.net - Can't Update A Form While In A Loop
Apr 6, 2011
in the program im trying to make i have a button that when clicked starts a fairly lengthly loop, takes a couple minutes to complete. while this is happening im trying to send the an update of the loops progress to a listbox i have setup. Unfortunately these updates dont make it to the list box until the loop is finished, ive tried this with a few different types (progress bar/ rich text box etc). i cant seem to get any form changes through while the loop is in progress.
Is there some option or event thing i need to specify to be able to make changes to the form while in a loop?
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Jan 21, 2010
I'm doing a big loop in my program and throughout the loop I'm updating the textbox in the form.
However the form "hangs" untill the loop is done. How can I keep the form visible and be able to read the updated textbox while the loop is still running? I tried Me.Update() but it didn't work. I'm sure there was something like processdata or something like that but I can't find it anymore...
Example
For x = 1 To 10000
form1.textbox.text=x
Me.Update()
Next
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Feb 19, 2009
I am not getting any errors. But the update query is not executed as it does not change the database.
Dim cmd3 As New SqlCommand
cmd3.Connection = con
cmd3.CommandType = CommandType.Text
cmd3.CommandText = "SELECT * from table 1 join table 2 WHERE (EXP_RETURN_DATE < GETDATE())"
cmd3.ExecuteNonQuery()
[Code] .....
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Apr 18, 2012
I have a program which I'm designing to help organize and move some of my music around. I can create a play list and then add music to it, when I do this it copies the mp3 files to a specified folder and also updates a listbox with the content of that folder.
The code works, however when I run it the program locks up until everything has been copied, the listbox goes from blank at the start to suddenly showing the whole list.[code]...
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Jun 9, 2011
I have a list box where the user can add choices depending on what items they want active in the database but I cannot figure out how loop through this listbox to update the items.
Visual Studio 2010
Dim lstitem As String
For i = 1 To ListBox1.Items.Count()
[Code]....
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Oct 30, 2009
Is there a way to change the text of a label using for loop. I mean if i have labels namely "label1", "label2", "label3" and so on. [code]...
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Jun 27, 2012
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim s As New Staff
[Code]....
Basically I am trying to update each record with 2 random numbers each time the button was clicked,my problem now is, the system will update the record but the data was wrong. Example, by right all data should be different (randomly string) but for some row it was updated with same data but in randomly, something row1 row2 row3 has exactly same data for column 1 and 2 then row 3 has distinct data, second time, row1 row2 same data row3 ro4 with different data. It is in random sequence. When I add a MsgBox to do testing in the For loop the data was updated correctly with all different data.
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Oct 9, 2010
I have a datagrid which has a column called "tick". There is a button which will "ticked" all the the records in the datagrid so the user don't need to do it one by one.I have been reading MDSN but I am more confuse that before.my old vb6 code was:
On Error GoTo cmdTickAll_Click_Error
Me.MousePointer = vbHourglass
'Loop Through and Set all Ticks the Not Ticked[code].....
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Apr 17, 2009
I created a new thread to run with a loop to update a textbox (this is just a demo, in reality this thing would go out to a db every x minutes to request an update). I did this on a timer, but i wanted to try to do it on a different thread.. anyways, this is what I have: (one form, one textbox, and this code...)[code]I'm getting a warning through (the "Thread.CurrentThread.Sleep(2000) part is underlined) which states:"Access of Shared Member, Constent Member, enum Member, or Nested Type through an instance; qualifying expression will not be evaluated".
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Apr 10, 2012
I am working on trying to update a list of items to an Excel spreadsheet. I have created my own custom class called Songs and a List(Of Songs) that I want to update the spreadsheet with. It seems like everything is working -- I have even put in a debug msgbox that displays what Song it is currently on while iterating thru the loop -- but after the code iscomplete, I check the spreadsheet and only the first song in the list gets updated. I'm thinking it must have something to do with either the connection string or the parameters that prevents it from updating any other song records. BTW, there is no errors being tossed so it ats like it everything is being processed, just that the data doesn't change for the update inside the loop. Here is the section of
Private Sub btnProcessList_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnProcessList.Click
Dim adoConn As New Ole.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;data source='" & _
[code].....
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Jan 4, 2010
I am using a loop to update properties of each object of a set of custom objects. The routine knows which controls to update because the controls value is not empty, I don't want the routine setting the corresponding properties to nothing when the control is empty. Now I know how to do this perfectly fine with IF statements such as:
CODE:
But this feels really redundant doing that same IF block over and over for each property/control combination, I thought about creating a separate routine that takes the control as an argument and does all the repetitive IF blocks but I don't know how I could also pass an object property to tell the routine to update that particular property.
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May 26, 2012
I tried it every way I can think off, but nothing can stop it .
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Mar 14, 2011
Makes the following statement about the code below:
**"The computer evaluates the loop condition in the Do...Loop statment to determine whether the loop instructions should be processed. In this case, the inputsales <> String.Empty condition compares the contenst of the input sales variable to the String.Empty value. As you know the String.Empty value represents a zero length, or empty, string if the inputsales variable is empty, the loop condition evaluates to True and the computer process the loop instructions. *If on the other hand the inputsales variable is not empty, the loop condition evaluates to false and the computer skips over the loop instructions.
Based on the code I think it is the opposite: ...that while the inputsales value is not empty it should evaluate to true and process the loop and if it is empty it should evaluate to false and skip the loop?
See below.
Option Explicit On
Option Strict On
Imports System.Globalization
[CODE]...
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Jan 29, 2010
I have a main form with datagridview containing a list of contacts:
VB
Public Class Form1
Private Db As New DataClasses1DataContext
Private Sub Form1_Load
[Code]....
After saving, I get the correct message ("Saved"), and the DataGridView in the first form gets updated in real time.
But... when I take look at the data (or close and reopen the forms) the data in the database (SQL server) have not changed! What happens!
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Nov 30, 2009
How can I update and get values in a Windows Forms application while moving one form to other form (like cookies)?
I need to update the values to some variable and again I am going to refer stored values and need to do some calculations.
I have used cookies in ASP.NET but I am not able to find out the same concept in .NET Windows Forms (C#).
How can these issues be resolves?
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May 15, 2011
I was using 2 forms, the first one has general data capture and the second one is a calendar form. On Form1 I have mulitple windows controls. A Textb ox and beside a Calendar button. When I click on a Calendar Command button, it should open calendar form and once the user selects the date, the date should be placed in the text box on the form1. Identical to this on Form1 I need multiple textboxes that needs date to be captured.I cannot use a global variable for this as I need to validate mulitple text boxes. To explain this, I have a Transaction Date and Date Received. I need to validate whether Transaction date is prior Date Received or not? I dont want to use several global variables b'coz I might need multiple validations as above. Please help me on this.
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Feb 3, 2012
I have a date selector on mdi parent that updates a property when date is changed. When I open a child form, it grabs the property just fine. However if I change the date again after the child is open the date does not change on the child unless I close and reopen the form as expected. What would be the best way to automatically update all open child forms when the date is changed on the parent at anytime? running a timer to parse the date property is impractical.
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Apr 20, 2009
I posted in the wrong forum the first time around, and I'm pretty sure that's why it never even appeared. Oh well. THIS is the right forum now, I hope, so here's my problem:
I'm basically simulating bowling. I've created a form that has a "scoreboard" on it, and I'm updating the cells of the scoreboard to display the bowl result. Without doing 21 if statements, I figured I could call a method, send it which roll number it is, and then use a for loop to update each label's text values.[code]...
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Jun 27, 2012
I have a form that goes through an endless loop and processes data. When I click a button that "closes" the form the form keeps processing even though it is closed. I want the form to completely end and exit out of its loop statement. Then open a new form.Here is the code I am using to close the form
frmMain.Close()
frmMain.Dispose()
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Sep 22, 2010
I update a Form's Title from within the form, but it doesn't update. Any idea how to "Refresh" it so that the update displays?
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Nov 12, 2009
I'm trying to add picture boxes on my form for a connect 4 game. I'm trying to make the grid and use a loop to do so. This is the code I have so far, trying to make it a subroutine I can just call on my form_load.
'create picture boxes for game board
Private Sub pb()
Dim i, j As Int16
Dim space As Int16 = 5
For i = 0 To 3
[Code]...
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Nov 10, 2009
Is it any way to loop so a form always is in focus?
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May 31, 2011
I know I can do the following, but I am trying to shorten my code and learn at the same time, but how do you loop through all shapecontainers that are on a form
For Each d As Shape In Me.ShapeContainer1.Shapes
Dim u As RectangleShape
If TypeOf (d) Is RectangleShape Then
[code]....
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Feb 27, 2010
I want to have a form1 with a button,button1 and when i press the button to open a new form (form2) and display it for 5 mins.Then automatically to display my third form (form3) for 5 min and then loop again.Could you help me on this?
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Sep 4, 2009
I am made program to get Picture Pixel and check Pixel colors.
between looping my Application Form HANG (STOP) and also how can stop loop between working (on Run time)?
in listbox1 picture List with path
For P = 0 To ListBox1.Items.Count - 1
DisplayPic.Image = System.Drawing.Image.FromFile(ListBox1.Items.Item(P))
Call GetPicPixel()
[Code].....
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Jun 26, 2010
I'm building a code editor app in VB.NET (Framework 4.0) and it opens all ".por" files into individual forms consisting of a MenuBar and TextBox (multi-line).Currently I have 20 forms (all duplicates of the first on I designed) and if there are say 4 ".por" files in a directory, the first four will open up while the others hide.
I think it would be far more efficient by coding a new form For each item in form1's ListView...but I want the next so many to be a copy of the first form I designed since I spent a good bit on it.
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Feb 3, 2010
I want to add textboxes in my form as per the input I give. Say, My code will prompt me to enter the no of files I would like to upload... If I give input as "3".... it should generate 3 textboxes to enter the file names....
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Aug 5, 2011
i want an application that has no forms but a tray icon... i do not want to add a form to do this or have a loop..[code]I have been programming in VB for years.
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Feb 12, 2010
I have been battling with resizing a form in code, using either a timer or a for loop. When I say resizing, what I want to do is create the effect of a rolldown/rollup window. On my form, I have a groupbox with search criteria options, and underneath the groupbox, I have a datagridview with several buttons.
The effect I'm trying to create can be seen in Windows XP Security Centre; when you open up the security centre screen, you have your firewall, automatic updates and virus protection areas; to the right of each, there is a small round button, with either an up or down arrow, depending on whether the section is rolled up or down. When you click the button, the section rolls down or up smoothly.
[Code]....
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Nov 7, 2010
I want to give the user 3 chances at logging in and then if after the third chance to close the program. i have some code done so far
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
'Stores MainForm in memory as New Form
Dim MainForm As New frmCustomerDetails
Dim strUsername As String = "User"
[code]....
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