Deleting dynamically added labels

Piyush chhabra

12y1.6kVisual Basic .NET

hello everyone..

i have created a windows form app using visual c#.

in this i have added 10 labels on my form on a button click event.

now on clicking second button, i want 5 out of 10 lables deleted or disappears.

here is my code for making labels.

private void button1_Click(object sender, EventArgs e)

{

for (int f = 0; f < l10; f++)

{

Color randomcolor = Color.FromArgb(rnd.Next(256), rnd.Next(256), rnd.Next(256));

lbl1 = new Label(); // lbl1 is a object of label class declared outside

lbl1.Text = " ";

lbl1.BackColor = randomcolor;

lbl1.Location = new Point(li[f], 20);

lbl1.Size = new Size(40, 20);

this.Controls.Add(lbl1);

}

now how shoud i code in button2 click event..

private void button2_Click(object sender, EventArgs e)

{

???????????????????????????????????

}

PLEASE HELP..!!

3 Replies

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

Vulpes12y ago
Accepted answer
First, Create a List at form level to contain your labels:

private List labels = new List();

Next add your labels to the list:

private void button1_Click(object sender, EventArgs e)
{
for (int f = 0; f < 10; f++)
{
Color randomcolor = Color.FromArgb(rnd.Next(256), rnd.Next(256), rnd.Next(256));
Label lbl = new Label(); // assign to private variable lbl say
lbl.Text = " ";
lbl.BackColor = randomcolor;
lbl.Location = new Point(li[f], 20);
lbl.Size = new Size(40, 20);
this.Controls.Add(lbl);
labels.Add(lbl);
}
}

Finally, if you want to remove say the last 5 labels added, you can do it like this:

private void button2_Click(object sender, EventArgs e)
{
for(int i = labels.Count - 1; i >= labels.Count - 5; i--)
{
labels.RemoveAt(i);
}
}
Vulpes12y ago
Oops, my previous code removed the labels from the list but I forgot to remove them from the Controls collection as well :(

Apologies for that.

You're right that, if you set the Name property of the labels, then you can use Controls.RemoveByKey to remove them.

In fact, if you name them consecutively, then you can dispense with the list altogether:

private void button1_Click(object sender, EventArgs e)
{
for (int f = 0; f < 10; f++)
{
Color randomcolor = Color.FromArgb(rnd.Next(256), rnd.Next(256), rnd.Next(256));
Label lbl = new Label(); // assign to private variable lbl say
lbl.Name = "lbl" + (f + 1).ToString(); // lbl1, lbl2 etc
lbl.Text = " ";
lbl.BackColor = randomcolor;
lbl.Location = new Point(li[f], 20);
lbl.Size = new Size(40, 20);
this.Controls.Add(lbl);
}
}

// to remove say the last 5 labels added, you can now do it like this:

private void button2_Click(object sender, EventArgs e)
{
for(int f = 5; f < 10; f++) Controls.RemoveByKey(lbl + (f + 1).ToString());
}
Piyush chhabra12y ago
Thanx for replying..
but this is not working
this will remove labels only from the list you have made...
i have tried this..
but i got a solution. labels can be removed like this

Controls.RemoveByKey(id);

here id is the key of the label we have added. we can store id in a list and then use them one
by one to delete label..