Variable With A Value Detects As Nothing?
Jun 12, 2009
In a WPF application I have specified a class variable with an associated property that will automatically initialise the variable the first time is it accessed.
However after all the values that will be put into it have been added, and the window opens, the if statement that is supposed to check to see if the variable needs initialising appears to get bypassed, and the variable is re-initialised, thus deleting the information that was in there.
Private Shared _types As Specialized.HybridDictionary
Private Const _typesLocker As String = "blah"
Public Shared ReadOnly Property types() As Specialized.HybridDictionary
[Code].....
View 8 Replies
ADVERTISEMENT
Feb 26, 2011
Im working with my project. I have a device called PIR (Passive Infrared Resistor), capable of detecting any kinds of movement. When the device reached the maximum limit of movementthe red light will turn on. The output of my device is -5v. I want my program to respond when my device detects movement
View 2 Replies
Dec 2, 2011
I have a small network of PCs and I want build an application in order to manage a database. Every user will have his own instalation on his PC. How can I make those aplication to detect the computers in the network, and to detect and interact with the program installed on the other PCs (update records from the instances installed on other computers, add new records to the database from the other computer etc). Where do I start? Is there any book that specifies that?
View 5 Replies
Sep 18, 2009
I want to create a event handler that detects a Directory created/deleted event. is it possible to do using a FileSystemWatcher?
View 2 Replies
May 26, 2012
I'm trying to make a button that, when pressed, activates a function that detects mouse left click this way: whenever I left-click, it sends key 3 and then 1 (keyboard).
View 8 Replies
Feb 10, 2011
I'm trying to make a simple program that detects if a game closes, and when it does, it shuts down the computer.
View 1 Replies
Jun 15, 2012
I'm currently having some trouble getting an If statement to work. I want the statement to do its thing when it detects a form is not open. this might sound a bit confusing this is what i mean:
If Form2.open = false Then
blah blah blah
blah blah blah
blah blah blah
[CODE]...
Basically i dont know if im able to have an IF statement occur for when a form is not open and i dont know how to word it.
View 3 Replies
Nov 21, 2010
I want to make a program that detects the note that is being played in front of the microphone. I am testing the FFT function of Naudio, but with the tests that I did in audacity it seems that FFT does not detect the pitch correctly. I played an C5, but the highest pick was at E7.I changed the first dropdown box in the frequency analysis window to "enchanced autocorrelation" and after that the highest pick was at C5.
View 3 Replies
Aug 21, 2010
I'm trying to write a program that detects the contents inside a textbox, and if empty displays a warning, and does not input anything into a rich text box. However, if something is detected, it would not display the warning and input the textbox's text into the rtb.
I got everything else, just need help with the textbox detection code.
View 3 Replies
Mar 18, 2009
I have a vb.net windows application that i am using, i have embedded a shockwave flash file in one of the forms, in the development enviornment everything works fine. Then I am using the setup and deployment to create a "msi" it automatically detects that the shockwave flash is a dependency for my project and adds the required dll.Once it has created the msi, and i run it on a new machine, the software gets installed, but the flash component inside the form dosent work. is there something special i need to do for that dll?
View 1 Replies
Dec 9, 2011
I have to create a block of code that detects the Local IP address of connected adapter and returns it as string to a TextBox.
View 7 Replies
Mar 25, 2010
I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient
Imports System.Linq
Public Class Form1
[code]....
I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
View 2 Replies
Aug 23, 2011
I receive the error -
[Code]...
View 10 Replies
May 18, 2012
Public Class Form1
Dim x, c, number(0 To 19) As Integer
Dim s As Integer
[CODE]...
The variables in the brackets [example] do not actually have brackets in them in the original code. These are where the issues are. For both variables, it says, "The type for variable [variable] will not be inferred because it is bound to a field in an enclosing scope. Either change the name of [variable], or use the fully qualified name (for example, 'Me.[variable]' or 'MyBase.[variable]')." Now, I'm not entirely sure if this is a stupid question or not, as I'm used to VB '98 because that's what we use in my programming class at High School. let me know why this won't work.
-Note: The intention of this program is to continually loop the generation of numbers for this list until I tell it to stop. Button1 ends the program, Button2 generates the list one time only, Button3 is supposed to loop the generation of the list, and Button4 is supposed to end the loop, but not the program.
View 9 Replies
Jan 10, 2011
Say that i have the following code that parse about 20k records from the DB.
Code #1
vb.net While reader.Read()
list.Add(If(Integer.TryParse(reader(0).ToString, 0), Integer.Parse(reader(0).ToString), 0))
End While
And then another code which does the very same thing but it seems to be a little cleaner.
Code #2
vb.net While reader.Read()
Dim storeowner As Integer = 0
Integer.TryParse(reader(0).ToString, storeowner)
list.Add(storeowner)
End While
This is what i am confused about; does the compiler creates a new variable automatically when i use the if statement without strictly declared variable? What approach is better in sense of performance?
View 2 Replies
Aug 24, 2009
I am looking for a good resource on variable naming conventions to illustrate variable type and where variables are declared. So I will have public variables, Private variables, private or local variables. I also may want to declare variables with the same name in different class code (i.e. in the code behind different forms). I am assuming good coding would dicatate a prefix for declaration location.
View 4 Replies
Mar 28, 2011
i have this error in the line of with xl.active......Object variable or With block variable not set.
Dim xl As Object
xl = CreateObject("Excel.Application")
With xl.ActiveSheet.QueryTables.Add(Connection:= _
"TEXT;C:Documents and SettingsUserDesktop429MEDICA2.TXT", _ Destination:=xl.Range("$A$1"))
[code]....
View 4 Replies
May 31, 2012
Now I have the need to get a current value from a bindingsource in a property of a user control.In a previous thread I had tracked down the "Object variable or With block variable not set" to the return in the Get block of a property. At the time I was only using the Set so I just commented out the offending code until I needed it.
[Code]...
The error does not occur during a system compile, only upon saving the container object of the user control. As I said the Set works correctly, only the Get causes the error.I would like to know what I am missing/misunderstanding and am open to other suggestions of handling retrieving the current value of a bindingsource in a user control.
View 2 Replies
Sep 5, 2010
Using Visual Basic 2008 Express. I need to pass a variable to another form. Or else make the variable visible to both forms.
View 4 Replies
May 14, 2010
I am using vb2008.net express,I test vs2005term it work, can any tell me what is the input variable and output variable of this terminal?how to catch the input and output variable to a textbox1 for sending and a textbox2 for receiving when I press send button? is that possible?
View 1 Replies
Sep 17, 2011
I have the following code that I am using to parse out a test file. I am getting variable conversion error in Sub Main() when I assign file = Read(). The return value of Read() is a TextFieldParser type. How do I assign the proper variable type to "file" so I can write the output to a text file?
Function Read()
Using MyReader As New FileIO.TextFieldParser("C:UsersColinDesktopParse_Me.txt")
Dim currentRow As String
[Code].....
View 3 Replies
Mar 19, 2009
I have the following code but I get blue squiggly line in cnn and when i point my mouse pointer on it i see this message "Variable 'cnn' hides a variable in an enclosing block"
Private Sub BtnLockUnlock_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnLockUnlock.Click
Dim IsLocked As Boolean = FpSpread1.ActiveSheet.DefaultStyle.Locked
[code].....
View 3 Replies
Feb 1, 2012
I have the following code passing a dataView variable to a function and I am getting the following warning:"Variable 'cl' is passed by reference before it has been assigned a value. A null reference exception could result at runtime."
Function Editclass()
Dim cl As DataView
Bindclass (SqlConnection2, cl)
[code].....
View 1 Replies
Sep 26, 2011
i had a class called Tag with a structure like:
public class Tag
private _members
public properties
public shared database_methods
end class
this class was tailored for mysql database. i'm currently adding access 2007 support so i split tag into tag and tagdata with structures like:
[Code]...
View 2 Replies
Apr 25, 2012
I'm having trouble tracking down what is wrong and causing the above error. This only occurs when saving the design view in VS 2012. The code builds and runs fine.Full error text:Code generation for property 'CompanyValue' failed. Error was: 'Property accessor 'CompanyValue' on object 'ContactViewUC1' threw the following exception: 'Object variable or With block variable not set."
CompanyValue definition in ContactViewUC:
Public Property CompanyValue
Get
[code].....
View 6 Replies
Jul 24, 2008
Been getting this error with my program. Using framework 2.0
[Code]...
View 1 Replies
Jan 21, 2010
I'm trying to enter automatically todays date in a number of records in the Table 'Applications' into the field 'Date_refund_request'.
However it is giving me the error 'object variable or withblock variable not set' in the line "Set rs = db.OpenRecordset(strSQL, dbOpenDynaset)".
The code is as follows:
Private Sub Command16_Click()
On Error GoTo Err_Command16_Click
Dim db As DAO.Database
[Code].....
View 1 Replies
May 6, 2009
I am trying to use this block of code to save attachemnts from Outlook into a folder on my harddrive.
VB
Imports Microsoft.Office.Interop
''' <summary>
[code].....
View 2 Replies
Jul 9, 2009
I have the following code but I get blue squiggly line in cnn and when i point my mouse pointer on it i see this message "Variable 'cnn' hides a variable in an enclosing block".[code]
View 2 Replies
Jun 2, 2011
Say I have something like this
Dim Level1 as Integer = 83
Dim Goal as String
Goal = InputBox(" What level is your goal?")
[code].....
View 7 Replies
