add listbox value and text to 2D array

samanta

I have two listboxes and i am adding listbox1 items to listbox2.
listbox 1 items are loaded from database. so i wanted to store listbox1 value and text to 2D array. how to do that please anyone help me

10 Replies

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Vulpes12y ago
Accepted answer
Well, if ListBox1 is data-bound and you want to manipulate its items collection, then the first thing you need to do is to remove the data-binding and then reload it from the array.

// load the array from ListBox1

int count = ListBox1.Items.Count;
string[,] vta = new string[2, count];

for(int i = 0; i < count; i++)
{
vta[0,i] = ListBox1.Items[i].Value;
vta[1,i] = ListBox1.Items[i].Text;
}

ListBox1.DataSource = null; // remove data-binding

// reload ListBox1 from array

for(int i = 0; i < count; i++)
{
ListItem li = new ListItem(vta[1,i], vta[0,i]);
ListBox1.Items.Add(li);
}

The code you'll need to exchange items between the listboxes will then be as follows:

// from listbox1 to listbox2
// clear ListBox2 if necessary

ListBox2.Items.Clear();

// add selected items from listbox1 to listbox2
// and remove them from listbox1 at the same time
// need to iterate backwards though item collection to do this

for(int i = ListBox1.Items.Count - 1; i >=0; i--)
{
ListItem li = ListBox1.Items[i];

if (li.Selected)
{
ListItem li2 = new ListItem(li.Text, li.Value);
ListBox2.Items.Add(li2);
ListBox1.Items.RemoveAt(i);
}
}

// sort listbox2 items by Text property

SortListBox(ListBox2);

// from listbox2 to listbox1

// add selected items from listbox2 to listbox1
// and remove them from listbox2 at the same time
// need to iterate backwards though item collection to do this

for(int i = ListBox2.Items.Count - 1; i >=0; i--)
{
ListItem li2 = ListBox2.Items[i];

if (li2.Selected)
{
ListItem li = new ListItem(li2.Text, li2.Value);
ListBox.Items.Add(li);
ListBox2.Items.RemoveAt(i);
}
}

// sort listbox1 items by Text property

SortListBox(ListBox1);

// code for Sort method using LINQ

protected void SortListBox(ListBox lb)
{
var sorted = from ListItem li in lb.Items orderby li.Text select li;
lb.Items.Clear();
lb.Items.AddRange(sorted.ToArray());
}
Vulpes11y ago
As a desktop developer, ASP.NET is not really my field either but is it something like this that you're trying to do?

http://www.devcurry.com/2009/03/bind-arraylist-with-hyperlinks-to.html
jacob lee11y ago
Good job!I learn much from you.Now i have another question,how to bind arrays to GridView in asp.net?I am not good at the filed of asp.net.
I know that you can use exclamation sign to bind array of simple types (like string) to GridView like this:

But this doesn't seem to be the case with DataNavigateUrlFields

And I get following error:
A field or property with the name '!' was not found on the selected data source.
Can you help me?
samanta12y ago
Thank you sir

i got the solution
samanta12y ago
i want to add selected items of listbox1 to listbox2.

i am loading listbox1 items from darabase and its sorted by name.

once i remove items from listbox2, all removed items must be added back to listbox1 and listbox1 must be sorted.
Vulpes12y ago
Just to be clear here, are you saying that you want to copy all listbox1's items to listbox2 (via the array) or only the selected items?

If it's the latter, can more than one item be selected at once?
samanta12y ago
okay sir.

once i added selected items from listbox1 to listbox2, selected listbox1 items must be removed.
and once i removed items from listbox2 all removed items must be added to listbox1 with sorted order.
how to do that.
Vulpes12y ago
To add the contents of the array to ListBox2, you can do:

int count = vta.GetLength(1);
ListBox2.Items.Clear(); // if necessary

for(int i = 0; i < count; i++)
{
ListItem li = new ListItem(vta[1,i], vta[0,i]);
ListBox2.Items.Add(li);
}
samanta12y ago
thanks for your reply.

okay that's correct and now i want to add this 2D array to another listbox.
how can i do that please help me
Vulpes12y ago
If I've understood it correctly, try this code:

int count = ListBox1.Items.Count;
string[,] vta = new string[2, count];

for(int i = 0; i < count; i++)
{
vta[0,i] = ListBox1.Items[i].Value;
vta[1,i] = ListBox1.Items[i].Text;
}