can't reach dynamically created controls

Valerie Meunier

I created dynamically in panel2 a certain number of textbox depending of the value entered in the first textbox of panel1, and also a button and a lable. The purpose of this is to fill the created textbox with a number and to show the sum of all the numebers in the label.

My problem is that i don't know how to collect the entered value in each created textbox and how to create a button2_Click event for the created button2? When i click on button2, nothing happens. Thanks

using System;
using System.Drawing;
using System.Windows.Forms;

namespace oef1_array
{
public partial class Form1 : Form
{
int quant = 0,sum=0;
int x= 0;
string name="";
public Form1()
{ InitializeComponent(); }

private void textBox1_TextChanged(object sender, EventArgs e)
{ quant= Convert.ToInt32(textBox1.Text); }

private void button1_Click(object sender, EventArgs e)
{
int pointX = 30;
int pointY = 40;
panel2.Controls.Clear();
for (int i = 0; i {
TextBox txt = new TextBox();
txt.Name = "txt" + i.ToString();
txt.Location = new Point(pointX, pointY);
panel2.Controls.Add(txt);
panel2.Show();
pointY += 30;
}

Button bt = new Button();
bt.Name = "button2";
panel2.Controls.Add(bt);
bt.Location = new Point(30, 30 * (quant+1)+20);
bt.Text = "som";
label1.Location = new Point(30, 30 * (quant + 1) + 50);
}

private void button2_Click(object sender, EventArgs e)
{
for (int i = 0; i < quant; i++)
{
name = "txt" + i.ToString();
//sum += name.Text;
label1.Text = sum.ToString();
}

}
}
}

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Mohanty4y ago
Accepted answer
try this
public IEnumerable GetAll(Control control, Type type)
{
    var controls = control.Controls.Cast();

    return controls.SelectMany(ctrl => GetAll(ctrl, type))
                              .Concat(controls)
                              .Where(c => c.GetType() == type);
}

int quant = 0;
private void textBox1_TextChanged(object sender, EventArgs e)
{ quant = Convert.ToInt32(textBox1.Text); }

private void button1_Click(object sender, EventArgs e)
{
    int pointX = 30;
    int pointY = 40;
    panel2.Controls.Clear();
    for (int i = 0; i < quant; i++)
    {
        TextBox textBox = new TextBox();
        textBox.Name = "textBox" + i.ToString();
        textBox.Location = new Point(pointX, pointY);
        panel2.Controls.Add(textBox);
        panel2.Show();
        pointY += 30;
    }

    Button button = new Button();
    button.Name = "button2";
    panel2.Controls.Add(button);
    button.Location = new Point(30, 30 * (quant + 1) + 20);
    button.Text = "Total";
    button.Click += Button_Click;
}

private void Button_Click(object sender, EventArgs e)
{
    int totalVal = 0;
    var textBoxControls = GetAll(panel2, typeof(TextBox));
    for (int i = 0; i < textBoxControls.Count(); i++)
    {
        if (!string.IsNullOrEmpty(textBoxControls.ElementAt(i).Text))
        {
            totalVal = totalVal + int.Parse(textBoxControls.ElementAt(i).Text);
        }
    }
    label1.Text = "total value:" + totalVal.ToString();
}
Valerie Meunier4y ago
I found it: i forgot this:
panel2.Controls.Add(lbl);
Thanks
Valerie Meunier4y ago
Thanks. Meanwhile i tried myself this: everything works except the last but one line: the sum still doesn't appear into the created label2 (not the Toolbox label1). But I see it in the Message.Show.

public partial class Form1 : Form
{
int quant = 0;
Label lbl = new Label();
public Form1()
{
InitializeComponent();
panel1.BackColor = Color.LightSkyBlue;
ActiveControl = textBox1;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
try
{
quant = Convert.ToInt32(textBox1.Text);
}
catch (Exception f)
{
//MessageBox.Show(f.Message);
}
}
private void button1_Click(object sender, EventArgs e)
{
int pointX = 30;
int pointY = 40;
panel2.Controls.Clear();
for (int i = 0; i < quant; i++)
{
TextBox txt = new TextBox();
//txt.Name = "txt" + i.ToString();
txt.Location = new Point(pointX, pointY);
panel2.Controls.Add(txt);
panel2.Show();
pointY += 30;
}
Button bt = new Button();
bt.Name = "button2";
bt.Click += button2_Click;
panel2.Controls.Add(bt);
bt.Location = new Point(30, 30 * (quant+1)+20);
bt.Text = "sum";
lbl.Location = new Point(30, 30 * (quant + 1) + 50);
}
private void button2_Click(object sender, EventArgs e)
{
int sum = 0;
foreach (Control c in panel2.Controls)
{
if (c is TextBox)
{
TextBox txt = (TextBox)c;
sum += Convert.ToInt32(txt.Text);
}
}
lbl.Text = sum.ToString(); // nothing appears
MessageBox.Show(lbl.Text);
}
}