Error "Object reference not set to an instance of an object" - Visual Basic Discussion Boards

Re: Error "Object reference not set to an instance of an object"

Guffa18-Oct-07 4:46

Guffa

18-Oct-07 4:46

MSDN Library: Thread class[^]

---
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Re: Error "Object reference not set to an instance of an object"

Dan Suthar18-Oct-07 6:48

Dan Suthar

18-Oct-07 6:48

Thanks A lot for help. That's All Worked Fine Now Wink | ;)

Dan

calling camera application in .net

Ahamed Azeem17-Oct-07 22:26

Ahamed Azeem

17-Oct-07 22:26

Dear Friends,

I am going to do one mobile application project in dot net. I will have to call camera application through my application. Can any one help me how to do it?

I will appreciate you if you send me a code snippet for doing this

Thank you

Best Regards
Ahamed Azeem

Re: calling camera application in .net

svanwass18-Oct-07 9:00

svanwass

18-Oct-07 9:00

No details on your problem typically returns no results.

Re: calling camera application in .net

Ahamed Azeem19-Oct-07 20:40

Ahamed Azeem

19-Oct-07 20:40

Hi,

I will have to do design an application which should activate camera application in pocket pc 2003.

I have found that there is a namespace in .net 2005 that "Microsoft.WindowsMobile.Forms" through MSDN. But When i try Add Reference, Its not available in the collection of dlls. but Is it anyway to get it back.

In Recent mobile we have a camera application like this I need to develop for my own and it should run in Pocket PC 2003 mobiles. And i will type a filename to store it into the folder.

I think this time you got an idea.

Regards
Azeem

Timer problem

Benny_Lava17-Oct-07 22:09

Benny_Lava

17-Oct-07 22:09

Hi,

I have an array of times(in miliseconds). I need to loop through the array and activate the dsrEnable method on serial port for exactly ethe time in the array and then disable the dsrEnable and move on to the next item in the array. The time has to be exact in a milisecond.

I have tried using a timer, but that is not precise, at all.

Do you know any other precise methods besides timer?

Thank you!!

Re: Timer problem

Luc Pattyn17-Oct-07 22:40

Luc Pattyn

17-Oct-07 22:40

Hi, you could find more information on this subject in my timer article. See link below.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google

Error "Object reference not set to an instance of an object"

Dan Suthar17-Oct-07 21:31

Dan Suthar

17-Oct-07 21:31

Hi,
I am just tired getting this error "Object reference not set to an instance of an object" in my project. I know that to solve this error you can use New keyword but I don't think that "new" can be used with Thread. Some code is as follows:

Private thrDownload As Thread

<br />
'''''' Some code is here'''''''''''''<br />
'<br />
'<br />
'<br />
'Now On This line I am getting an error :<br />
<br />
thrDownload.Start(0)<br />
<br />
' Or On thrDownload.Pause(0) & thrDownload.Stop(0) the same error !<br />
'<br />
'<br />
'<br />
'<br />
'''''' Some code is here'''''''''''''<br />
<br />

If anyone wants then I can paste the whole code here but It's lots of lines of code ! :->

Any Suggestions ? D'Oh! | :doh:

Thanks,
Dan

Re: Error "Object reference not set to an instance of an object"

Guffa17-Oct-07 21:47

Guffa

17-Oct-07 21:47

Dan`M wrote:
I know that to solve this error you can use New keyword but I don't think that "new" can be used with Thread.

Yes, it can. You have to create the Thread object before you can use it.

Re: Error "Object reference not set to an instance of an object"

Dan Suthar17-Oct-07 21:52

Dan Suthar

17-Oct-07 21:52

sorry but can you show some example code please.. :->

Filter your datagrid through text in a combobox/textbox

blonkie17-Oct-07 21:27

blonkie

17-Oct-07 21:27

Yo,

I have an datagrid where I want to filter my data I got.
The filter I want to use is the text inside an combobox or textbox (it doesn't matter)

This is the code I already have

Private Sub cmbPO_textChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmbPO.SelectedValueChanged
Me.TblLijstBindingSource.Position = Me.cmbPO.SelectedIndex
End Sub

Where:
cmbPO = combobox
tblLijstBindingSource = binding source

This doesn't works like I want it, I want to see just the record I've insert in the combobox. But if this is to hard to do, it may just jump to that record.

Thanks

(Plz keep in VB.NET and do not throw code of C# or such a languages :->)

Re: Filter your datagrid through text in a combobox/textbox

C1AllenS18-Oct-07 2:04

C1AllenS

18-Oct-07 2:04

Hello,

To achieve this, you would have to use the filter property for the binding source. You will have
to specifically put the filter condition on the field whose value you will enter in the Text box.

You can use the following code in the TextChanged event of the Combobox or the Text Box:

Private Sub ComboBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.TextChanged<br />
<br />
        Me.TblLijstBindingSource.Filter = "<Column Name> ='" & Me.ComboBox1.Text & "'"<br />
<br />
End Sub

I believe this should help.

Regards,
Allen

Allen Smith

Software Engineer
ComponentOne LLC
www.componentone.com

Re: Filter your datagrid through text in a combobox/textbox

blonkie18-Oct-07 3:04

blonkie

18-Oct-07 3:04

Thanks for your help but still got an error :

Syntax error: Missing operand before '=' operator.

Btw how do you search for a value who is in a datagrid who is dynamic created.
I mean how can you bind a dataset to the datagrid, and not the datagrid to the dataset.

Thanks

Access Key

brams717-Oct-07 15:37

brams7

17-Oct-07 15:37

Hi All,
This is the first time, am posting a query on any forum.
I've developed an application in which there is a hot key assigned to each button. In VB.Net I came to know there is no need to press Alt to activate the hot key which is known as an Access key (correct me if am wrong). But problem is like this when my application is open and control is on my application and by mistake if I pressed any button for eg. on Exit button, I've written E&xit so it's a hot key when I pressed Alt+x, but according to Access key if I press 'x' then also it works as Alt+x and it takes me out of the application. So I wanted to deactivate the access key, it should work only when I pressed Alt+x.

Please advice me.

Re: Access Key

Abhijit Jana17-Oct-07 20:05

Abhijit Jana

17-Oct-07 20:05

Hi,
This will clear your doubts !!!! Smile | :)

http://www.thescripts.com/forum/thread226312.html[^]

Good luck Rose | [Rose]

Happy Programming
-----
Abhijit

load assembly from appdomain?

cstrader23217-Oct-07 11:41

cstrader232

17-Oct-07 11:41

Sorry to be a pain, but I just can’t find this:

I can load an assembly from a .dll:
Dim Asm As Assembly = System.Reflection.Assembly.LoadFrom("c:\test.dll”)

But then I can’t unload the assembly

So I tried:

Dim newDomainName As AppDomain = AppDomain.CreateDomain("newDomainName")

But NewDomainName doesn’t have a loadfrom method

How to create the assemblyref foo required as the argument in:

newDomainName.Load(foo)

Thanks

Inserting a new row programatically in a bound datgridview

Mr Oizo17-Oct-07 11:33

Mr Oizo

17-Oct-07 11:33

hi well the title is pretty self explanotary.....I'm just trying to insert a row after the currently selected row in a datagridview programatically? anybody please help with this

Mr Oizo

Re: Inserting a new row programatically in a bound datgridview

Dave Kreskowiak17-Oct-07 15:28

Dave Kreskowiak

17-Oct-07 15:28

If the grid is bound to a datasource, you don't add the new row to the datagridview. You add it to the datasource, probably a DataTable. How you do that depends entirely on your datasource.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Sending Email without using Outlook

yogesh_kumar_agarwal17-Oct-07 8:22

yogesh_kumar_agarwal

17-Oct-07 8:22

Hi all i want to send the Email using VB6 but without using the Outlook Application how could i do that plz reply with code.

with regards

yogesh agarwal

Re: Sending Email without using Outlook

nlarson1117-Oct-07 8:59

nlarson11

17-Oct-07 8:59

look up either cdonts or cdosys dlls

Re: Sending Email without using Outlook

yogesh_kumar_agarwal17-Oct-07 10:34

yogesh_kumar_agarwal

17-Oct-07 10:34

Thanks for your reply but i tried a lot i could n't find the method how to use these DLL in my VB program to send the email could you help me out.

with regards

yogesh agarwal

Re: Sending Email without using Outlook

svanwass18-Oct-07 9:04

svanwass

18-Oct-07 9:04

Keep digging....

CDOSYS.dll
http://support.microsoft.com/kb/310212

CDONTS.dll
http://www.2enetworx.com/dev/projects/view.asp?ids=1,67,2

Re: Sending Email without using Outlook

GuyThiebaut17-Oct-07 9:03

GuyThiebaut

17-Oct-07 9:03

Check out Blat.

This is a freeware mail program that is command line driven - so you should be able to quite easily integrate it into your code.

I use this to automatically send out emails to suppliers notifying them of payment transfers.

You always pass failure on the way to success.

Re: Sending Email without using Outlook

yogesh_kumar_agarwal17-Oct-07 10:35

yogesh_kumar_agarwal

17-Oct-07 10:35

Thanks for your reply but i tried a lot i could n't find the method how to use the BLAT in my VB program to send the email could you help me out.

with regards

yogesh agarwal

Re: Sending Email without using Outlook

GuyThiebaut17-Oct-07 23:03

GuyThiebaut

17-Oct-07 23:03

I'm okay helping you with specific questions.

As a hint - you will need to use the shell to execute the blat commands as it is command line driven.

I don't consider just over one and a half hours, between my post and your reply, as worthy of the phrase:

yogesh_kumar_agarwal wrote:
tried a lot

.

Beyond this please be more specific with where you are stuck.

You always pass failure on the way to success.

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