Visual Basic

5-Feb-07 7:29

In this event of combobox1 'combobox1_selectedindexchanged' determine which was selected and call the appropriate routine to load/replace the contents of combobox2.

Re: ComboBox Help

Jason Baggett5-Feb-07 7:40

Jason Baggett

5-Feb-07 7:40

Thanks.
I hate to ask too much, but I am rusty (2 years since coding of any form). Could you please explain "which was selected and call the appropriate routine to load/replace the contents of combobox2"?
I appreciate the help.

Re: ComboBox Help

nlarson115-Feb-07 7:51

Datagridview Rowheaderselect

5-Feb-07 7:51

When the event fires, you need to check combo1 for what the user selected. Then react accordingly. There are 3 properties you can check to do this. Once you know what they selected, then call the appropriate routine to load the correct values in combo2 that belong to the selection they made in combo1

the properties:

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Select Case ComboBox1.SelectedIndex 'if you hardcoded the contents of combo1
Case 0
Call FillCombo2WithATypes()
Case 1
Call FillCombo2WithBtypes()
End Select

Select Case ComboBox1.SelectedText 'what they see in the combo list
Case "A - type "
Call FillCombo2WithATypes()
Case "B - type "
Call FillCombo2WithBtypes()
End Select

Select Case ComboBox1.SelectedValue 'the code for what they see
Case "A"
Call FillCombo2WithATypes()
Case "B"
Call FillCombo2WithBtypes()
End Select
End Sub

Nikila Venkat5-Feb-07 5:20

Nikila Venkat

5-Feb-07 5:20

I am using windows datagridview. I have added datagridtextboxcolumn as first column and the next column and remaining columns are from database. When I run the application 2nd column is highlighted, instead of first column. I want to highlight first column. I am using "Row header selection mode". I think this behaves when row header selected then selects entire row otherwise it behaves like "cell select" mode which selects the cell. Since I am adding datagridtextboxcolumn as my first column , it is highlighting 2nd column. Please advise how to select first column i.e datagridtextbox column instead of 2nd row. Also, I still need rowheader selection mode.

I appreciate your help!

Thanks,
Nilika

creating a playlist

jady845-Feb-07 5:09

jady84

5-Feb-07 5:09

Hi All,

I want to create a playlist in WMP, so that the user can click "next" to go to the next video clip and "previous" to go back.

Could anybody advise me on 'HOW' to do this? or direct me to a tutorial. Ive searched the web and cannot find one.

Thanks in Advance.

Jaidev

a problem in array in vb.net

Hasan Jaffal5-Feb-07 3:55

5-Feb-07 3:55

i use arrays in vb.net
but i have a problem in the dimension
ex :
dim a() as integer
a(0)=new integer

gives error

i don't want to use arraylist because i dound inutil to do the cast

Kschuler5-Feb-07 5:19

Kschuler

5-Feb-07 5:19

Could you display your real code please? What are you really setting a(0) equal to? I mean, you are not actually setting it to New Integer right? You are setting it to an actual value? And what is the error that you are getting?

Hasan Jaffal5-Feb-07 5:23

5-Feb-07 5:23

i'm defining a vector without defining its size
so when i make new to allocate in memory
i get the eror : not set to an instance

Kschuler5-Feb-07 5:39

Kschuler

5-Feb-07 5:39

I haven't been able to get through this error without defining the size of the array upfront. If you are using Visual Studio 2005 you can use a List object instead. It is like an ArrayList except that you must declare what type of objects are being listed, so you will not have to worry about the overhead of casting the objects into what you want. Here's how you declare it:

Dim objList As New List(Of Integer)

Hope this helps.

nlarson115-Feb-07 5:35

5-Feb-07 5:35

dim a() as integer

array.Resize(a,0) ' or redim preserve a(0)

a(0) = 9999

Hasan Jaffal5-Feb-07 12:00

5-Feb-07 12:00

thanks
that's work
now i have a bigger question
if a fuction return a vector
public function f() as integer ()

dim a() as integer
redim preserve a(0)
redim preserve a(1)
a(0)=1
a(1)=0
return a
end function

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

dim k () as integer
k=f()
msgbox(k(0)) ------->gives error : not set to instance

nlarson115-Feb-07 12:22

5-Feb-07 12:22

1) if you know how many you'll have you can do a 'static' array

dim a(1) as integer 'creates 0 both instances 0 and 1

2) you don't need to do a redim twice if you know how big you want to make it.

redim preserve a(1) 'will create both instances 0 and 1

3) ran you code... ran fine for me...???

Hasan Jaffal5-Feb-07 12:53

5-Feb-07 12:53

man thanks but
the problem is when the functon return the vector ...
it allways be null

TwoFaced5-Feb-07 15:29

TwoFaced

5-Feb-07 15:29

Maybe you should post a bigger junk of code or help explain the situation in further detail . I tested your code also and it works perfectly. Something else has to be going on.

Global Dataset

liona5-Feb-07 2:42

liona

5-Feb-07 2:42

I am using Visual Studio 2003. I am wondering if I can have a global dataset.

The ideal thing I would want is when someone opens this web application I would want the app then to connect to the database and haul down a table to be stored in a dataset. Then I want to be able to use this dataset anywhere in my application.

Reason I am asking is that I will need to refer to this table numerous times over the run of the application and rather than having numerous connections or leaving open a connection I would rather store the dataset in a global variable for quick use.

Re: Global Dataset

Kschuler5-Feb-07 5:25

Kschuler

5-Feb-07 5:25

If you are working with a web app I'm not sure a global dataset is the solution. You are going to have all kinds of problems when multiple users access it at the same time. A global variable in a web project is a single variable for everyone who uses it...not a variable for a single user on a single session. I would suggest that instead you make a global method to run queries/procedures to your database. In these global methods you can include the code to open and close a single connection so you will always be sure to only have one open and you will not leave it open when you are not using it.

I hope this helps.

Re: Global Dataset

nlarson115-Feb-07 5:38