I have a windows form where i try to update a form which has 1000 labels. By update i mean i try to set the color of the labels. And i am doing this update in windows form timer every 1 sec.
My problem is the UI freezes. I tried using a thread. In the thread i tried to call the update code, but still the UI hangs.
My project will end up with several forms to be filled out. Once a form is completed, a button can be pressed revealing the next form or previous form if something is going to be changed. I've been using Me.Hide() so that the users screen doesn't get to cramped.
I'd like a few things to happen. If an input from one form changes a value on another I'd like it to update automatically, I figure some event on button_click or form_load. My problem is that different things work depending on how I open or hide a form. I would also like the forms that have been Me.Hide() to retain the value in the textboxes. Let me show you from a practice vb project so that you don't have to dig through the larger code.
Public Class Form1
Public Shared Info1, Xcord, Ycord As Double
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]....
1) If I don't use "Public Shared", TextBox1.Text does not update.
2) If I reopen Form1 with the "Dim First As New Form1" method it seems to refresh the Form1_Load. If I use My.Forms.Form1.Show() it does not. Another side effect is that clicking the close button on the ControlBox ends debugging when using "Dim First As New Form1" and does not when using My.Forms.Form1.Show(). Wierd. I've set ControlBox to False on Form2 and Form3, otherwise the program remains running in the task manager. I've read other solutions to that problem, but my solution seems to work for me so far.
3) Xcord and Ycord are my attempts to have the other forms open on top of the first form. My problem now is that I have them set to CenterParent and they open where the first form used to be. If I move Form1, Form2 and 3 open where I've left them instead of centered on Form1, maybe. Form1 is set to WindowsDefaultLocation. My new plan is to set to manual and have Xcord and Ycord update and then offset based on form size. So far I haven't implemented that code.
4) Me.Close() ends the program.
Public Class Form2
Public Info2 As Double
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim First As New Form1 'Done so that Form1.Info1 works
[code]....
I'd like a consistent method that represents good programming practice. My understanding is that Public Shared is frowned upon. I'm also wandering if Me.Hide() is the right choice. I've also played around with .ShowDialog() which didn't work?
I have been coding an application for a LeaderBoard for a game. I have all the Login sorted using Mysql and even have all the Account infomation displaying in lables etc. for account info form. Now I am trying to UPDATE information and this is how I was trying to do this...
Dim UpdateInfo As New MySqlDataAdapter
Dim mycommand As New MySqlCommand()
Dim mydata As MySqlDataReader
Dim query = "UPDATE Login SET Pword = '" + UpdateTxtBox.Text + "' WHERE Uname = " + Login.Uname
mycommand.Connection = conn
mycommand.CommandText = query
UpdateInfo.SelectCommand = mycommand
mydata = mycommand.ExecuteReader()
But comes back with an Error saying... Unknown column 'username here' in 'where clause'. Now the username is in the database as I have just logged in with it and I am taking it I have the Query wrong somewhere.
what i'm working on is, i have VB with a loaded Access DB, and i'm using a query to display the information, in a list box and in indivual labels. i have it so it will allow new entries to be made, however i can't figure out the exact code to get it to update to the program the only code i currently am able to show is this since everything is basically being done through access
[Code]...
I created a program that has serval labels on a form and a listview object. It has a button that when clicked reads a textfile and loads up values in the listview object. I then can click and drag text from the listview box to any label on the form and then the program removes the value from the listview box. Now, my question is how can I instruct VB to save these values in the text property of the labels so that the next time the program is loaded the labels will contain the values loaded during the last run time session?
View 1 RepliesWell im currently developing an application for public use, I have a login screen in which the user enter's their registered credential's and the progressbar loads by increments of 3, now i placed 6 labels ontop of eachother and where the progressbar coding is i put:
If Progressbar.Value >= 1 Then
Label3.Show()
If Progressbar.Value >= 20 Then
Label3.Hide()
Label4.show()
And so on up until Label8 Show at 100%,
Now the problem is... As i have placed the labels ontop of eachother i need them hidden until they are called to show, i have tried adding a background worker to do this but have had no luck, all i see is the labels overlapping eachother when i run my application when i want them hidden untill Label3.Show() is called, and then to display them as they are called and hide them when another one is called to show...
I have a textbox named txtWith (Amount where cash should be inputted) and I want the input to have comma. Example, if I input 1000, I want it to be like this 1,000. By the way, this is my code in the textbox.
///THIS CODE WILL DISABLE CHARACTER///
Private Sub txtWith_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtWith.KeyPress
'////////////////LETTERS DISABLED ONLY///////////////////////
If (Asc(e.KeyChar) >= 48 And Asc(e.KeyChar) <= 57) Or Asc(e.KeyChar) = 8 Then
e.Handled = False
Else
e.Handled = True
MsgBox("Please input numbers only!", vbCritical, "Error!")
End If
End Sub
With VB, but I've got the few basics down, file naming, adding objects, naming objetcs, etc. But the reason I'm on here is because I cannot complete even the first step. Our form is 640 X 480, and we need to have two labels, both have vertical scrolls. I know how to add and resize the labels to meet my needs, but I do not know how to create scrolling labels. Or are they text boxes? On our bubble chart (Do you know what that means?) it says lblInformation. We are going to have clickable radio buttons which will update the lblInformation with info about each of the radio buttons.
View 7 RepliesI am trying to extract whichever number is next to a=. I hardwired a value of 1000 for testing purposes.I keep getting an error saying Index and length must refer to a location within the string.Parameter name: length when I try and use substring.
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim text As String = TextBox1.Text
Dim comp(9) As String
[code]....
I always have this problem. I have a textbox but is disabled and you can only input through a button. So, I want the input number "1000" to be like this, "1,000" but I don't know what code to put. Same thing with 100000 = 100,000
View 1 RepliesIf I insert in a Form a progressBar (Max value 1000) and I write this very simple example
For x = 0 To 990 Step 10
ProgressBar1.Value = x
Threading.Thread.Sleep(5)
Next
Me.Close
If I run the code with Windows7 setted as Windows Classic I can see the progress bar value go to the max value and after few time the Form Closes (same with Windows XP).But If I run the program with Windows7 setted as Windows7 Basic the progress bar value ONLY goes to the HALF max value and after half time the form Closes.
The code is the SAME, the PC is the same, Seven is the same (only personalized with different theme) but under Windows7 Basic it seems that For x = 0 To 990 Step 10 becomes For x = 0 To 550 Step 10..The INCREDIBLE thing is that if I insert in the For... Next a row like:
Debug.Print(ProgressBar1.Value.ToString)I obtain right values until 990... but for my eyes the progress bar only goes to half value in half time, then the Form closes.
I am trying to write a simple code that will essentially change the background oclor of a form from say red to green, like every five seconds.(Actually, it will be green 4 and red 6 seconds). I set my timer interval to 1000 and enabled it. So when I write my if/then statements in the timer area, would I be using timer.interval <=4, or timer.interval <=4000 to count off four seconds?
View 1 RepliesI'm trying to make a program that allows the user to click on labels which have a number in it and then that value has to be stored into a different label.
For example the user click on label1 and the values goes into label12, then it click on label3 and the values goes to label13 and so on.
At the moment I can only code on the respective label underneath (1->12,2->13...) but it has to be in any order (5->12,7->13...)
Here a picture and below my code:
'defining the click order....
Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
[Code]...
I want to write code that complete task of putting 0 to 1000 via thread in listbox. I want to start 10 threads at startup and complete task.
All threads should work equally. Each thread will write 100 numbers. First start from 0 to 100, second from 100 to 200, third from 200 to 300, so on upto 10th.
I have written code but it has problem.
Dim num As Int16
Dim startLoop As Int16
Dim endLoop As Int16
[CODE]...
I am trying to insert 11000 records using sqlite in database but values arent inserted though program executes without error.[code]How should i insert?
View 6 RepliesWith lvList
.Clear()
'loading data from database
.View = View.Details
.FullRowSelect = True
[CODE]...
How to add 1000 to each prevbal and put it in the column remainingbal
Say a collection grow. Once it's size reach 10k, I want to get rid the first 9k. How to do so?Oh ya I could use removeRange.Is there another function that will output say, the last 1k of the element, say if I do not want to remove anything? Something like tail or something.
View 7 RepliesI need to show more pages in the control, is it possible? Terje Myklebust
View 2 RepliesI am trying to send more than 1000 emails by using gmail host.It was sending only 158 or 160.I am serching for solution in google.In google I found some articles which has described that we cant send more than 200 mails by using gmail host and some articles said we can send more emails using Thread class.I am using vb.net(visual studio 2005) for developing sites.
View 6 RepliesI am using a listview to populate a table with 1000 rows. The DB table is about questions and answers.
I want to use accordion control with listview. Should i put the accordion control inside listview itemtemplate?
What i want is clicking on the 1st question opens the 1st answer and clicking on the 2nd question closes the 1st answer and opens the 2nd answer.
UPDATE:
I am trying it this way
<asp:ListView ID="lvQuestions" runat="server"
DataKeyNames="QueryID"
DataSourceID="SqlDataSourceQueries">
[Code].....
I am having about 1000 MDI files which has to be merge into a single MDI file for printing.
i tried in MS dos with the help of copy command but icouldnt resolve.
i tried in Visual basic by reading the file in binary mode and converting them into ps files or mdi files which too result in error.
third and final i tried opening the file through word document libraries by referencing and priting in default driver with the help of hp ps drivers.
I have to create program that adds the whole numbers from 1 to 1000 and displays the sum in the label. Create a variation of this program that allows the user to specify any starting whole number and any ending whole number (10,000 or lower) and then adds all the whole numbers in that range. Allow for the possibility that a user may start with a high number and end with a low number. Format the label so that commas are displayed and there are no decimal places showing. I need help with the codes.
View 5 RepliesI am trying to make part of a form program do the following When I exit a text field, I want to import some datainto a datagridview control.The columns are (1)Key, (2)Location, (3)Part Number, (4)Serial Number, (5)Description.There are up to 1000 rows of data in anyone of the spreadsheets I am working from.By using a datagridview, I can click the header and sort the data by either of the 5 columns, and when I select a data row, the Key number is reported back (for now, into a text box)I will be using the key number to further manipulate the spreadsheet after I have solved this problem.There are thousands of articles on DataGridView, and over the past 8 days, I think I have read them all. I have tried many downloadable routines, which haven't populated the DataGridView at all.Please can someone show me a simple program which will do the above task, and will give me a base to start from.I am running MS Office Pro plus 64-bit on Windows 7 and Visual studio 2010 pro
View 2 RepliesI have a listbox with 1091 items in it, which I am adding during design time. Every time Visual Studio tries to save after I manually populate the listbox it will hang indefinitely. Is there any way around this, am I trying to add too many items to a listbox?
View 3 RepliesProject Euler's problem 16:2^(15) = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
What is the sum of the digits of the number 2^(1000)?I have been trying to do this problem for a few days now and i just can't figure out how to get vb.net 2008 to recognize anywhere near that large a number. I have seen in other posts that some software like java has the integer type BigNumber or BigInteger but i cant find anything like that in visual basic. I'm running into this problem a lot using Visual Basic. I also can't seem to find any of the standard upper level math features in visual basic such as factorials and a few others that i can't remember but couldn't find under the math feature. any suggestions? (Sorry let me rephrase, any suggestions on how to do this stuff without switching to a different programming language.)
You can query active directory with an OLEDB provider called ADSDSOOBJECT. This works great except it only returns the first 1000 rows. The following article shows how to work around this limitation in a vb script by setting the "page size" property of the command object. [URL]..I have been able to reproduce that code in VB.NET, but I am having problems getting it translated to OLEDB syntax, because there doesn't seem to be a "Page Size" property, or indeed a "properties" collection of any kind, in OLEDB.
[Code]...
I need to do a MessageBox.Show when ProgressBar1.Value = 1000 or after 10 seconds Button1 was clicked. For the second method, I thought of making a loop but I didn't know how to. I also need to search a string in a file (The string to search will be the text which was entered in a TextBox) and do different things depending on if the string was found or not.
View 8 RepliesI'm trying to make an application where when the user clicks a button, it generates a series of 100 random numbers between 1 and 1000, and then saves those numbers in a text file. All I could come up with is generating ONE random number, but I can't figure out how to make it 100. Here is what I have:
[Code]...
I have a webpage with a form that is used to edit some object. This object contains a Collection of other objects defined like this: Public Overridable Property Employees As List(Of Employee)
On a form I can delete an employee, add a new one or modify existing one. When I click save new values are sent to the server. On a server I check if the user exists. If exists then I modify its values, if it does not exist then I add it. All employees that exist on the server and were not sent are marked as deleted (State changed to EntityState.Deleted). I try to use the following code (dbCollection = database entities, newCollection = collection sent from the form):
[Code]...
This code does not work, because changing to EntityState.Deleted removes the object from collection, and for each loop breaks, since the collection is modified...I know that I can overcome this problem by using a for loop or adding objects to delete to some other list first, but I hope maybe there is a pattern that would make my code nicer.
I have limited experience in VB.net and have become stuck. I have tried to search for answers on other threads without success.I have an application that displays real time data.Queries are made to a MySQL database on another PC over the internet every 10 seconds to gather the most recent data.I have done the query within a BackgroundWorker so that the GUI is still responsive while the query is answered.What I've done works great for several hours or maybe for a couple of days but then the DoWork task appears to hang.
The code I'm using is to run the background worker is:
vb
If Not(backgroundWorker1.IsBusy) Then Me.backgroundWorker1.RunWorkerAsync() End If
The backgroundWorker runs just once and there's very little code in the DoWork routine:
vb
Private Sub backgroundWorker1_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles backgroundWorker1.DoWork rs = New
[code].....
Is there anyway I can set up a timeout on the maximum allowed time that the DoWork task can be active for? And if so how would I then go on to stop the backgroundWorker?I understand that CancelAsync isn't going to help as my DoWork task is not repeating as it runs once only, then stops and 10 secs later I run it again.