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Grabbing the textbox label

Hello im making my first project with about 10 different textboxes where the user puts data in. when he/she clicks the the textbox the textbox text clears and a virtual numpad form pops up and when he leaves the textbox the numpad "hides".
right now (or i would) i have 2 events for every textbox, a click event and a leave event,
private void sheetWidthBox_Enter(object sender, EventArgs e)
{
vnumPadForm.Location = PointToScreen(new Point(sheetWidthBox.Right, sheetWidthBox.Top));
vnumPadForm.Show();
}
Im sure there is a way of dynamically coding that in one event and just grabbing the label name. i have played around with it a bit on my numpad like this and it works good;
private void button_Click(object sender, EventArgs e)
{
Button b = (Button)sender;
string num = b.Text;
SendKeys.SendWait(num);
}
Like that but instead i want to get the label name
right now (or i would) i have 2 events for every textbox, a click event and a leave event,
it works but very inefficient.

Change the name of the handler to something generic like "anyBox_Enter()", and update to the code below:
TextBox curTextBox = null;
private void anyBox_Enter(object sender, EventArgs e)
{
curTextBox = sender as TextBox;
vnumPadForm.Location = PointToScreen(new Point(curTextBox.Right, curTextBox.Top));
vnumPadForm.Show();
}
Note that I added a class level variable called "curTextBox" that gets set from the generic handler! This will track whatever TextBox was entered last.
Now, one by one, select each TextBox on your Form that you want to wire up to this common handler. After selecting each one, in the Properties Pane, click on the "Lightning Bolt" Icon to switch to the events for that control if they are not already showing. Find the "Enter" entry and change the dropdown to the right so that it says "anyBox_Enter".
Then in your button click handlers you can use the "curTextBox" variable to know where to send the key:
private void button_Click(object sender, EventArgs e)
{
Button b = (Button)sender;
string num = b.Text;
if (curTextBox != null) {
curTextBox.Text = num; // or possibly APPEND this to the TB?
}
}

TextBox always focused

I have a window with a TextBox and a Button. I want to always focus my TextBox, but allow the user to click the button. How can I do it?
I tried it by using a LostFocusEvent, that whould check who has the focus, and if it wasn't the Button it would focus the TextBox back, but I always get a System.StackOverflowException...
This what I was using:
private void TextLostFocus(object sender, RoutedEventArgs e)
{
IInputElement focusedControl = FocusManager.GetFocusedElement(this);
if (focusedControl != btn && focusedControl != txt)
{
txt.Focus();
}
}
Is there a way to do this?

in the button click event you can give focus back to your text box like this.
textbox.focus();

Textbox.Select();
Focus is a lower level method used for custom controls. I would stick to select() or activate()

private void TextLostFocus(object sender, RoutedEventArgs e)
{
((TextBox) sender).Focus();
}

you could use ActiveControl Property to set focus to your text box.
this.ActiveControl = yourTextboxName;

Put focus back on previously focused control on a button click event C# winforms

I have made a custom Number Keypad control that I want to place in my winform application. All of the buttons have an OnClick event to send a value to the focused textbox in my form where I have placed my custom control. Like this:
private void btnNum1_Click(object sender, EventArgs e)
{
if (focusedCtrl != null && focusedCtrl is TextBox)
{
focusedCtrl.Focus();
SendKeys.Send("1");
}
}
focusedCtrl is supposed to be set on the MouseDown event of the button like this:
private void btnNum1_MouseDown(object sender, EventArgs e)
{
focusedCtrl = this.ActiveControl;
}
where this.ActiveControl represents the active control on the form.
My problem is that the button always receives the focus before the event detects what the focused control was previously. How can I detect which control had the focus before the button got the focus? Is there another event I should be using? Thanks in advance!
EDIT: Also, I would rather not use the GotFocus event on each textbox in the form to set focusedCtrl since that can be tedious and because I would like to have all the coding of my custom control be in the control itself and not on the form where it is placed. (I will do this, though, if there is no other practical way to do what I am asking)

Your requirement is fairly unwise, you'll want some kind of guarantee that your button isn't going to poke text into inappropriate places. You really do need to have the form co-operate, only it knows what places are appropriate.
But it is not impossible, you can sniff at input events before they are dispatched to the control with the focus. In other words, record which control has the focus before the focusing event is fired. That's possible in Winforms with the IMessageFilter interface.
Add a new class to your project and paste the code shown below. Compile. Drop the new control from the top of the toolbox onto your form, replacing your existing buttons.
using System;
using System.Windows.Forms;
class CalculatorButton : Button, IMessageFilter {
public string Digit { get; set; }
protected override void OnClick(EventArgs e) {
var box = lastFocused as TextBoxBase;
if (box != null) {
box.AppendText(this.Digit);
box.SelectionStart = box.Text.Length;
box.Focus();
}
base.OnClick(e);
}
protected override void OnHandleCreated(EventArgs e) {
if (!this.DesignMode) Application.AddMessageFilter(this);
base.OnHandleCreated(e);
}
protected override void OnHandleDestroyed(EventArgs e) {
Application.RemoveMessageFilter(this);
base.OnHandleDestroyed(e);
}
bool IMessageFilter.PreFilterMessage(ref Message m) {
var focused = this.FindForm().ActiveControl;
if (focused != null && focused.GetType() != this.GetType()) lastFocused = focused;
return false;
}
private Control lastFocused;
}

Control focusedCtrl;
//Enter event handler for all your TextBoxes
private void TextBoxesEnter(object sender, EventArgs e){
focusedCtrl = sender as TextBox;
}
//Click event handler for your btnNum1
private void btnNum1_Click(object sender, EventArgs e)
{
if (focusedCtrl != null){
focusedCtrl.Focus();
SendKeys.Send("1");
}
}

you have an event called lostFocus you can use
button1.LostFocus +=new EventHandler(dataGridView1_LostFocus);
and in the event:
Control lastFocused;
void dataGridView1_LostFocus(object sender, EventArgs e)
{
lastFocused = sender as Control;
}
in that way you can always know what is the Control that was focused previously
now, correct me if i'm wrong, but you do it for the SendKeys.Send("1"); to know which textBox need to receive the number. for that you can use GotFocus event and register only the textBoxs to it.
you can also do what windows is doing and use just one textbox like here:
if it's fits your needs

What about using this with the parameter forward = false?
Control.SelectNextControl Method
You'd probably call it on your "custom Number Keypad control".

Setting Textbox values which has focus in C# Winforms

I have numeric buttons which when pressed display the number in different text boxes. Now my problem is that i want check which textbox has focus so that the number pressed will be entered in that textbox.
My Code:
private void btn_one_Click(object sender, EventArgs e)
{
if (txt_one.Focused==true)
{
txt_one.Text += btn_one.Text;
}
else if (txt_two.Focused==true)
{
txt_two.Text += btn_one.Text;
}
}
Now my problem is that the above code is not working what is wrong and what will be the solution? I even used something like this
private void btn_one_Click(object sender, EventArgs e)
{
if (txt_one.Focus()==true)
{
txt_one.Text += btn_one.Text;
}
else if (txt_two.Focus()=true)
{
txt_two.Text += btn_one.Text;
}
}
In both the above cases the text is entered in both the text boxes. Any solutions.

This problem is a little tricky (with my experience dealing with Enter, Focus, LostFocus, Leave events, all these things sometimes make your head ache a lot and you should avoid dealing with them if possible), at the time you click your Button, the current Focused control you can know is exactly the Button (ActiveControl is one short way to access it). So the solution is we have to record the track of focused TextBox, hold it in a reference and use it when needed. In fact if the control other than one of your TextBoxes is focused, we have to reset the variable lastFocused to null:
TextBox lastFocused;
//Enter event handler for all your TextBoxes
private void TextBoxes_Enter(object sender, EventArgs e){
lastFocused = sender as TextBox;
}
//Click event handler for your button
private void btn_one_Click(object sender, EventArgs e){
if(lastFocused != null) lastFocused.Text += btn_one.Text;
}

Did "MouseUp" event change value of NumericUpDown?

I need to determine if the value of a NumericUpDown control was changed by a mouseUp event.
I need to call an expensive function when the value of a numericupdown has changed. I can't just use "ValueChanged", I need to use MouseUp and KeyUp events.
Basically, I need to know:
Did the value of the numericUpDown change when the user let go of the
mouse? If any area which is not highlighted in red is clicked, the
answer is no. I need to IGNORE the mouse up event, when ANYWHERE but the red area is clicked.
How can I determine this by code? I find events a little confusing.

This will fire when the user releases the mouse button. You might want to investigate which mousebutton was released.
EDIT
decimal numvalue = 0;
private void numericUpDown1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left && numvalue != numericUpDown1.Value)
{
//expensive routines
MessageBox.Show(numericUpDown1.Value.ToString());
}
numvalue = numericUpDown1.Value;
}
EDIT 2
This will determine if the left mousebutton is still down, if it is exit before performing expensive routine, doesn't help with keyboard button down.
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
if ((Control.MouseButtons & MouseButtons.Left) == MouseButtons.Left)
{
return;
}
//expensive routines
}
Edit 3
How to detect the currently pressed key?
Will help solve the Any key down, Though I think the only ones that matter are the arrow keys

Problem - I need to IGNORE the mouse up event, when ANYWHERE but the red area is clicked.
Derive a custom numeric control as shown below. Get the TextArea of the Numeric Control and ignore the KeyUp.
class UpDownLabel : NumericUpDown
{
private Label mLabel;
private TextBox mBox;
public UpDownLabel()
{
mBox = this.Controls[1] as TextBox;
mBox.Enabled = false;
mLabel = new Label();
mLabel.Location = mBox.Location;
mLabel.Size = mBox.Size;
this.Controls.Add(mLabel);
mLabel.BringToFront();
mLabel.MouseUp += new MouseEventHandler(mLabel_MouseUp);
}
// ignore the KeyUp event in the textarea
void mLabel_MouseUp(object sender, MouseEventArgs e)
{
return;
}
protected override void UpdateEditText()
{
base.UpdateEditText();
if (mLabel != null) mLabel.Text = mBox.Text;
}
}
In the MainForm, update your designer with this control i.e. UpDownLabel:-
private void numericUpDown1_MouseUp(object sender, MouseEventArgs e)
{
MessageBox.Show("From Up/Down");
}
Referred from - https://stackoverflow.com/a/4059473/763026 & handled the MouseUp event.
Now, use this control instead of the standard one and hook on the
KeyUp event. You will always get the KeyUp event from the Up/Down button only i.e. RED AREA when you click the
spinner [Up/Down button, which is again a different control derived
from UpDownBase].

I think you should use Leave event that when the focus of NumericUpDown control gone, it would called.
int x = 0;
private void numericUpDown1_Leave(object sender, EventArgs e)
{
x++;
label1.Text = x.ToString();
}