shown below, that works all except for 1 thing: The variables being passed byRef get passed, but once modified in the else section of the "if me.invokerequired" code of RecordData, the variables are never updated in the calling function. To reiterate, the calling function does not receive the updated data that is in the variables custid and amt.When debugging, I see the data change in the else section of "if me.invokerequired", but once it returns from the callback the data is missing.[code]
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Mar 8, 2011
Question 1: What is the difference between "Background Worker" and "Worker Pool" as indicated within the MSDN samples provided.
Question 2: I noticed while using, AddressOf _Function_, variables cannot be passed; what would be an efficient solution to this?
Question 3: While using multithreading is it required to invoke before setting variables, or only form properties?
Question 4: While using System.Net.Sockets is it safe/efficient to use Application.DoEvents while waiting for new data; or would be using a Do While loop be fine without DoEvents since the action would be multithreaded? Note: there can be up to 2000-3000 sockets in use at a time.
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May 10, 2010
I have 2 forms. Using Visual Basic.On Form 1 there is a populated combo box. This was done so by running a query through it and populating it with PUZ_ID values from a data set.On form two there is a tool strip and below is a search query.I need to be able to select the value i want in the combo box on form 1, and launch a button that opens form 2, which has loaded the data that i binded onto the form.Anyone have any ideas/code or need me to clear this up a bit more?So i need to run something through a query, or make something public or what?
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May 10, 2010
I have 2 forms. Using Visual Studio.
On Form 1 there is a populated combo box. This was done so by running a query through it and populating it with PUZ_ID values from a data set.
On form two there is a tool strip and below is a search query.
I need to be able to select the value i want in the combo box on form 1, and launch a button that opens form 2, which has loaded the data that i binded onto the form.
So i need to run something through a query, or make something public or what?
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Oct 20, 2010
I need to pass a double from form1 to form2 and have form2 return this value back. My problem is while i can receive the proper value in form2 i can not seem to get the corrected value back in form1 (using byRef in form1). Here is the code snip
Dim AmountPaid As Double = 8
Dim newInvoiceRow As InvoiceDataSet.InvoiceRow
If (MakeAPayment.ShowDialog(AmountPaid) = Windows.Forms.DialogResult.OK) Then
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Jul 8, 2010
Form1 is a Datagridview which is non editable. I want a user to be able to double click and open Form2, which will allow editing BUTForm2 is a list view and also had a binding navigator so I guess I cannot use dialogue? I do not want to simply just edit in a dialogue and save.Is there an easy way to get the record from Form1 and pass it to the controls in Form2 so that the correct record is displayed?
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Jun 18, 2009
I am trying to pass data between forms on a double click operation. On Form1, I have a simple database with three fields (ProfileID(PK), Profile First, Profile Surname). The database has 10 records at present which displays all records in a datagrid view which is set to read only. I have the Selection Mode set to FullRowSelect to highlight the full row.Form2, is a form to Display one record at a time. This form allows editing and saving of changes.How would I go about coding in vb.net to firstly get the ProfileID from the relevant row and send this into Form2 to display that record for editing?
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Nov 12, 2009
I have a gridview on a form pulling user data. I have also created a basic login system where users login and their username/password is checked against a table in SQL Server 2005.The gridview is on Form 2 but i am having great difficulty in returning the records in the gridview for the user that is currently logged in.
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Dec 15, 2009
Imagine a project with couple of forms and a module. Now as per my knowledge if i want to send some data from one form to another then :
- If I declare variable friend/public in a module then it can be accessed in the entire project (thus also between forms).
- If I just have to send data from one form to another, then I can call the other form's sub/function and pass value.
- If the pass value by reference then I can get new value only if its changed in that function.
Now what the issue is, I need to pass a variable to a form and in that form when user types contents in a textbox or makes other selection and presses OK button then it should return some values back to the calling form. Now how can I achieve this (without declaring global variables which will be accessible everywhere) ?
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Sep 14, 2011
Is it a good practice using global variables in a VB (.NET) application in order to exchange data between forms? As global variable I mean a public variable defined in a module and not a public member or property of a class. Moreover as my personal rule I never access a global variable from a class, but I pass the values to the class via functions.
[Code]...
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May 27, 2009
I have 2 forms in this application. One form is just a simple SQL statement that is generated into a grid. It displays columns/rows. From there I want to be able to click on a row and have the first column of that row transferred to another form. In the second form I want it inputted into a text box. So, the user doesn't have to copy the record back out of the form then open the other form and paste.
The form opening and closing is not the problem. The problem is getting the data to transfer from one form to another!! I am not sure how to do it.. I have only been coding in VB for a few days and no formal training. I am aware of global variables and would be willing to assign the data to a variable and then have it transferred into the textbox of a the second form.
I do not know how global variables work in VB. This is what I got so far............
'The user clicked the transfer button.
Dim obj As System.Data.DataRowView = grid.Current
MsgBox(obj.Item(0), vbInformation, "Selected Data")
[Code] .....
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Jun 10, 2011
I have two forms and I am running a sql query to provide a set of variables in my first form that I need to pass to my second form. Here is the code that I have:[code]to form 2 which then shows the data retrieved from a sql query in the load event to a datagrid view.
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Mar 30, 2010
I have my own little tutorial about passing variables, and if you'll look at the code below, you'll see how I am passing the variable from one sub to the secondsub. Here's my question, how can I pass a value back from the 2nd sub to the 1st? So if I want to sum intA plus intB, and want to return that value to the first sub, how do I do that? [code]
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Apr 21, 2011
I have a program that I am writing that asks the user for information.The program takes that info and passes the strings to a module that has a set of case statements for comparison.The program was working just fine yesterday, and now it acts like there is no information being passed to the module for comparison.[code]
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Jan 21, 2009
I have an ASP.NET 2003 web application. There is a .vb module file within that application. Is there anyway I can pass a session variable into this .vb module from a aspx.vb page?
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Sep 16, 2009
I have an application I have built which is basically a decision matrix. I would like to add it to a current database as a button on the form. When the button is clicked I would like to pass header information to the executable (two variables).
I can modify the code but I am not sure where to begin?
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Apr 27, 2009
I am using Visual Basic 2008 for this assignment. I have a project that I am working on and I need to be able to use form variables across the entire project.
I have looked on other forums but no definitive answers.iI have declared variables as such Public StrV21true As String and "Public StrV21False As String
Now apon assigning a string to the variable with an If Then Else Command, I go to the next form expecting that the assigned variable will be available for use in this second form but to my dismay it tells me that the variable has not been declared and will not even show up in Intellesence. Like I said before from research on the net I am using the public class in Form 1 to hold the variables and am kind of expecting the public class variables to be available through all the forms in the project. I would really like to know how to do this so as I can finish my project for class.
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Feb 8, 2012
I'm having trouble passing Variable information through classes, here is what I mean.
Example:
On my Form I call on Test.Result
Test is my Class
[code].....
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Nov 19, 2010
I have two forms and I'm trying to pass a declared variable from form1 to form2 and then pass that variable in a sql query that I have in a dataset that is bound to my form. I know that my query works but it's not producing any data. I have debugged my form and can see the data being passed in the variables elsewhere on the page but I'm not sure of the syntax within the query.
[Code]...
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Jan 24, 2012
I am getting an "Automation Error" with the following:
Dim sheetdate As String
Dim sheetdate1 As String
sheetdate = "7/1/2011 23:59:0"
[code]....
I need to pass two variables to the WHERE clause. If I manually input 'sheetdate' and 'sheetdate1' into the clause -
WHERE (((ticketorders.TimeStamp)>#7/1/2011 23:59:0# AND (ticketorders.TimeStamp),#7/2/2011 23:59:0# ...
everything works fine. The problem is I have multiple sheets and I would rather not have to add the entire sub-routine to each and every sheet. My thought is, it would be easier to create a PUBLIC sub and pass the time values (sheetdate and sheetdate1) to the WHERE clause.
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May 21, 2009
I've got a form in my MDI container. Lets call it Form1. I now want to show a dialog box (Form2) and pass the primary key from Form1 to Form2. Do i create a public function on Form2 called SetMe() or Do I create a public on Form1 And read from it? From a best Practice point of view, How would you go about it?
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