asked on

Add item to ComboBox in VB.NET

I need to be able to add an itme to a ComboBox in VB.NET when it finds a particular item.

This example uses the TAPI devices available. So lets say I am looking for the H.323 item, how would I search for that one and populate it in the ComboBox if it is there? And of it is NOT there, populate the ComboBox with "NO DEVICE FOUND".

________________________________________________
For Each line In TAPI.Lines
ComboBox1.Items.Add(line.DeviceName)
Next line
________________________________________________

Any ideas?

This should be a simple one.

Bob Learned

Start with this:
Dim findItem As Integer = ComboBox1.FindString("H.323")

If findItem = -1 Then
ComboBox1.Items.Add("NO DEVICE FOUND")
End If

Bob

cjinsocal581

ASKER

So if it finds it, how do I populate it in the ComboBox by itself?

Bob Learned

Ok, maybe I am not understanding you.

Do you want to search for H.323 in TAPI.Lines, or the ComboBox?

Bob

cjinsocal581

ASKER

Sorry bout that.

I would want to search the TAPI.Lines for it then populate the ComboBox if it finds it. (Of course, if it doesn't, populate it with the "No Device Found")

Bob Learned

Is this better?

Private Sub SearchDevice(ByVal device As String)

For Each line In TAPI.Lines

If line = device Then
Me.ComboBox1.Items.Add(line.DeviceName)
Else
Me.ComboBox1.Items.Add("NO DEVICE FOUND")
End If

Next line

End Sub

Bob

cjinsocal581

ASKER

is device when I would declare the string to look for? (e.g. "H.323")

Bob Learned

Sorry,
Usage: SearchDevice("H.323")

Bob

cjinsocal581

ASKER

I am getting an error stating it is not producing a value. Here is what I have so far...

Dim line As TAPI.TAPILine
TAPI.initialize()
Dim device As String
device = SearchDevice("H.323")
For Each line In TAPI.Lines
If line = device Then
Me.ComboBox1.Items.Add(line.DeviceName)
Else
Me.ComboBox1.Items.Add("NO DEVICE FOUND")
End If
Next line

Bob Learned

Private Sub Initialize

TAPI.initialize()

SearchDevice("H.323")

End Sub

Private Sub SearchDevice(ByVal device As String)

For Each line In TAPI.Lines

If line = device Then
Me.ComboBox1.Items.Add(line.DeviceName)
Else
Me.ComboBox1.Items.Add("NO DEVICE FOUND")
End If

Next line

End Sub

Bob

cjinsocal581

ASKER

This is the error I get with the above code:

Operator '=' is not defined for types 'TAPI.TAPILine' and 'String'. Use 'Is' operator to compare two reference types.

Bob Learned

Private Sub SearchDevice(ByVal device As String)

For Each line In TAPI.Lines

If line.DeviceName = device Then
Me.ComboBox1.Items.Add(line.DeviceName)
Else
Me.ComboBox1.Items.Add("NO DEVICE FOUND")
End If

Next line

End Sub

cjinsocal581

ASKER

That took away the error, but now the ComboBox loads a bunch of "NO DEVICE FOUND" entries.

Bob Learned

Ok, enough is enough. I haven't spent enough time understanding you're explanation and implementation, and we'll just keep going around and around, and I don't really have time to do that.

What is the big picture here? What are you really trying to do?

Bob

cjinsocal581

ASKER

Sorry to have made this inconvenient for you but all I am trying to do is search the items in the lines, and if it finds "H.323" to add it to the combo box by itself and if it does not find it, to add NO DEVICE FOUND.

That is all.

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Bob Learned

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cjinsocal581

ASKER

Perfect. Thanks.