How to remove dynamic control from Form

I have 2 problems related to dynamic control.

1)
I hava a array txt to cteate no. of dynamic textbox at run time, i does this successfully.I want remove previously created textbox and add new textboxes to form on button click.

private void button1_Click(object sender, EventArgs e)
{
//txt.Controls.Remove();
//txt[n].Controls.Clear();
n=Convert.ToInt16(textBox1.Text);
txt = new TextBox[n];
for (int i = 0; i < n; i++)
{

txt[i] = new TextBox();
this.Controls.Add(txt[i]);
txt[i].Location = new Point(textBox1.Location.X, textBox1.Location.Y + (i + 1) * 40);
txt[i].BackColor = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));
txt[i].Text = "This is Dynamic TextBox" + (i + 1);
txt[i].Size = new Size(150, 10);

}
}

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2)
how to use textbox.text property with dynamic textbox to use text of textbox.
for ex. i want display a messegebox with text of dynamic textbox.

If you give the dynamic textboxes similar names, then it will make them easier to remove later. Try this (off top of my head, so may not be quite right):

private void button1_Click(object sender, EventArgs e)

{

// remove existing dynamic textboxes

for(int i = this.Controls.Count - 1; i >= 0; i--)

{

Control c = this.Controls[i];

if (c is TextBox && c.Name.StartsWith("txtDynamic"))

{

this.Controls.RemoveAt(i);

c = null;

}

n = Convert.ToInt32(textBox1.Text);

txt = new TextBox[n];

for (int i = 0; i < n; i++)

{

txt[i] = new TextBox();

txt[i].Name = "txtDynamic" + (i + 1).ToString();

this.Controls.Add(txt[i]);

txt[i].Location = new Point(textBox1.Location.X, textBox1.Location.Y + (i + 1) * 40);

txt[i].BackColor = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));

txt[i].Text = "This is Dynamic TextBox" + (i + 1);

txt[i].Size = new Size(150, 10);

}

}

Just use txt[i].Text to display the text contained in the (i + i)th textbox:

// show text in first textbox

MessageBox.Show("The first textbox contains " + txt[0].Text);

1 Reply

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Vulpes13y ago
Accepted answer
If you give the dynamic textboxes similar names, then it will make them easier to remove later. Try this (off top of my head, so may not be quite right):

private void button1_Click(object sender, EventArgs e)
{
// remove existing dynamic textboxes
for(int i = this.Controls.Count - 1; i >= 0; i--)
{
Control c = this.Controls[i];
if (c is TextBox && c.Name.StartsWith("txtDynamic"))
{
this.Controls.RemoveAt(i);
c = null;
}
}

n = Convert.ToInt32(textBox1.Text);
txt = new TextBox[n];
for (int i = 0; i < n; i++)
{
txt[i] = new TextBox();
txt[i].Name = "txtDynamic" + (i + 1).ToString();
this.Controls.Add(txt[i]);
txt[i].Location = new Point(textBox1.Location.X, textBox1.Location.Y + (i + 1) * 40);
txt[i].BackColor = Color.FromArgb(r.Next(255), r.Next(255), r.Next(255));
txt[i].Text = "This is Dynamic TextBox" + (i + 1);
txt[i].Size = new Size(150, 10);
}
}

Just use txt[i].Text to display the text contained in the (i + i)th textbox:

// show text in first textbox

MessageBox.Show("The first textbox contains " + txt[0].Text);