VS 2010 Parameterized Multithreading Won't Accept More Than One Parameter
Jul 30, 2011I'm trying to execute a sub with multiple parameters on a separate thread, but I just can't get it to work, Here's my code
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Sql - Parameterized Query Expects The Parameter Which Was Not Supplied?
Oct 5, 2010im having a problem with my code Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
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once i typed in the string in the textbox to search for an item i get this error The parameterized query '(@Parameter1 nvarchar(4000))SELECT * FROM borrow where (Departme' expects the parameter '@Parameter1', which was not supplied.""
Error: Parameterized Query Expects A Parameter Which Was Not Supplied?
Mar 24, 2012I'm getting the error: The parameterized query(@CustomerID, @ProductCode, @DateOpened) expects the parameter @ProductCode, which was not supplied.For one thing, my INSERT query has five parameters, not just the three listed in the error notice.
Another thing, I supplied @ProductCode in the AddWithValue statement.
Another thing is that I don't get the error when I change:
InsertCommand.Parameters.AddWithValue("@DateOpened", Date.Today.Date)
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Make The Function Accept DBNull As A Parameter?
Apr 23, 2012I've got a little function that just changes empty and null strings to "null":
Public Function CatchString(ByVal stringValue As String) As String
If stringValue = "" Or stringValue Is Nothing Or stringValue Is DBNull.Value Then
Return "null"[code].....
I added the bit about DBNull because sometimes it gets null values from a database. This doesn't work, though, because it won't take DBNull as a parameter.I tried changing the stringValue parameter from a string to an object, but then the If statement gives this error:
Quote: Object reference not set to an instance of an object.How do I make the function accept DBNull as a parameter?
VS 2010 - Automated Insert SQL Query Parameterized?
Jul 13, 2011I wrote this little function to allow me to pass an ArrayList of Strings and then based on the table passed to pre-build a SQLCommand like so
INSERT INTO table` (`column`,`column`) VALUES (`value1`,`value2`);
The function for this is here:
Public Function _SQLInsertBuilder(ByVal values As ArrayList, ByVal Table As String) As String
Dim commandString As String
Dim columns As ArrayList = GetTables(Table)
commandString = "INSERT INTO `" & Table & "` ("
For Each column As String In columns
[Code] .....
Now I know that much like mysql_real_escape_string() VB.NET has a Parameter ability to make querys safer. How could I parameterize the values during the build of the string.
Gets A String (mysub(string)), But AddressOf Doesn't Accept A Parameter Inside The Routine?
Aug 18, 2011I have buttons generated through code (dynamically). I have to associate an event (the same) to them. I use AddHandler button.click, AddressOf mysub.The issue is that mysub gets a string (mysub(string)), but AddressOf doesn't accept a parameter inside the routine. How can I do this? Using also an alternative to AddressOf.
EDIT:
Public Class Form1
...
Private Sub mysub(ByVal sender As Object, ByVal e As System.EventArgs, ByVal str As String)[code]......
VS 2010 Multithreading With WIA
May 11, 2010I'm using the WIA Aut. Library [URL] , trying to capture photos from 5 digital cameras (Nikon D90) USB-connected to my pc. Now, I partially achieved my goal, what I do is:
- loop through the attached devices, connecting to every camera;
- fotocamera.ExecuteCommand (WIA.CommandID.wiaCommandTakePicture) ;
- other image processing operations...
Everything works fine but... the workflow is camera1 -> connect -> grab pic. => camera 2 -> connect -> grab pic. => camera 3.....
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VS 2010 Another Multithreading - Seems To Still Freeze A Bit
Feb 9, 2011I just put a button and a textbox on a form to try and learn to multi thread, i think i've done it correctly. but it still appears to freeze for a little bit just before it attempts to display the data. i think it's the invoking. Is it normal / have a done something wrong?
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VS 2010 Multithreading In Console App?
Jun 10, 2011Sub Main() Try'process i files on their own thread
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I'm running into a problem when I stop the debugger, the console window stays open, and I can't kill it via task manager.
VS 2010 Multithreading Weirdness...
Apr 14, 2010explain to me why the 1st example gives me an error complaining about cross thread yada yada....but the second doesn't, and works? this is inside a worker thread function
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I understand the concept of needing delegates and all that jazz when working with multiple threads, but why give me an error if there's no invoke required anyway?
VS 2010 TcpListener Accept Multi-connetions?
Dec 19, 2010i made a simple tcp listener server.Now I can use my client to connect,it connets, everything is good. The
problem is when I open the first client, then I open another one, it doesn't connect. It accepts only 1.Any way I can accept multi connections?
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VB 2010 - Multithreading - Missing Some Data That Is Streaming
Nov 24, 2010I am developing a software that catches streaming data. Unfortunately, there is no pattern or sequence on how this data comes in. So what I have initially done is to catch then write to my MS Access DB. Unfortunately, while writing to the DB, I am missing some data that is streaming since writing takes a little bit of time before it goes back to the catching syntax.
I am planning to multithread the DB writing then just call it from my main program. Do guys know any website/tutorial where I can learn the basics for multithreading? I am using Visual Studio 2010. Or if ever, does any one of you have a sample program where I can just learn from?
VS 2010 : Multithreading And Accessing Other Routines/form Properties?
Mar 1, 2011I'm writing a really simple file updater which downloads files off from a website and saves them. The download routine is working well, except that it freezes the project while attempting to connect to the host. Easily solved with threading except now when I try to access other form items such as text boxes, labels, form caption, it says I am not doing it in a safe manner and prompts an interrupt in debug. I did some reading on it and I'm still not sure what to do, I'm very new to vbnet and it is still a little confusing to me.
Error: Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.
Imports System.Threading
Imports System.Net
Imports System.IO
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VS 2010 Like To Make A Module For Common Multithreading Functions?
Feb 24, 2012I've got 4 projects all running very similar multi-threading HTTPListener stuff.I wanted to make these functions common - in some module - but I'm having a hard time getting the AddressOf the "callback" passed in.This was the code in one of the 4 projects
Private Sub StartRequests(ByVal prefixes() As String)
If Not System.Net.HttpListener.IsSupported Then
DisplayInfo( _
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VS 2010 Multithreading Cross-thread Operation Error
Oct 30, 2011The error occurs at: For i As Integer = 0 To txt_load.Lines.Count - 1..The project exists of 2 rtb's. One with a list of lines. The other will be filled with the converted lines. The main reason that I use it is that I want to use the app during the conversion. The second is that I want to learn how this works.[code]
View 9 RepliesVS 2010 Multithreading, Putting Class Method On New Thread?
Jun 4, 2011Right now I have a Email class that has all the properties of an email to send it, and then a SendEmail function which takes those properties and uses them in the following
Public Function SendEmail()
'Exception handling
Try
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The loop goes through each email in the array to process its email, however with the multithreaded function I cannot call
"EmailArray(i).ThreadSendBatchEmail()"
So how do I call an objects method when its on a different thread?
And I'm making it multithreaded so I can easily pause the process, and because the program freezes when the send() function is working, this would resolve that.
Accept Only File Word And Pdf File And Other To Accept Only Images
Jun 2, 2011One to accept only file word and pdf file and the other to accept only images(.jg|.bmp|.png|.gif)
View 1 RepliesVS 2010 REGEX - Fails To Accept Trackbar1.value As "replacement As String"
May 20, 2012I'm using Regex.Replace function. It fails to accept trackbar1.value as "replacement as string". This code returns "Reference to a non-shared member requires an object reference." error:
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.net - Parameterized Query As String
Nov 15, 2010In my project I need to log all queries executed against my database. As an example we can use the staff user data here. In that class I have a function generating the command with the parameters as follows:
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Getting An Error With Parameterized ADO Query?
Dec 17, 2010[Code]...
What am I doing wrong? BTW, I know nchar(10) is not a good choice for first and last name.
How To Create Parameterized Queries
Dec 4, 2009Using parameterized queries with ms access 2003 integration. To search any data according to different criteria.
View 2 RepliesMicrosoft - How To Use Parameterized Queries
Dec 5, 2009How to use parameterized queries in vb.net? Because I always wanted to make a program that could read an ms access database and display results based on your query.
View 1 RepliesSQL - Parameterized Query Not Working
Apr 15, 2012statement = "SELECT OrderID, (SELECT VendName FROM Vendors WHERE Vendors.VendorID = Orders.VendorID) " &
",OrderDt, RcvdDt, OrderTotal " &
"FROM Orders " &
"WHERE VendName=? " &
"ORDER BY OrderDt DESC"
Dim cmd As New OleDbCommand(statement, connection)
cmd.Parameters.AddWithValue("VendName", txtVendorFilter.Text)
Dim reader As OleDbDataReader = cmd.ExecuteReader(CommandBehavior.Default)
I was trying to do this before by simply concatenating the textbox value right into the SQL and I was getting a "No values given for required parameters", and read that that I should use parameterized queries instead. So I tried this and it doesn't give me any errors, but the reader never has anything in it. I've never used parameterized queries before, so I'm a bit lost as to why this isn't working. I've changed the above code to account for OLEDB from what I briefly read on how it should work, and it's giving me the "no values given for required parameters" again.
The Parameterized Query Which Was Not Supplied?
Jul 21, 2011I keep getting this error :
The parameterized query '(@AdminEmail nvarchar(4000),@AdminPassword
nvarchar(4000))SELECT' expects the parameter '@AdminEmail', which was
not supplied.
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VS 2010 Way To Make Like 'admin' Form Where New Account Applies Will Pop-up When 'admin' Log In And Then Either Accept / Reject New Users?
Oct 10, 2010i have a script with a login form that creates a folder per user with username.txt, password.txt, firstname.txt, and lastname.txt. - auto creates when creating new user.after i log in and change form i want an label showing the first and last name of the person logged in,how am i supposed to do that? is there any way to make like an "admin" form where new account applies will pop-up when "admin" log in and then either accept or reject new users?
View 8 RepliesDifference Between Parameterized Property And Function?
Mar 15, 2012I am coming from the C# world to VB.NET and this puzzles me. Why are there 2 ways of doing the same thing? or is there some difference I am not aware of? What is the difference between the following:
Public ReadOnly Property Test(ByVal v as String) As Integer
Get
Return SomeOperationOn(v)
End Get
End Property
And
Public Function Test(ByVal v as String) As Integer
Return SomeOperationOn(v)
End Function
When do you use one as opposed to the other?
FAQ: Make A Parameterized Query In The Database?
Apr 11, 2009How do I make a parameterized query in the database with VB.NET? remember to mark the replies Welcome to the All-In-One Code Framework! If you have any feedback,
View 1 RepliesLinq Join On Parameterized Distinct Key?
Sep 9, 2010I'm trying to LINQ two tables based on a dynamic key. User can change key via a combo box. Key may be money, string, double, int, etc. Currently I'm getting the data just fine, but without filtering out the doubles. I can filter the double in VB, but it's slooooow. I'd like to do it in the LINQ query right out of the gate.
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"Range variable name can be inferred only from a simple or qualified name with no arguments."
Parameterized Query And Special Chars
Nov 8, 2010I solved this issue in this thread but there still are issues with special chars. ie 'I thought by doing parameters that it would take care of any special chars for you. Well i am still getting mysql exceptions about syntax. I look at the string it is working with and it has a "'" in it.Why are they not working as I expect them to?
View 7 RepliesVS 2005 Parameterized Query Update?
May 15, 2009As you may have seen in my other post, I have to switch over an all text SQL statement based database interaction program to using parameterized queries instead.I remember doing it this way in college but I don't seem to be able to recall one part of it. The program I wrote back then and some code samples here both point to doing the code as I did so far:
m_strSQL = "UPDATE [OWNER DATA] SET [FIRST NAME] = @strFName"
m_strSQL &= ",[LAST NAME] = @strLName"
Dim upCMD As New OleDb.OleDbCommand(m_strSQL, m_Connection)
upCMD.Parameters.Add("@strFName", OleDb.OleDbType.Char, 30, "[First Name]")
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it ran the SQL statement and that's that. Can I just do that with a parameterized query too without using the adapter.update()? And for bonus points, why the heck did I use that command in my old college program cuz I sure don't know?