Prevent Duplicate Upon Keypress
Sep 3, 2010I have a form with 4 textboxes. How would I prevent the user from entering a duplicate value upon keypress?
View 8 Replies
ADVERTISEMENT
Prevent A Keypress In Another Application?
Mar 17, 2011We have 2 apps that we display at once for data entry. 1 taking up the left side of the screen, and 1 taking up the right side.
1 of those apps is the data entry application. The other app is for viewing scanned info. But they can't talk to each other directly.
So I'm creating a tool that runs in the background to intercept certain keys.
I want to be able to capture keys such of Ctrl + Home, Ctrl + Page Up, etc from the data entry application, and send it to the scanned image to rotate it or zoom, etc.
I believe I can do most of it, except 1 part.
Right now if I did Ctrl + PageUp, it will send the key press to both apps. How do I prevent a keypress from the originating application?
Prevent Duplicate Entries In SQL?
Feb 10, 2012How do I prevent a duplicate entry from a text field by using SQL Query?
View 3 RepliesVS 2005 Prevent Index Change In List Box On Keypress
Apr 16, 2010I'm having a problem with my listbox control. I am trying to handle all the keypress events for the listbox and changing the index to the item I want as they type. But the problem is the listbox changes the index to the last key they hit. Here is what's going on.
[Code]...
C# - Prevent A Duplicate Insert After Refresh?
Nov 3, 2009Is there an easier way to prevent a duplicate insert after refresh? The way I do it now is to select everything with the all fields except ID as parameters; if a record exists i don't insert. Is there a way to possible detect refresh?
View 8 RepliesPrevent Duplicate Record Entry?
Aug 2, 2010How Can i prevent duplicate record entry in vb.net.
View 3 RepliesForms :: Prevent Duplicate RECORDS Datagridview?
Feb 7, 2009how to prevent duplicate RECORDS in datagridview cell vb.net
View 2 RepliesPrevent Duplicate Values Entered By User?
Feb 10, 2012How do I prevent users from a inserting a duplicate value using SQL Query
datatype is VarChar(50)
e.g. the name field has already been defined as "Josh", I don't want it to be able to add another "Josh"
Disabling Button Before Executing VB Code To Prevent Duplicate Records?
Feb 15, 2012I need to disable a button after its pressed so the user does not have the ability to click it again as this would replicate the process in some cases.After alot of searching I found some tips - alot of code I found I could not understand.This is what I have come up with:
On page load:
If Me.Page.IsPostBack Then
'lblDetails.Text = "disabled"
[code]....
I also read somewhere that I should use: System.Threading.Thread.Sleep(1000) to delay the process or something - not entirely sure why I would do this though.Although, the problem with my above code is that when the code behind page performs validation checks, it exits sub before executing my INSERT SQL code - so when it does this it also disables the button.I am not entirely sure if the above method is fool proof or whether it is a **** piece of code that won't work 100% of the time.On another website I found a script to put on the actual HTML page with <script> tags:
Code:
<script type="text/javascript">
disableSubmit(frm) {
[code].....
Interface And Graphics :: Disabling Button Before Executing VB Code To Prevent Duplicate Records?
Aug 5, 2008I need to disable a button after its pressed so the user does not have the ability to click it again as this would replicate the process in some cases. After alot of searching I found some tips - alot of code I found I could not understand.This is what I have come up with:
[code]...
I also read somewhere that I should use: System.Threading.Thread.Sleep(1000) to delay the process or something - not entirely sure why I would do this though.Although, the problem with my above code is that when the code behind page performs validation checks, it exits sub before executing my INSERT SQL code - so when it does this it also disables the button.I am not entirely sure if the above method is fool proof or whether it is a **** piece of code that won't work 100% of the time.On another website I found a script to put on the actual HTML page with <script> tags:
[code]...
But although this works, it does not execute my VB code in the code behind page so I am a little confused where to go here.
Count The Duplicate And Show The Most Duplicate?
Mar 17, 2011I have this data in txt file and the data keeps changing all the time.
[code]...
I would like to read all lines and compare, if the same name and same address is found, which is in the [......], then i need to count it and show the most frequent buyer!should i read it all and put in array, and compare and put the duplicate data and count into another array?
Remove Duplicate Items But Leave At Least One Of The Duplicate Items In The List?
Mar 27, 2012I have a List object and I want to remove the duplicated items but leaving at least one of the duplicated items in the list;I wrote something like this however I would optimize this code for better performance, is there something faster?
Const chars As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Dim rnd As New Random()
Dim mylist As List(Of String) = Enumerable.Range(1, 100).Select(Function(i)
[code].....
Getting Keypress On Timer?
Aug 17, 2009how to get the ascii of a key press on a timer.
View 6 RepliesHow To Handle The 'Fn' Keypress
Feb 25, 2011I am trying to write a program that dims the brightness on my laptop. I have been unable to find the correct code, so I am trying to get it to press 'Fn & Down' on form load. The problem is I cannot find 'Fn' in the e.KeyPress I set up a small program that alerts me of the key pressed and pressing 'Fn' does not give and alert. Pressing 'Fn & Down' Gives a keycode of "None" Is there some way I can register the 'Fn' key in vb.net?
View 2 RepliesHow To Submit On Keypress
Aug 11, 2010I have written a login. Now I want to do this (press return to login):
[Code]...
It does not work. At this time it works only with a button.
How To Track A Certain Keypress
Mar 24, 2012Before anyone tries to close this thread thinking this is for malicous purposes, let me tell you that it's not. What i'm working on is an application to save screenshots to files as soon as the 'Print Screen' key is pressed, as Jpegs or what ever. What i want to do is be able to minimize the application and I still want the application pick up on any 'Print Screen' presses, and save the screenshots. I've tried using the KeyPress event, but I soon realized that it only worked when the application had focus. I plan on using it to save screenshots every time I press 'Print Screen'
View 2 RepliesKeypress Down Detect?
Jun 29, 2010Is there a way to do something when the left mouse curs is down. ive tried:
If apimouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0) Then
do things
end
i have this on a timer so i want as long as mouse is down do this...yess i have declered mouse event but when i try it ignore apmouse event and do the things even if not cursor is down If you donīt Believe in it, Then it Doesnīt Exist!
Keypress In VB 2008?
Feb 22, 2010I am working on a software in Visual Studio 2008 Professional, and I need to write code that will run a certain code on a keypress. I cannot find the necessary code anywhere.
View 2 RepliesUse To 'sniff' For A Certain Keypress?
Dec 7, 2011Is there a method I could use to 'sniff' for a certain keypress.For example, from firefox, I could press ctrl+k and have my program show. Does this capability exist in VB.NET?
View 6 Replies.net - Detecting Ctrl+tab Keypress?
Dec 9, 2010How do I detect a ctrl+tab keypress?
Reason for asking: I want to stop a user from changing tabs in a tab control.
.net - Detecting Keypress While Minimized?
Mar 7, 2011I want to be able to detect when the user presses F10 or Ctrl+F10 outside of my program, and upon receiving the key press, it will send text to whatever they currently have selected (e.g. a text box). How can this be accomplished in the simplest way?
View 3 RepliesAdd Keypress Options To Form?
Apr 21, 2009i want to be able to load form2 by pressing the right mouse button.
here's what i have so far:
Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
If vbKeyRButton = True Then
[Code].....
e.KeyCode is giving me an error.
C# Detect Multiple Keypress?
Jan 11, 2011I am learning C# after tried Java. Ive tried to program a program that can detect keystrokes, however when i add onKeyDown on my form it work but only one key at a time. So ive tried to add my e.keycode detect to a timer and got error. private void key_Tick(object sender, System.EventArgs e, KeyEventArgs e)
That wont work and the timer wont run becuase i have 2 Args. Im really lost and do not really understand
Capturing And Using Keypress Events
Apr 30, 2010I am trying to modifying the "Math Quiz" tutorial to be more user friendly.
The initial tutorial does not consider the users efforts to answer the math problems as quickly as possible.
The problem is that you must use the mouse or tab key rather than the "enter" key to move to the next control after answering. I believe using the "Enter key to be much more intuitive.
Therefore, I wish to modify the program to either:
1. Check the KeyPress event of the NumberUpDown controls to watch for the "Enter" key to be pressed, and if it is, check to ensure that the current NumberUpDown control is not empty (= Nothing) and if both are True, to then TAB to the next control in the TAB order; OR
2. Uses the PreviewKeyDown event to transpose the "Enter" into a "Tab" automatically so the application will then TAB to the next control in the TAB order.
With all of the new changes to VB 2010 from the last version I actually used professionally (VB6), things are REALLY different, so I no longer know how to accomplish this same task in the new manner. especially if it contains working CODE, because I have always learned better the first time from an example. here is my version of the tutorial Code:
'--- Create a Random object to generate random numbers.
Private objRandomValue As New Random
'--- The Integers will store the numbers for the
' addition problem.
[Code]....
Detecting Keypress Outside The Form?
Mar 17, 2009I need to find out how to detect keypress's outside of my form
View 1 RepliesDo Until KeyPress In Console Application?
Mar 9, 2011I have a console application and i want to run some code but at the same time I want to have the ability at any given time to press CTRL + SHIFT + S to stop it,
Now I tried doing something basic like this which would stop if you press X at any given time:
Dim stTest as string
Do Until stTest = "X"
stTest = console.ReadLine
console.WriteLine("you didn't press X yet...")
The problem is that every time before it writes that line it will wait for the user input because i have "Console.ReadLine" on there, I don't want that to happen, I want it to keep going until a set of keys are pressed.
Get App To Trigger Som Events On A Keypress?
Apr 3, 2009trying to get my app to trigger som events on a keypress (lets say left arrow) when my form is not in focus.I've google it bu all i can find looks very complicated, is there an easer way of doing this?Or is it a very complicated thing to do?
View 3 RepliesGetting KeyPress Without Form Focus?
Sep 29, 2009I want to create a program that gets if the user has pressed a code, for example F8, but without the user having to have focus on the form. I want the program to start hidden, and while the user works normally (say browses the internet (Go Google Chrome)), he just presses F8 and the form shows up. So I ask, is there any way to get key presses outside the form? [code]
View 2 RepliesHow To Add Keypress Options To Form
Dec 31, 2010Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
If vbKeyRButton = True Then
[code].....
Keypress (not Send) Event?
Jun 2, 2010I couldn't manage what the matter is not even after searching. Here my question goes:I need to do a simple task (close my form on pressing escape key) and I use the following code:
Code:
Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs)
Select Case (e.KeyData)
'Close on Escape
Well , it works when I click escape my form closes , but.. if I have pressed by accident or some else matter any of the arrow keys (up , down , left , right) before escape and then hit escape nothing happens. I checked if any other key does that and as I see it does not.
