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How to make the event wait until a boolean is changed

I have an event registered.
layout.SizeChanged += parentToggleBox.Resize;
Problem is, I would like this Resize event to wait until my mouse has moved away from the box.
How to make this event wait until a boolean is changed from false to true?
or wait until OnMouseLeave(object sender, MouseEventArgs e) is triggered?

Here's an example that I put together:
public class Form1 : Form
{
private Panel Panel1;
private Label Label1;
public Form1()
{
this.Panel1 = new Panel()
{
BackColor = System.Drawing.Color.Red,
};
this.Label1 = new Label()
{
Top = 200,
Text = "Click",
};
bool clicked = false;
bool entered = false;
this.Panel1.Click += (s, e) =>
{
this.Panel1.BackColor = System.Drawing.Color.Blue;
clicked = true;
};
this.Panel1.MouseEnter += (s, e) =>
{
this.Panel1.BackColor = System.Drawing.Color.Yellow;
clicked = false;
entered = true;
};
this.Panel1.MouseLeave += (s, e) =>
{
if (entered && clicked)
{
this.Panel1.BackColor = System.Drawing.Color.Green;
this.Label1.Text = "Success";
}
};
this.Controls.Add(this.Panel1);
this.Controls.Add(this.Label1);
}
}
I've used a Click event rather than a Resize to demonstrate the technique.
Effectively this is just setting two booleans and when the right combination of entered and clicked occurs then the code in the block that contains this.Label1.Text = "Success"; will run.
The colours are set for debugging purposes.
To run, do this:
var form1 = new Form1();
form1.ShowDialog();

How to change button color on button click in C#?

I am creating an online test application, in which I am generating approximately 100 buttons at run time on form load. Here is the piece of code:w
private void addQuestion_Reviewbutton()
{
for (int i = 1; i <= clsGlobalVars.gnTotalQuestion; i++)
{
Button button = new Button();
button.Location = new Point(160, 30 * i + 10);
button.Click += new EventHandler(ButtonClickOneEvent);
button.Tag = i;
button.Name = "Question" + i;
button.Text = i.ToString();
button.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.button));
button.BackgroundImageLayout = ImageLayout.Stretch;//.Zoom;
button.FlatAppearance.BorderSize = 0;
button.Size = new System.Drawing.Size(47, 41);
button.BackColor = Color.Transparent;
button.FlatStyle = FlatStyle.Flat;
button.Font = new System.Drawing.Font("Segoe UI Semibold", 12);
button.ForeColor = Color.White;
button.Cursor = Cursors.Hand;
flowLayoutPanel1.Controls.Add(button);
}
}
and on this button click, I am changing the background-color.
void ButtonClickOneEvent(object sender, EventArgs e)
{
Button button = sender as Button;
//button.BackColor = Color.Yellow;
button.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.button_Orange));
lblQuestionNo.Text = ((int)button.Tag).ToString()+".";
btnNext.Focus();
}
I have a button on the form Named "Next". Now my problem is that if I am currently in question "1." and I press the button next I want to change the background image of the button whose text is "2".

Yo check this !
tldr; the guidance are
Is the click event go to ButtonClickOneEvent ?
How to call other button
...
profit?
protected void Page_Load(object sender, EventArgs e)
{
addQuestion_Reviewbutton();
}
void ButtonClickOneEvent(object sender, EventArgs e)
{
Button button = sender as Button;
var currentbtn_id = button.ID;
int nextid = Convert.ToInt32( currentbtn_id.Substring("Question".Length)) + 1;
var nextBtn = flowLayoutPanel1.FindControl("Question"+ nextid.ToString() );
(nextBtn as Button).BackColor = Color.Red;
}

Adding textbox to a tablelayoutpanel causes the textbox to appear in 'random' places

I have a simple winform application which allows users to drag controls to a tablelayoutpanel. But after some testing and trying to drag controls to a specific index row, I found out it doesn't work, not even with a hardcoded index number.
With the provided code example, I'm trying to add a textbox to row index 2, but when I drag content from the listbox to the tablelayoutpanel, it just adds the textbox in 'random' places as seen in the screenshot below
I expect the existing textboxes to shift down and make place for the textbox that's being added, as far as I understand from this: https://social.msdn.microsoft.com/Forums/windows/en-US/e4312cd8-6031-4a5c-92bf-e8adb1941fe5/insert-row-at-particular-position-in-table-layout-panel?forum=winforms.
Am I doing something wrong?
Designer code:
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.listBox1 = new System.Windows.Forms.ListBox();
this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
this.SuspendLayout();
//
// listBox1
//
this.listBox1.FormattingEnabled = true;
this.listBox1.Location = new System.Drawing.Point(367, 12);
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(190, 407);
this.listBox1.TabIndex = 0;
this.listBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.listBox1_MouseDown);
//
// tableLayoutPanel1
//
this.tableLayoutPanel1.ColumnCount = 1;
this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));
this.tableLayoutPanel1.Location = new System.Drawing.Point(13, 12);
this.tableLayoutPanel1.Name = "tableLayoutPanel1";
this.tableLayoutPanel1.RowCount = 1;
this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
this.tableLayoutPanel1.Size = new System.Drawing.Size(332, 407);
this.tableLayoutPanel1.TabIndex = 1;
this.tableLayoutPanel1.DragDrop += new System.Windows.Forms.DragEventHandler(this.tableLayoutPanel1_DragDrop);
this.tableLayoutPanel1.DragEnter += new System.Windows.Forms.DragEventHandler(this.tableLayoutPanel1_DragEnter);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(569, 431);
this.Controls.Add(this.tableLayoutPanel1);
this.Controls.Add(this.listBox1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
}
Form code:
public partial class Form1 : Form
{
private int tempInt = 0;
public Form1()
{
InitializeComponent();
listBox1.Items.AddRange(new object[] { "test" });
tableLayoutPanel1.AllowDrop = true;
tableLayoutPanel1.GrowStyle = TableLayoutPanelGrowStyle.AddRows;
tableLayoutPanel1.AutoScroll = true;
tableLayoutPanel1.RowCount = 3;
}
private void listBox1_MouseDown(object sender, MouseEventArgs e)
{
tempInt++;
DoDragDrop("test" + tempInt, DragDropEffects.Copy);
}
private void tableLayoutPanel1_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
private void tableLayoutPanel1_DragDrop(object sender, DragEventArgs e)
{
string text = e.Data.GetData(typeof(String)) as string;
TextBox tb = new TextBox();
tb.Dock = DockStyle.Fill;
tb.Text = text;
// I want to add the textbox to the second row
tableLayoutPanel1.Controls.Add(tb, 0, 2);
tableLayoutPanel1.SetRow(tb, 2);
}
}
EDIT:
Added code based as DonBoitnott's suggested
private void tableLayoutPanel1_DragDrop(object sender, DragEventArgs e)
{
string text = e.Data.GetData(typeof(String)) as string;
TextBox tb = new TextBox();
tb.Dock = DockStyle.Fill;
tb.Text = text;
tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.AutoSize));
for (int i = 0; i < tableLayoutPanel1.Controls.Count; i++)
{
int pos = tableLayoutPanel1.GetRow(tableLayoutPanel1.Controls[i]);
if (pos > 1)
{
tableLayoutPanel1.SetRow(tableLayoutPanel1.Controls[i], pos + 1);
}
}
tableLayoutPanel1.Controls.Add(tb, 0, 2);
}

Give this modified form class a try, I've made a few changes throughout:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
listBox1.Items.AddRange(new Object[] { "TextBox" });
tableLayoutPanel1.AllowDrop = true;
tableLayoutPanel1.GrowStyle = TableLayoutPanelGrowStyle.AddRows;
tableLayoutPanel1.AutoScroll = true;
tableLayoutPanel1.RowStyles.Clear();
tableLayoutPanel1.ColumnStyles.Clear();
tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100f));
}
private void listBox1_MouseDown(Object sender, MouseEventArgs e)
{
var count = tableLayoutPanel1.Controls.Count;
DoDragDrop($"test{count + 1}", DragDropEffects.Copy);
}
private void tableLayoutPanel1_DragEnter(Object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
private void tableLayoutPanel1_DragDrop(Object sender, DragEventArgs e)
{
var tb = new TextBox();
tb.Dock = DockStyle.Fill;
tb.Text = (e.Data.GetData(typeof(String)) as String);
var newRow = tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.AutoSize));
var ctrl = tableLayoutPanel1.GetChildAtPoint(tableLayoutPanel1.PointToClient(new Point(e.X, e.Y)));
if (ctrl != null)
{
var pos = tableLayoutPanel1.GetRow(ctrl);
for (Int32 i = tableLayoutPanel1.RowStyles.Count - 2; i >= pos; i--)
{
var c = tableLayoutPanel1.GetControlFromPosition(0, i);
if (c != null)
tableLayoutPanel1.SetRow(c, i + 1);
}
tableLayoutPanel1.Controls.Add(tb, 0, pos);
}
else
tableLayoutPanel1.Controls.Add(tb, 0, newRow);
}
}
The basic steps are:
Did I drop onto an existing control? If so, determine where.
If so, work bottom to top, moving each control down a slot. You must avoid overlapping, two controls cannot occupy the same cell.
If so, insert the new control into the newly emptied slot at the drop point.
If not, simply add the control at the end.

Event not firing for dynamically created Label

I have a Windows form with labels and I created a common click event handler for all the labels.
The event is bound from code. Now I need to create some more labels in run-time and bind the same event handler to those dynamically created labels. I tried the following but it didn't work.
private void Ctrl_Click(object sender, EventArgs e)
{
Control control = (Control)sender;
if (control is Label)
{
Label lbl = (Label)sender;
txtCaption.Text = lbl.Text;
cboFont.Text = lbl.Font.FontFamily.Name;
txtSize.Text = lbl.Font.Size.ToString();
chkBold.Checked = lbl.Font.Bold;
txtX.Text = lbl.Location.X.ToString();
txtY.Text = lbl.Location.Y.ToString();
txtWidth.Text = lbl.Width.ToString();
gbLogo.Visible = false;
gbControl.Visible = true;
gbDetail.Visible = false;
}
}
private void btnAddDynamic_Click(object sender, EventArgs e)
{
Label label = new Label();
int count = pl.Controls.OfType<Label>().ToList().Count;
label.Location = new Point(50, (25 * count) + 2);
label.AutoSize = true;
Graphics g = label.CreateGraphics();
label.Width =Convert.ToInt32(g.MeasureString(label.Text, label.Font).Width);
label.Name = "label_" + (count + 1);
label.Text = "label " + (count + 1);
label.TabIndex=0;
label.Click += new EventHandler(this.Ctrl_Click);
pl.Controls.Add(label);
}

How to use inheritance for calling and object from another class in C#

I am trying to call a button's visibility, from a MouseHover event on another object.
What I'm trying to do is when I mouse over a pictureBox to set the button that is attached to that pictureBox to be visible, on default the button when it is created is invisible.
When I try to call it from the MouseHover event it says that the button is null. I'm not that good with inheritance so I'm kinda stuck here, any help would be appreciated.
Here is the code (what I'm trying to do is only on MouseHover event):
private void Button1_Click(object sender, EventArgs e)
{
FlowLayoutPanel flP = new FlowLayoutPanel();
PictureBox picB = new PictureBox();
Label laB = new Label();
Button btn = new Button();
picB.Size = new Size(130, 70);
laB.Size = new Size(130, 20);
flP.Size = new Size(130, 90);
btn.Size = new Size(20, 20);
laB.Text = "Text";
laB.Name = "Name";
flP.Name = "Name";
btn.Text = "X";
btn.Name = "Name";
btn.Visible = false;
flP.Controls.Add(picB);
flP.Controls.Add(laB);
picB.Controls.Add(btn);
flP.Location = new System.Drawing.Point(3, 3);
laB.Location = new System.Drawing.Point(3, 70);
btn.Location = new System.Drawing.Point(100, 5);
mainFLP.Controls.Add(flP);
picB.MouseHover += picB_MouseHover;
picB.DoubleClick += picB_DoubleClick;
}
private void picB_MouseHover(object sender, EventArgs e)
{
PictureBox pb = (PictureBox)sender;
Button bt = pb.Parent as Button;
//bt.Visible = true;
}
private void Form1_Load(object sender, EventArgs e)
{
for (int i = 1; i <= 10; i++)
{
FlowLayoutPanel flP = new FlowLayoutPanel();
PictureBox picB = new PictureBox();
Label laB = new Label();
Button btn = new Button();
picB.Size = new Size(130, 70);
laB.Size = new Size(130, 20);
flP.Size = new Size(130, 90);
btn.Size = new Size(20, 20);
flP.Name = i.ToString();
laB.Name = "Link";
laB.Text = "Name";
btn.Text = "X";
btn.Name = "b" + i.ToString();
btn.Visible = false;
flP.Controls.Add(picB);
flP.Controls.Add(laB);
picB.Controls.Add(btn);
flP.Location = new System.Drawing.Point(3, 3);
laB.Location = new System.Drawing.Point(3, 70);
btn.Location = new System.Drawing.Point(100, 5);
mainFLP.Controls.Add(flP);
picB.MouseHover += picB_MouseHover;
picB.DoubleClick += picB_DoubleClick;
}
}
private void picB_DoubleClick(object sender, EventArgs e)
{
PictureBox pb = (PictureBox)sender;
FlowLayoutPanel flp = pb.Parent as FlowLayoutPanel;
flp.Dispose();
}

One method can be to store the Button variable in tag property of your picture box:
PictureBox picB = new PictureBox();
Button btn = new Button();
picB.Tag = btn;
and later, in your MouseHover Hanlder
private void picB_MouseHover(object sender, EventArgs e)
{
PictureBox pb = (PictureBox)sender;
Button bt = pb.Tag as Button;
//bt.Visible = true;
}

It is null because the sender of the event is the picture, not the button.
You can simply declare the button at the class level
private Button btn;
private void Button1_Click(object sender, EventArgs e)
{
FlowLayoutPanel flP = new FlowLayoutPanel();
PictureBox picB = new PictureBox();
Label laB = new Label();
btn = new Button();
and then directly make it visible
private void picB_MouseHover(object sender, EventArgs e)
{
bt.Visible = true;
}
Edit
Or you can define a Dictionary to associate the found PictureBox with the corresponding Button
private var btnDict = new Dictionary<PictureBox,Button>();
and when you create them, you can also link them,
PictureBox picB = new PictureBox();
Label laB = new Label();
Button btn = new Button();
btnDict.Add(picB,btn);
so that you can retrieve the button with a command like
PictureBox pb = (PictureBox)sender;
var btn = btnDict[pb];