CODEWITHSUNDEEP
c#winformsbutton
Lukas M.
Lukas M.

Reputation: 163

Buttons added dynamically to form don’t appear

I'm trying to create 4 buttons on my form when I click on button1, but the buttons don’t show up. Why not?

private void button1_Click(object sender, EventArgs e)
{
   Button[] b = new Button[4];
   for (int i=0; i < 4; i++)
   {
      b[i] = new Button();
      b[i].Name = "button" + i;
      b[i].Location = new Point(43, 39 + 10 * i);
      b[i].Size = new Size(158, 48);
   }
}

Upvotes: 0

Views: 156

Answers (4)

CoderRoller
CoderRoller

Reputation: 1259

Try this:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace winFormButtons
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Button[] b = new Button[4];
            for (int i = 0; i < 4; i++)
            {
                b[i] = new Button();
                b[i].Name = "button" + i;
                b[i].Location = new Point(43, 39 + 10 * i);
                b[i].Size = new Size(158, 48);    
                b[i].Click += new EventHandler(OnClick);
                this.Controls.Add(b[i]);
            }
        }

        public void OnClick(object sender, EventArgs e)
        {    
            MessageBox.Show("Hello Handler:" + ((Button)sender).Name);    
        }
    }
}

Upvotes: 1

Shaharyar
Shaharyar

Reputation: 12439

Create a Panel on your form. and add this line in your code 

panel1.Controls.Add(b[i])

Upvotes: 0

Grant Thomas
Grant Thomas

Reputation: 45083

All you do is create an array of buttons, and assign buttons at indices. Your form knows nothing of these buttons, they could be an array of integers or anything for all that matters at this point. You will need to put them in the form's container:

Controls.Add(b[i]);

Now your form will take ownership of them, managing disposal when the container is disposed.

Upvotes: 1

Zbigniew
Zbigniew

Reputation: 27584

You have only created them, but you also need to add them to your form with: this.Controls.Add(b[i]);

private void button1_Click(object sender, EventArgs e)
{
   Button[] b = new Button[4];
   for (int i=0; i < 4; i++)
   {
       b[i] = new Button();
       b[i].Name = "button" + i;
       b[i].Location = new Point(43, 39 + 10 * i);
       b[i].Size = new Size(158, 48);

       this.Controls.Add(b[i]);
   }
}

Upvotes: 5

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