VS 2010 Working With Boolean Variables?
Jun 16, 2011
I am working with a multi form project. The long and short of it is that when i originally load form 1 ... all bool variables are false. Once i load form 2 and perform my operations some of my bool variables will be set to true.
I need to have some sort of object to listen for those changes. What i have come up with so far is the following. Private Sub patient_frm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]...
The if statement will work but i need a way to make it keep looking for changes in the boolean variables.
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Jan 16, 2012
I have 8 boolean variables and i need to be able to add an email to an email string for each boolean that is true. I dont't know how to do it without writing a million if statements. Here is some of what i have:
if bIsBlue then
strEmailTo = strSalesEmail
strEmailTo = strEmailTo & ", " & varBlueGrp
End if
[Code].....
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Mar 23, 2009
This is in VB6 (may also apply to VB.net) CheckBoxes can have three states (Checked, Unchecked, Greyed).
But I'm using them to set boolean variables (MuteSound, etc.) This is definitely a value that has only two states. Unfortunately, the Checked and Unchecked don't correspond to a True/False value.
So, I can't have:
[Code]...
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Jan 14, 2011
I am querying the MS Access Database to display the results in a datagridview. This is my
Dim ConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=data.mdb"
Dim SQLString As String = "SELECT * FROM Groups where Selected = Yes"
Dim OleDBConn1 As System.Data.OleDb.OleDbConnection = New System.Data.OleDb.OleDbConnection(ConnString)
[code]....
The variable Selected from the query statement ("SELECT * FROM Groups where Selected = Yes") is a Boolean in the MS Access Database. However, this statement returns empty result even though most of the values for Selected are Yes. In the access database however, if I enter a 'Yes' for the value of Selected, it shows up as -1 and 'No' shows up as 0. So I even tried changing the query statement to ("SELECT * FROM Groups where Selected = -1") and also ("SELECT * FROM Groups where Selected = 'Yes'") but none of them work. Can you please help me fixing this query because I can't change the database?Also if I change the query statement to ("SELECT * FROM Groups"), then all the data shows in the datagridview, however, the values for Selected column do not display. Instead I see check boxes and I can't click them. How can I display the values correctly?
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Feb 1, 2011
I am using MySQL 5.5 and i linked it with my ASP.net Application . i added a dataset to link my application within the MySQL stored procedure !!! the problem is when i call any stored procedure which contains BOOLEAN like this one :
[Code]...
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Nov 17, 2009
From what I read it is a good convention to name a method that returns a boolean value with the prefix of "is" or "has". So in keeping with this convention I am trying to name a method in my program with this prefix but I am running Specifically I have a class called Day. It is a simple class with a few data members and one method that returns a boolean value of true or false. The name of the boolean variable is isSpecialDay. This class has a method called isSpecialDay which takes the date of the day, applies some criteria to the date and then sets the variable isSpecialDay to true or false. My problem is that the boolean variable is named isSpecialDay and so it the method. What should I do?
Public Class Day
Private TheDate as String
Private DayName as String
[code].....
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Mar 14, 2011
The issue at hand is this. I want VB.Net code to be able to talk with Javascript code, specifically, passing variable values back and forth.A web page contains several DIV elements that actually can open and close kinda like a dropdownlist in it's functionality (there are 8 of these). Initially, when the page loads, these DIV's are closed. However, when a user opens a DIV or multiple DIV's, their are various textbox controls they can make changes to. When any changes are made, they click the submit button to save the changes. Then, when the page reloads, I want the program to remember which DIVs were open so after the page finishes loading, those DIVs that had changes made to them will be opened instead of closed. What would be the best way to handle this. Should it be done all in the code-behind file or javascript alone or both?
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Apr 21, 2010
There are a lot of interesting methods buried in VB.NET, and I'd hate to miss the one that "flips" a Boolean value.
What I'd like to do is something like:
Dim MyBool As Boolean = False
If <true statement> Then MyBool.FlipValue
Of course no method like that seems to exist in the Boolean type itself, but maybe there's another single-statement method that will accomplish the same thing.
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Feb 3, 2011
I just found an error in the compiler. Newpath is a boolean and the compiler took and ran this[code....
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Apr 1, 2011
i have problem when save boolean value to database. this my code vb.net
if bAdd then scmd.CommandText = "insert into products(prod_id,status) values(@prod_id,@status)"else scmd.CommandText = "update products set status=@status where prod_id=@prod_id"end if scmd.Parameters.Add(New OleDbParameter("@status", CBool(chkStatus.Checked))) scmd.Connection = dbConnDim iResult As Integer = scmd.ExecuteNonQuery
i get problem when execute query at line
scmd.ExecuteNonQuery
Data type mismatch in criteria expression
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Sep 19, 2011
What is a Boolean and what does it do in Visual Basic 2010?
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May 24, 2012
I have a checkbox named chkFactureren.When I want to save the value of that checkbox to my ms access 2003 DB I get the error: oledbexception was unhandled by user code - data type mismatch in criteria expression
cmdUpdate.Parameters.AddWithValue("@Factureren", CBool(Me.chkFactureren.Checked))
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Aug 19, 2011
Is there anyway to customize a variable to use both an integer and a boolean value?For example. I am kind of making a simulation engine and using GDI as a visual aid, I am generating a grid of tiles for objects to be displayed, but I do NOT want to repaint all the tiles just the ones that have changed, so that I can save fps.So I thought if I could set a variable for the "tile number", "how many objects there are on a tile", and a boolean value for whether or not the tile needs repainted.[code]
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Nov 15, 2010
I have written a calculator program, and when the mouse clicks on the equals button, the button sets a boolean varaible to true, and then that variable can be used later.But I am wondering if the button control has it's own property that can indicate if it has been pressed?
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Oct 27, 2011
After Filling a DataTable in GridView's DataSource . A column with check box Type appears but it created as read only column and I can't enable it or make it editable... even i tried .readonly = false and still can't be edited
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Sep 21, 2011
I have a HTTP class that gets content from URL's, POST's content to URL's etc and then returns the raw HTML content.In the function inside of the class it detects if there is a HTTP error and if so I would like to return false but will this work if I have declared the function to return a String?
Code Sample of what I am trying to do (Note the Return Content & Return False if a HTTP error code is detected)Public Function Get_URL(ByVal URL As String) As String
[Code]...
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Mar 5, 2010
I ran some code through an automatic translator for C# to VB, and it translated some code like this:Public Property Title As [String]How is this different to Public Property Title As String
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Oct 26, 2009
Is it possible to add the tips to your code in the sub so the user know what part of the sub is for? Like if I create a sub like this:
Private Sub Stuff(ByVal Tip as String)
End Sub
When the yellow box comes up you might see something like:
Quote:
Private Sub Stuff(Byval Tip as string)
This is just some text you use in the sub, don't worry about it.
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Jan 29, 2011
I would like to set stringa and stringb to be equal and then clear stringa like so:
Dim stringa as String = "abc"
Dim stringb as String
stringb = stringa
[Code]....
However this code sets up a link between the 2 variables, so when I clear stringa stringb is also cleared.
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Feb 13, 2012
I have already made my GUI with multiple forms using VB2010 and made buttons that would open and close them (me.hide and form#.show)My problem is how could I use a variable I've computed and displayed on a sub-total (cashier of sorts) to be used on the main form where it would display the bill on a listbox?Here's how the button works to compute for the item sub total
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cstotal As Integer
[code].....
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Nov 19, 2010
What is the cleanest way to assign a value to multiple variables? For example, how can I assign FALSE to each of Label1.Visible, Label2.Visible, Label3.Visible, Label4.Visible, and Label5.Visible.Is there anything like
code
Label1, Label2, _
Label3, Label4, _
[code]....
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Dec 27, 2010
Still working on that overlay. I am stumped on what I think is my last function. I have a + and a - button that needs to control a text box that has numbers in it. For instance: TextBox1 shows the number 2 in it. When I click the + button I want it to increase that number by 1. It sounds too simple when I say this out loud, but I think I am stumped with this basic function. I don't know where to begin.
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Feb 7, 2012
I have the following structure:
Public Structure objKeys
Friend Shared [rsaPrivateKey] As String
Friend Shared [rsaPublicKey] As String
[Code]....
How can I check if these two variables have the same data?
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Apr 5, 2011
I have been using VB a fair bit in the past developing a Access Database, recently I wanted to give my front end interface a bit more power so I have started learning VS 2010.
Anyways, I am still using Access for my databases and i am having a bit of trouble working with the data in VS 2010, what i would like is the following:
A way to form a string or integer from a SQL query (from a single field or multiple on that row) assuming the query will always return one row.
Then a way to write string or integer variables back in to db fields.
example:
Dim cn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|ItemRegisterDB.mdb")
Dim cmd As New OleDb.OleDbCommand With {.Connection = cn, .CommandText = "select * from tblItemregister where ItemID = 1"}
[Code]....
Example = ??? 'What would i need here to copy fields from that row to string?
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Apr 26, 2011
I added queries to my dataset via the designer. Is there a way to use variables in those queries?
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Apr 2, 2011
I have declared a variable for all the controls of my form (Dim result As String) and when i close the form (me.close()) and open it again, the value of the result var don't go to nothing (""). Why is that happening? Close is actually the unload of the form. Shouldn't it delete all the information of the variables?
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Feb 26, 2011
I have a script where I make separate routines with identical code
Example:
sub AddToA {
ATotal += 1
}
sub AddToB {
BTotal += 1
[Code]...
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Mar 30, 2011
I have a MDI application and a very complicated class there which populates its properties from a dataset derived from an external database. Each form, including child forms have to be able to access that class and use its properties thorughout the whole session.I don't know where to 'preserve' these property values within the application. I kmow many books etc. suggest not to use public variables but I really can't find a way to solve this other than to use a public variable (which is a list(of my custom class) in this case.
I have a separate class called PublicItems.vb and declared there my public variable as
Public Shared secuniverse As List(Of myCustomClass)Is there something wrong with the syntax because if I try to use the variable secuniverse in my main application class, I get the following exception:'sectoruniverse' is not declared. It may be inaccessible due to its protection level.
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Mar 12, 2012
So I am currently attempting to wrap my head around create multi-threaded programs and I am currently running into an issue when using a Shared variable across multiple threads.The program is structured as follows: Public Shared IsActive as Boolean
Main Thread = GUISets the Value of IsActive through a Button ControlTwo Worker ThreadsBoth threads are while loops that read the IsActive Boolean Ex:While IsActive = True Do Work End WhileHowever when I change the value of IsActive from the Main Thread it causes the worker threads to stop (ThreadState = 16).
I have been reading that I have to synchronize/lock shared resources and have tried SyncLock and Monitor methods without success (it is entirely possible I am not using the above correctly, so If someone could provide proper examples for the above situation using the mentioned methods please share them).
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Sep 19, 2011
I have created a structure with some variables that I'm trying to update during the course of a sub routine but they are not updating, when I cycle though them at the end all the variables are still set to 0.
Imports System.Data
Imports System.Collections
Structure Team
[code]....
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