Visual Basic

Add value and text in combobox

23-Dec-07 14:05

I've seen people ignore this message and continue on without any adverse affects.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

yesu prakash15-Dec-07 21:28

Re: Add value and text in combobox

15-Dec-07 21:28

How can i add a text and a corresponding value for it?
When i fill date to a combox from database,i need to get the corresponding value ie primary key of the selected text when i select a item from combobox.

Thanks
Yesu

Bassam Saoud16-Dec-07 1:58

Bassam Saoud

16-Dec-07 1:58

Each Item of a combobox have Text and Value associated.For example

Dim oItem As ListItem = New ListItem()
oItem.Text = "your text"
oItem.Value = "Some ID"

you can use the SelectedValue property of a drop down to get the selected value

Assinging values to Array

sjs4u15-Dec-07 21:01

sjs4u

15-Dec-07 21:01

Hi,

I have one query that

"SELECT Incharge_Name, COUNT(Incharge_Name) AS [Incharge Name] FROM t_Showroom GROUP BY Incharge_Name"

I declare two arrays

Dim arrValues1() As Integer
Dim arrLabels1() As String

Now I have to assign values of Incharge_Name(int value) to arrValues1 array and Incharge_Name to arrLabels1 array

I am using dataset to retrive the value

Thanks,
sjs4u

Re: Assinging values to Array

Bassam Saoud16-Dec-07 2:05

Bassam Saoud

16-Dec-07 2:05

All you have to do is loop that DataTable in your Dataset and assign the values to your array.

Here a link on how to work with arrays [^]

Late Binding Issue

Georg Kohler15-Dec-07 18:25

Georg Kohler

15-Dec-07 18:25

Can Somebody help me here Smile | :)

I have written an application for two different motion controllers
- The code for each controller is placed in it's own module with identical
subs

Depending on the controller selected it will execute the appropriate code

Here is the problem .. after setting the project to OPTION STRICT = ON
I get the late binding not allowed message and I just can not get it fixed Smile | :)

Below is a sample code that should help understand my issue easier (I l know it's an easy thing - I just can not figure it out)

It's important for me that the Variable [SelectedController] that holds the object to the selected module is accessible throughout the whole project !
PS the code below doesn’t work = The variable [SelectedController] is not accessible outside the subs !

Where I try to call the actual subroutine is where I get the late binding error
Example : SelectedController.test()
Thanks

Georg

Public Module DECLARE_VARAIBLES
Public SelectedController As Object ' selected controller
End Module

Public Class Form1
Public Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim SelectedController As New ControllerA
Display_Controller()
End Sub

Public Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim SelectedController As New ControllerB
Display_Controller()
End Sub

Private Sub Display_Controller()
'**************
' HERE IS WHERE I USUALLY RUN INTO MY LATE BINDING ISSUE
SelectedController.test()
End Sub
End Class

Public Class ControllerA
Public Sub test()
MsgBox("running Controller A")

End Sub
End class

Public Class ControllerB
Public Sub test()
MsgBox("running Controller B")

End Sub
End Class

Re: Late Binding Issue

CKnig16-Dec-07 18:36

CKnig

16-Dec-07 18:36

This is the normal - and desired - result if you try to invoke a method "test" on an boxed object ( indeed you are calling object.test() ).
If you have some classes that each implements the same methods you should use Interfaces like this:
Somewhere outside a class define:

<br />
Public Interface ITest<br />
 Sub test()<br />
End Interface<br />

and then in your classes (ControllerA and ControllerB):

<br />
Public Class ControllerA<br />
   Implements ITest<br />
Public Sub test()<br />
  MsgBox("running Controller A")<br />
End Sub<br />
End Class<br />

(ControllerB similar)

And finally in your Module:

<br />
Public Module DECLARE_VARAIBLES<br />
 Public SelectedController As ITest ' selected controller<br />
End Module<br />

-> you will get IntelliSense help and the code will work Wink | ;)

Re: Late Binding Issue

Georg Kohler16-Dec-07 19:47

Georg Kohler

16-Dec-07 19:47

I'm not sure if I'm getting this ...
Am i correct in that Interfaces are intended to be used for code that's exactly the same ?

Public Interface ITest
Sub test()
End Interface

Itest will be the same in both controllerA & controllerB

If this is how it works that that's NOT what I need

I have a user Interface that will call the subs inside to different classes, ControllerA or ControllerB (The SUB NAMES Inside the classes are identical but the code inside the subs will never be!)

I believe it would make my live a lot easier (and Cleaner to maintain ) if I could just call the "same" subs out of my user interface

Sub Jog_X()
SelectedController.jogging
' where SelectedControler.Jog_X will have to point to
'A) ControllerA.Jog_X
'or
'B) ControlerB.Jog_X
end sub

Georg

monitor clients on a network

NEO198615-Dec-07 8:49

NEO1986

15-Dec-07 8:49

Can anyone give me any idea on how to monitor client on a LAN through vb.net
the features like key logging and screenshots are working only on my system
plz tell me how to implement this on multiple systems

ListView

yesu prakash15-Dec-07 3:54

15-Dec-07 3:54

How can i save the values which is addes to a listview control. It may have more that one rows of data in a listview.Please help me with a example
Thanku
yesu

pmarfleet15-Dec-07 6:54

pmarfleet

15-Dec-07 6:54

ypki wrote:
How can i save the values which is addes to a listview control.

What do you mean by 'save'? To a file? A database?

You should provide enough information in your question for someone to be able to assist you with a solution.

Paul Marfleet

"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush

yesu prakash15-Dec-07 16:24

15-Dec-07 16:24

sorry..i mean to save in database

Thanks

yesu prakash15-Dec-07 16:28

15-Dec-07 16:28

sorry...i mean to save in database

for eg.

i have some textbox controls, after entering some values in it and hit enter,the values move to listview,more than one rows may enter into listview.There is another button, hiting on that the values in the listview need to save in the database.

Thanks
Yesu

Paul Conrad15-Dec-07 9:10

15-Dec-07 9:10

You need to provide more information as to how you want to save. You can save to a file or a database.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

yesu prakash15-Dec-07 16:28

15-Dec-07 16:28

sorry..i mean to save in database

for eg.

i have some textbox controls, after entering some values in it and hit enter,the values move to listview,more than one rows may enter into listview.There is another button, hiting on that the values in the listview need to save in the database.

Thanks
Yesu

Paul Conrad16-Dec-07 1:58

16-Dec-07 1:58

You just do an insert query into your database, however it is set up. Then, when you run the app again, you query for those items in your listbox and populate it from the query results.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

yesu prakash16-Dec-07 2:25

16-Dec-07 2:25

but i am not getting the value to insert.
i use
Dim lstSel As ListViewItem
lstSel.SubItems(2).ToString and val(lstSel.SubItems(2).ToString)
to take value from the cells of the listview.
only string value is getting for insert.

thks
yesu

Paul Conrad23-Dec-07 14:06