I tried to update a DataGridView every 1 second.
I used a timer, but I see the user interface for the form become very slow.
I used a BackgroundWorker, but I didn't get any data in the DataGridView
Here is the DataGridView code:
Private Sub OrderBookOffersForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
BackgroundWorker1.RunWorkerAsync()
End Sub
Private Sub BackgroundWorker1_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
Me.OrderBookOfferBidsTableAdapter.Fill(Me.BinanceDataSet.OrderBookOfferBids)
Me.OrderBookOfferAsksTableAdapter.Fill(Me.BinanceDataSet.OrderBookOfferAsks)
End Sub
Private Sub BackgroundWorker1_RunWorkerCompleted(sender As Object, e As RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
BackgroundWorker1.RunWorkerAsync()
End Sub
Here is the timer code:
Me.OrderBookOfferBidsTableAdapter.Fill(Me.BinanceDataSet.OrderBookOfferBids)
Me.OrderBookOfferAsksTableAdapter.Fill(Me.BinanceDataSet.OrderBookOfferAsks)
Related
I have used movePrevious() method and moveNext() method but that does not work once I search through the database. I mean that thing works fine when I first load the form but after I search for certain value and then try to use the button it dies not work. Remember I am just a beginner in visual basic.
Private Sub EmployeeBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs)
Me.Validate()
Me.EmployeeBindingSource.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.CEMPLOYEEDataSet)
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Me.Close()
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Try
Me.EmployeeTableAdapter.emp_id(Me.CEMPLOYEEDataSet.Employee, New System.Nullable(Of Integer)(CType(TextBox1.Text, Integer)))
Catch ex As System.Exception
System.Windows.Forms.MessageBox.Show(ex.Message)
End Try
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
EmployeeBindingSource.MovePrevious()
End Sub
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
EmployeeBindingSource.MoveNext()
End Sub
Picture of my form
I have a problem with the TextBox1.TextChanged event.
My code :
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
MsgBox("txt was changed")
TextBox1.Clear()
End Sub
The problem is that the MsgBox is shown twice, but I want to show it just one time and clear the TextBox. How can i do that?
Two ways:
Temporarily remove the handler to prevent the event firing again:
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
MsgBox("txt was changed")
RemoveHandler TextBox1.TextChanged, AddressOf TextBox1_TextChanged
TextBox1.Clear()
AddHandler TextBox1.TextChanged, AddressOf TextBox1_TextChanged
End Sub
or
Create a field to check if the event is originating from itself:
Dim textBoxAlreadyChanging As boolean = False
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
If Not textBoxAlreadyChanging Then
MsgBox("txt was changed")
textBoxAlreadyChanging = True
TextBox1.Clear()
textBoxAlreadyChanging = False
End If
End Sub
i am getting really annoyed by this piece of code for visual basic
please can you help. i have looked on YouTube and everywhere else even the vb website!!! i would really appreciate it if someone could help me out
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
MessageBox.Show("Hi!!")
Timer1.Start()
End Sub
Private Sub ProgressBar1_Click(sender As Object, e As EventArgs) Handles ProgressBar1.Click
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
ProgressBar1.Increment(1)
If ProgressBar1.Value = 100 Then
Timer1.Stop()
MsgBox("Jeff")
End If
End Sub
Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs)
End Sub
Private Function GetNumericUpDown1(v As Integer) As Boolean
End Function
Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
If ( : ( ) Then
MessageBox.Show("Well Done!")
End If
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
MessageBox.Show("!!Stopped!!")
Timer2.Stop()
End Sub
Private Sub Timer2_Tick(sender As Object, e As EventArgs) Handles Timer2.Tick
ProgressBar2.Increment(0.6)
If ProgressBar2.Value = 100 Then
Timer2.Stop()
MsgBox("Jeff")
End If
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
MessageBox.Show("!!Started!!")
Timer2.Start()
End Sub
Private Sub SplitContainer1_Panel1_Paint(sender As Object, e As PaintEventArgs) Handles SplitContainer1.Panel1.Paint
End Sub
Private Sub NotifyIcon1_MouseDoubleClick(sender As Object, e As MouseEventArgs)
End Sub
Private Sub TreeView1_AfterSelect(sender As Object, e As TreeViewEventArgs)
End Sub
Private Sub Timer3_Tick(sender As Object, e As EventArgs) Handles Timer3.Tick
ProgressBar3.Increment(1)
If ProgressBar3.Value = 100 Then
Timer3.Stop()
End If
End Sub
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
Timer3.Start()
End Sub
Private Sub ProgressBar3_Click(sender As Object, e As EventArgs) Handles ProgressBar3.Click
End Sub
End Class
BTW:this is my first post so it is probably rubbish!!
I don't have enough points to comment.
First off, as others have said we can't recreate this since we have no idea what your Form looks like or what you are expecting it to do.
Secondly, you should turn on Option Strict in the Compile section of Project properties to avoid technical errors like ProgressBar2.Increment(0.6) since 0.6 isn't a valid integer.
I threw together a TabControl (which you never mentioned in the OP) with 3 tabs and the various buttons and progress bars you list in what seemed like a logical fashion to me and it ran just fine for what code you have. Clicked the button on each tab and each progress bar eventually got to 100%. I have no idea what else you were expecting.
If you remove all the empty subs and action listeners, it would be easier to detect the problem
Can you help me with this, my code doesn't have error but when I click the button to go back to the previous group box it doesn't work :( Idk why can you help me guys figure it out?
The app has login form when you login it directs you to the another form that you can choose categories then if I select a category example I chose gadgets it redirects me to the gadgets groupbox then if I try to go back it doesn't go back in the categories page
The button2.click, button6.click and button3.click are the back buttons
Here's my code
Public Class Form3
Private Sub PictureBox2_Click(sender As Object, e As EventArgs) Handles PictureBox2.Click
GroupBox2.Show()
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim sbutton As DialogResult
sbutton = MessageBox.Show("Do you want to logout now?", "Logging out", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If sbutton = DialogResult.Yes Then
Form1.Show()
Me.Hide()
End If
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
GroupBox1.Show()
End Sub
Private Sub LinkLabel1_LinkClicked(sender As Object, e As LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
GroupBox3.Show()
End Sub
Private Sub LinkLabel2_LinkClicked(sender As Object, e As LinkLabelLinkClickedEventArgs) Handles LinkLabel2.LinkClicked
GroupBox4.Show()
End Sub
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
MsgBox("Message was sent!", MsgBoxStyle.Information)
TextBox1.Clear()
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
GroupBox2.Show()
End Sub
Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
MsgBox("Message was sent!", MsgBoxStyle.Information)
TextBox2.Clear()
End Sub
Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
GroupBox2.Show()
GroupBox3.Hide()
End Sub
Private Sub Form3_Load(sender As Object, e As EventArgs) Handles MyBase.Load
GroupBox2.Hide()
GroupBox3.Hide()
GroupBox4.Hide()
End Sub
End Class
Umm did you type this yourself or generate it from a UI? Shouldn't it be button_OnClick not button_click?
Public Class Form1
Private Sub ItemsBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs) Handles ItemsBindingNavigatorSaveItem.Click
Me.Validate()
Me.ItemsBindingSource.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.LolokikoDataSet)
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'LolokikoDataSet.Items' table. You can move, or remove it, as needed.
Me.ItemsTableAdapter.Fill(Me.LolokikoDataSet.Items)
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
ItemsBindingNavigatorSaveItem.PerformClick()
MsgBox("updated")
End Sub
End Class
I'm just following a YouTube tutorial on DataGrid and my save button doesn't work.