Is this a bug in vb.net asp.net with listbox

on a web page add    ListBox1 and Button1

on page load add
ListBox1.Items.Add((New ListItem("A", "1")))
ListBox1.Items.Add((New ListItem("B", "2")))
ListBox1.Items.Add((New ListItem("C", "2")))
ListBox1.Items.Add((New ListItem("D", "2")))

On Button1_click add two lines
Dim X as string
X=ListBox1.SelectedItem.Text

If you select item C or D from    listbox1     then  click on  Button1   as a result    ListBox1.SelectedItem.Text   will return    "B"

Is this a bug in vb.net asp.net or it is normal?
saljasAsked:
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Obadiah ChristopherCommented:
Since the value of B, C, D is 2,

X=ListBox1.SelectedItem.Text will return the text of the first item that was added to the list. In this case it is B. This is expected behavior.
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saljasAuthor Commented:
It is expected behavior,   is it a bug?
because The returned selected text is (not) the selected text
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saljasAuthor Commented:
in other words, if you have a list of 20,000 items then you never know if the returned selectedtext is the right one or no

Also programmers will not use the listbox because they can not guarantee that the value is unique.

Also it is not logical to add only the items that has no similar values and leave others behind!!!
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Obadiah ChristopherCommented:
--> It's not a bug. It is how all lists behave in programming languages.(atleast in .Net). Try to create a List object and add these items and then try to retrieve it by keyvalue.
--> It is not logical and bad design to add items that have the same value. If this is coming from a database table, the table must be having a primary key. Add the primary key of the table for the value column.
--> If you still need the column, do something like this.

ListBox1.Items.Add((New ListItem("A~1", "1")))
ListBox1.Items.Add((New ListItem("B~2", "2")))
ListBox1.Items.Add((New ListItem("C~2", "3")))
ListBox1.Items.Add((New ListItem("D~2", "4")))

Dim X as string
X=ListBox1.SelectedItem.Text.Split('~')(0)

Open in new window


--> Programmers use Listbox. They just don't have the need to load 20,000 items or to add items that have the same value.
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saljasAuthor Commented:
Thank you Mr. Obadiah Christopher

This line solved the issue,

If this is coming from a database table, the table must be having a primary key. Add the primary key of the table for the value column.
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