How to redraw the controls which were added dynamically

Hello,
Here i am selecting the items from checkedListBox and saving them in ListBox by checking them and I am generating the textboxes according to the item count of list box.

Below is code:

foreach (Object items in checkedListBox1.CheckedItems)

listBox1.Items.Add(items);

int camCount = listBox1.Items.Count;

arrCam = new TextBox[camCount];

int dist = 0;

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

TextBox tx = new TextBox();

arrCam[i] = tx;

foreach (TextBox fortx1 in arrCam)

fortx1.Location = new Point(448, 13 + dist);

groupBox8.Controls.Add(fortx1);

dist += 25;

here the problem is when i check all the items in checkedlistbox,items go to listbox and then generate the textboxes according to the listbox's item count.Till here it working fine,now when i uncheck any item from checkedlistbox the total no. of textboxes should also change but those textboxes are not getting redrawn only previously drawn textboxes remain in form.
 
Can someone help me out where I am going wrong or where is the piece of code missing?

I think that after you've checked all the items and generated the TextBoxes, you'll need to wire up the ItemCheck event to deal with subsequent changes;

checkedListBox1.ItemCheck += checkedListBox1_ItemCheck;

Rather than removing a TextBox altogether when the correspoding item is unchecked, I'd just make it invisible. If the item is then rechecked, you can add the TetxBox back by simply making it visible again.

The code for the handler on this basis will then be as follows (I've assumed item CheckState is never indeterminate):

private void checkedListBox1_ItemCheck(Object sender, ItemCheckEventArgs e)

{

// refresh listBox

listBox1.Items.Clear();

foreach (Object items in checkedListBox1.CheckedItems)

{

listBox1.Items.Add(items);

}

if (e.CurrentValue == CheckState.Checked)

{

arrCam[e.Index].Visible = false;

}

else if (e.CurrentValue == CheckState.Unchecked)

{

arrcam[e.Index].Visible = true;

}

1 Reply

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

Vulpes11y ago
I think that after you've checked all the items and generated the TextBoxes, you'll need to wire up the ItemCheck event to deal with subsequent changes;

checkedListBox1.ItemCheck += checkedListBox1_ItemCheck;

Rather than removing a TextBox altogether when the correspoding item is unchecked, I'd just make it invisible. If the item is then rechecked, you can add the TetxBox back by simply making it visible again.

The code for the handler on this basis will then be as follows (I've assumed item CheckState is never indeterminate):

private void checkedListBox1_ItemCheck(Object sender, ItemCheckEventArgs e)
{
// refresh listBox

listBox1.Items.Clear();

foreach (Object items in checkedListBox1.CheckedItems)
{
listBox1.Items.Add(items);
}

if (e.CurrentValue == CheckState.Checked)
{
arrCam[e.Index].Visible = false;
}
else if (e.CurrentValue == CheckState.Unchecked)
{
arrcam[e.Index].Visible = true;
}
}