Develop Reference

set focus to a textBox in uwp [duplicate]

This question already has answers here:
Uwp navigation example and focusing on control
(2 answers)
Closed 6 years ago.
I have a Universal Windows Platform project that has a textBox element.
I'd like to set the focus to it when a Radio Button is clicked.
In the Radio Button click event, I can say:
txtBoxID.IsEnabled = true;
txtBoxID.Text = "";
But how do I set the focus? I saw some answers saying to use:
FocusManager.SetFocusedElement(
but my FocusManager class doesn't have that method.
edit: Solved, thanks. Just needed to know what argument to pass to SetFocus. The other fellow's question which was thought to be similar was regarding an event occurring after he set focus to his control.

All the code you need is:
txtBoxID.Focus(FocusState.Programmatic);
Method is defined in Control.

C# Screen Changing [duplicate]

This question already has answers here:
change active form to show another form
(4 answers)
Closed 9 years ago.
Is there a way to make it so that, when I click a button, instead of needing to bring up a new dialog for my next screen, it just 'replaces' what's on the screen? (For instance, the default screen is a main menu with some buttons, which lead to more in depth screens, like Parts Inventory, and all of it's options now being on the screen).
In the realm of stacking panels, how efficient is this for a larger system? I need at least 30-40 screens going on.
Edit: I'm using Visual Studio 2010 to do this project for school, and using Windows 7 with the default packages.

Instead of creating a new forms for each screen you can create a new user control for each screen. Then you could have one form with a panel and loading the control into the form instead of creating a new form showing it and hiding the old one. Youcould do something like this:
...
MyControlWasForm1 form1 = new MycontrolWasForm1(); // this is a user control
panel1.Controls.Clear();
panel1.Controls.Add(form1);
...
You could also keep references to the old control if you want to be able to go back then just reload it into the panel.Controls when needed. Keep in mind if you don't have a variable referencing the control outside of the method, then when you remove it from the controls it would get garbage collected.
...
//property on main Form
public MyControlWasForm1 Form1 { get; set; }
...
//in method
if(Form1 == null) Form1 = new MycontrolWasForm1(); // this is a user control
panel1.Controls.Clear();
panel1.Controls.Add(Form1);
...

You can use multiple panels stacked and show/hide them depending on what you want to display

How to create a form without any TitleBar? [duplicate]

This question already has answers here:
Remove the title bar in Windows Forms
(7 answers)
Closed 9 years ago.
I am actually developing a UserControl that requires this kind of form.
Normally a WinForms Form looks like this:
If I set "FormBorderStyle = None", it looks like this:
But, I actually need a window without TitleBar like the following:
Please see the difference at the edge of the window. It actually looks more like a context menu.
myForm.Text="";
myForm.ControlBox= false;
This solution leaves the TitleBar so that the form remains movable. This is a problem.
I actually need this: the user click the button and the form appears like the following:
How to do this?

you can use:
yourForm.Text="";
yourForm.ControlBox= false;
and in properties, change : FormBorderStyle to :FixedDialog

To get like that then do not set any title text and make controlbox visible false
like this
yourForm.Text="";
yourForm.ControlBox= false;

How do I display a messageBox on top of, or near its parent Form? [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
center MessageBox in parent form
I am trying to make an C# application and I want to have my messageBox appear near the parent.
I tried:
MessageBox.Show(this,"this operation does not work");
And this doesn't work.

Assuming you're using Windows Forms, create a new class which extends System.Windows.Form to mimic MessageBox. Set the Location property based on your new classes Parent.Location property.

Prevent paint from being called more than once [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
How do I suspend painting for a control and its children?
Winforms Double Buffering
I have a form that draws a bunch of user defined controls (81 of them) each of which contains another ten controls (total 8,100 ish). It all seems to be drawn sequentially (takes ~1 second or so).
I've looked at these two questions, and followed the ier reccomendations (setting this.DoubleBuffered = true on both the form and the custom control, and SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true); on the form, but that did not appear to do anything.
Is there a way to save the paint function of the form, save it in a delegate, swap in a dummy function so that the form does not get redrawn AT ALL, and then putting the real function back and triggering it.
I assume there is a more standard way of doing this, but I was unable to find it (it is not SuspendLayout/ResumeLayout those just deal with layout logic).
How can I do this?

This is the answer: (a link).
But think of it. If you prevent Paint from being happened, how your UI controls should be updated when user interacts with them? There will be no button glowing, no textbox cursor flickerinig and so on.
If you are okay with that then why you just not RenderToBitmap the container of your user controls as its background image?..