How to show a User Control after loading all its controls? - vb.net

I have a panel in a WinForm application, is used to display a User Control. The code is this:
Public Sub AddUserControlsToPanel(us As UserControl)
pn.Dock = DockStyle.Fill
pnContainer.Controls.Clear()
pnContainer.Controls.Add(pn)
End Sub
This code works perfectly but while the User control is dispalying on the panel, I can see that it renders too slow. I have also some User Controls with a DataGridView or a ListView that display data from the data base, on those cases, the User control takes between 5 to 10 sec to render completly.
Here is what happends when I load a User Control with Textboxes, Buttons and Lables and in this case (ListView, the same happends on a DataGridView) takes time to load and it's not in it position when displayng.
What can I do to display it faster? or How can I display it after loading all its control?

Related

VB.NET - Navigating without loading another form

I'm currently developing a simple enrollment system for our school project. I have multiple modules that when clicked will open a new form with another set of sub modules.
However, I hate how forms load every time I open a new form. Is there like a way that when I clicked say for example "Enrollment" button, instead of loading a new form, it will change all the controls instead. Tried using User Control but it keeps crashing my program down after I created 2 user controls and load them in one form.
Main Form;
Enrollment Sub Form
Please help me guys.
As LarsTech mentioned I would use user controls instead of forms.
Each user control would be setup the same way as your form is, but can be loaded to a panel on the main form, allowing for a single form to show all content.
Dim myControl = New ControlYouCreated
panel1.Controls.Add(myControl)
myControl.bringtofront
This for example, will bring in the contents of the user control you created, into your form1 panel.

How to capture popup webpage in tabcontrol browser

How to capture the popup when clicked when the button is clicked in webbrowser it opens a popup webpage i need to capture the popup webpage to the tabcontrolbrowser
I think I understand what you are trying ask for. I have had a similar issue where I must display a form nested within another form. To do so I have used code similar to this:
aForm = New TLoginForm
aForm.TopLevel = False
pnlLoginPanel.Controls.Add(aForm)
If aForm.WindowState <> FormWindowState.Maximized Then
aForm.WindowState = FormWindowState.Maximized
End If
aForm.Show()
I like using a panel control to contain the form I am instantiating. It is just easier for me to understand the bounds of the form when it is getting displayed and it is easier to use a panel control's Controls.Add ability than a tab-page's alone. When I am using a log-in form or another type of form nested within another form I create a panel control to 'hold' the form inside and provide bounds for it to be displayed in. Then the TopLevel property of the log-in form must be set to False so that the form I am displaying knows it will not be displayed on its own as a top level window. Be sure to do this as an error can be encountered otherwise. The WindowState.Maximized is to ensure that the form fills the panel.

not able to set readonly property of textboxes in a panel in windows form to true in vb.net

i want to enable the read only property of all the text boxes in a panel in windows forms to true during form load but its not working. i am using the below code.when i am debugging the code it skips that part.not sure why??
The below code does not work,it skips that part as if there are no text box controls in the particular panel.
Private Sub lockgroupcontrols()
For Each TextBox As TextBox In Pnltransaction.Controls.OfType(Of TextBox)()
TextBox.ReadOnly = True
Next
End Sub
Your code seems correct, so, I can only imagine that, if it skips the For Each, then you don't have any textboxes inside the PnlTransaction panel.
Sometimes this happens when you draw the Panel over preexisting textboxes. You think the controls are inside the panel, but in reality they are under the panel and you see them because the panel background is transparent.
Try to move the panel on a different place, drag&drop the textboxes over the panel and then reposition the panel.
You shouldn't use TextBox as name for your vars
For Each **TextBox** As **TextBox** In
try it with for ex.
...For Each **tBox** As **TextBox** In
tBox.ReadOnly = True....

Form maximize on another form

I have an MDI application which contains many child forms
My problem is, on clicking a particular menu, I am opening a form with maximize window in the MDI form. This works fine.
Now if I open another form above the first one, and if i want the second form to be of normal size, i am unable to do it.
Second form also opens with maximized window similar to first one. I want the second form to be of normal small size.
I want to show second form normally and first form maximized.
How can i do that?
Private Sub TESTToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles TESTToolStripMenuItem.Click
Dim f As New newCalendar2("UGHARANI")
f.Show()
f.MdiParent = Me
f.WindowState = FormWindowState.Maximized
End Sub
Okay, I think I understand what you're trying to accomplish: you want the first (data) form to be a kind of background to your MDI application and have the other forms display on top of it, right?
Well one way to do it might be to remove borders from the background form –FormBorderStyle = None– and fill-dock it in the MDI parent form. Although it would end up coming to the fore and hiding all your other forms if a user clicked anywhere on it. But if it doesn't require any user interaction you could always use its Activate event to send it back to the background, using Me.SendToBack().

Loading user control dynamically loses data

I have a created a user control. This user control I dynamically load on a page inside Telerik Panelbar control. I have done all necessary coding to save the viewstate and load this dynamically created usercontrol every time page loads.
On this User control I have a asp panel. By default this panel is invisible. When user clicks a button on this user control panel is made visible. On page load of this user control I populate all the controls on this panel.
Everything works fine if I don’t load this use control dynamically but when I load this user control dynamically and if I make panel visible by default then only all fields on the panel are populated. But if I make by default invisible and on button click make panel visible none of the text boxes or comboboxes are populated.
I populate comboboxes on page load of the userControl but inbetween postbacks all the comboboxes on the user control loose data.
ON the parent page I am saving the viewstate
This is my code on parent page to dynamically load userControl ( which has panel on it)
Dim ucPiggyBank As SubscriberSetupPages_UserControls_PiggyBank = CType(LoadControl("~/SubscriberSetupPages/UserControls/PiggyBank.ascx"), SubscriberSetupPages_UserControls_PiggyBank)
With ucPiggyBank
.PiggyBankID = account.Id
.ID = account.Id.ToString
'Setting up following 3 properties here to avoid database trips
.PiggyBankEligibleAccounts = piggyBankEligibleAccountCollection
.MemorizedNames = memorizednames
.Period = period
End With
radPanelNewChild.Controls.Add(ucPiggyBank)
radPanelNew.Items.Add(radPanelNewChild)
radPanelNew.Expanded = True
‘this is the Panel item on parent page of Telerik Panelbar control.
Dim radPanelPiggyBank As RadPanelItem = DirectCast(pnlbarPiggyBank.FindItemByValue("TestItem"), RadPanelItem)
With radPanelPiggyBank
.Items.Add(radPanelNew)
.DataBind()
End With
‘I am doing everything for saving viewstate on parent control
This is the code on page load of userControl
If Not IsPostBack Then
If m_PiggyBankID <> Guid.Empty Then
'Load data
Call GetPiggyBankDetails()
End If
I have a edit button on the user control which makes panel visible. It makes panel visible but with no data.
Can you please tell me what’s happening?
Thanks in advance.
If data is posted, you can get it from Request.Form[control.UniqueID] , but don't use viewstate possibilities hehe if control added dynamically.