Iterating through a ListBox in VB.NET VS 2005

[Henry Jones]

I have a listbox on a Windows form and it is bound using the following code:

objListBox.Data Source = tbl

objListBox.Disp layMember = "ContactNam e"

objListBox.Valu eMember = "ContactID"

------------------------------------

On my form, I have a multi-select listbox and I would like to select a few
items. So If my listbox contains: CA, NV, OR, WA, AZ

and I choose CA and NV,



How can I get get those items?

I tried something like

dim itm as object

for each itm in objlistbox.sele cteditems

console.writeli ne(itm)

next



but it doesn't work. Why is this so hard to get the selected items in a
listbox?



Thanks

[Patrick Steele]

Re: Iterating through a ListBox in VB.NET VS 2005

In article <#dG2BOl7GHA.12 56@TK2MSFTNGP04 .phx.gbl>, henry@yada.com
says...

I have a listbox on a Windows form and it is bound using the following code:
>
objListBox.Data Source = tbl
>
objListBox.Disp layMember = "ContactNam e"
>
objListBox.Valu eMember = "ContactID"
>
------------------------------------
>
On my form, I have a multi-select listbox and I would like to select a few
items. So If my listbox contains: CA, NV, OR, WA, AZ
>
and I choose CA and NV,
>
>
>
How can I get get those items?
>
I tried something like
>
dim itm as object
>
for each itm in objlistbox.sele cteditems
>
console.writeli ne(itm)
>
next
>
>
>
but it doesn't work.

What do you mean "it doesn't work"? Do you get an error?

--
Patrick Steele

http://weblogs.asp.net/psteele

[Henry Jones]

Re: Iterating through a ListBox in VB.NET VS 2005

I get the following error:
Argument 'Prompt' cannot be converted to type 'String'.

but I have tried other things and they don't work also.

For example I tried console.writeli ne(objlist.sele cteditem) and tried to
list objlist.text and many other things but just can't display the State or
it's value.

If I could see some working code on how to do this that would be great. I'm
not necessarily in need of fixing what I have, I would like to get an
example of something that someone already has that works.

Thanks.


"Patrick Steele" <patrick@mvps.o rgwrote in message
news:MPG.1f989a cbef6948db9896b 0@msnews.micros oft.com...

In article <#dG2BOl7GHA.12 56@TK2MSFTNGP04 .phx.gbl>, henry@yada.com
says...

>I have a listbox on a Windows form and it is bound using the following
>code:
>>
>objListBox.Dat aSource = tbl
>>
>objListBox.Dis playMember = "ContactNam e"
>>
>objListBox.Val ueMember = "ContactID"
>>
>------------------------------------
>>
>On my form, I have a multi-select listbox and I would like to select a
>few
>items. So If my listbox contains: CA, NV, OR, WA, AZ
>>
>and I choose CA and NV,
>>
>>
>>
>How can I get get those items?
>>
>I tried something like
>>
>dim itm as object
>>
>for each itm in objlistbox.sele cteditems
>>
>console.writel ine(itm)
>>
>next
>>
>>
>>
>but it doesn't work.

>
What do you mean "it doesn't work"? Do you get an error?
>
--
Patrick Steele
http://weblogs.asp.net/psteele

[Stephany Young]

Re: Iterating through a ListBox in VB.NET VS 2005

You are on the right track, but you have to remember that the SelectedItems
collection is a collection of ListItems.

Each selected item is a ListItem that contains a string and therfore you
need to 'turn' the ListItem into a string before you can display the correct
value.

console.writeli ne(ctype(itm, string))


"Henry Jones" <henry@yada.com wrote in message
news:%23dG2BOl7 GHA.1256@TK2MSF TNGP04.phx.gbl. ..

>I have a listbox on a Windows form and it is bound using the following
>code:
>
objListBox.Data Source = tbl
>
objListBox.Disp layMember = "ContactNam e"
>
objListBox.Valu eMember = "ContactID"
>
------------------------------------
>
On my form, I have a multi-select listbox and I would like to select a few
items. So If my listbox contains: CA, NV, OR, WA, AZ
>
and I choose CA and NV,
>
>
>
How can I get get those items?
>
I tried something like
>
dim itm as object
>
for each itm in objlistbox.sele cteditems
>
console.writeli ne(itm)
>
next
>
>
>
but it doesn't work. Why is this so hard to get the selected items in a
listbox?
>
>
>
Thanks
>
>

[Kerry Moorman]

Re: Iterating through a ListBox in VB.NET VS 2005

Henry,

This works for me in VS2003:

for each itm as DataRowView in objlistbox.sele cteditems

console.writeli ne(itm("Contact Name"))

next

Kerry Moorman


"Henry Jones" wrote:

I get the following error:
Argument 'Prompt' cannot be converted to type 'String'.
>
but I have tried other things and they don't work also.
>
For example I tried console.writeli ne(objlist.sele cteditem) and tried to
list objlist.text and many other things but just can't display the State or
it's value.
>
If I could see some working code on how to do this that would be great. I'm
not necessarily in need of fixing what I have, I would like to get an
example of something that someone already has that works.
>
Thanks.
>
>
"Patrick Steele" <patrick@mvps.o rgwrote in message
news:MPG.1f989a cbef6948db9896b 0@msnews.micros oft.com...

In article <#dG2BOl7GHA.12 56@TK2MSFTNGP04 .phx.gbl>, henry@yada.com
says...

I have a listbox on a Windows form and it is bound using the following
code:
>
objListBox.Data Source = tbl
>
objListBox.Disp layMember = "ContactNam e"
>
objListBox.Valu eMember = "ContactID"
>
------------------------------------
>
On my form, I have a multi-select listbox and I would like to select a
few
items. So If my listbox contains: CA, NV, OR, WA, AZ
>
and I choose CA and NV,
>
>
>
How can I get get those items?
>
I tried something like
>
dim itm as object
>
for each itm in objlistbox.sele cteditems
>
console.writeli ne(itm)
>
next
>
>
>
but it doesn't work.

What do you mean "it doesn't work"? Do you get an error?

--
Patrick Steele
http://weblogs.asp.net/psteele

>
>
>

[Stephany Young]

Re: Iterating through a ListBox in VB.NET VS 2005

Sorry, I didn't read you post properly.

Because your ListBox is bound, each item is a reference to a row in tbl.

In this case you need to use SelectedIndicie s instead of SelectedItems and
retrieve the value from tbl:

For _i as Integer = 0 to objlistbox.Sele ctedIndicies.Co unt
Console.WriteLi ne(tbl.Rows(obj listbox.Selecte dIndicies(_i))( "ContactNam e"))
Next

Each item in SelectedIndicie s effectively gives you the row number in the
source.


"Henry Jones" <henry@yada.com wrote in message
news:%23dG2BOl7 GHA.1256@TK2MSF TNGP04.phx.gbl. ..

>I have a listbox on a Windows form and it is bound using the following
>code:
>
objListBox.Data Source = tbl
>
objListBox.Disp layMember = "ContactNam e"
>
objListBox.Valu eMember = "ContactID"
>
------------------------------------
>
On my form, I have a multi-select listbox and I would like to select a few
items. So If my listbox contains: CA, NV, OR, WA, AZ
>
and I choose CA and NV,
>
>
>
How can I get get those items?
>
I tried something like
>
dim itm as object
>
for each itm in objlistbox.sele cteditems
>
console.writeli ne(itm)
>
next
>
>
>
but it doesn't work. Why is this so hard to get the selected items in a
listbox?
>
>
>
Thanks
>
>

[Henry Jones]

Thanks for the replies

Thanks for the code to iterate through the listbox. Your suggestions
worked!

H


"Henry Jones" <henry@yada.com wrote in message
news:%23dG2BOl7 GHA.1256@TK2MSF TNGP04.phx.gbl. ..

>I have a listbox on a Windows form and it is bound using the following
>code:
>
objListBox.Data Source = tbl
>
objListBox.Disp layMember = "ContactNam e"
>
objListBox.Valu eMember = "ContactID"
>
------------------------------------
>
On my form, I have a multi-select listbox and I would like to select a few
items. So If my listbox contains: CA, NV, OR, WA, AZ
>
and I choose CA and NV,
>
>
>
How can I get get those items?
>
I tried something like
>
dim itm as object
>
for each itm in objlistbox.sele cteditems
>
console.writeli ne(itm)
>
next
>
>
>
but it doesn't work. Why is this so hard to get the selected items in a
listbox?
>
>
>
Thanks
>
>