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
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
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?
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).
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.
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.
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.
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?
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.
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.
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?
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.
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"))
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.
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?
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
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
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)
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
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]
