Dynamically creating array of controls

[Bhavin]

Anybody quickly replies it, would be a great help!

I try to create dynamic array of textboxes control in ASP.NET(C#). I got the
following error while I tried to assign value to ID property of dynamically
created textbox. (look at my code please )

Error: “ Object reference is not set to an instance of Object”

totalRows – int variable which varies with number of records in SQL table

Textbox[]txbox = new Textbox [totalRows];

For (int i=0; i < totalRows; i++)
{

txbox[i].ID = “myTextbox” ; //Getting error here

}

Thanks,

[[Alan Flores]]

RE: Dynamically creating array of controls

an id is a unique identifier, it seems you are passing the same value to all
of the controls.. try this..[color=blue]
> For (int i=0; i < totalRows; i++)
> {
>
> txbox[i].ID = “myTextbox” + i;
>
> }[/color]


"Bhavin" wrote:
[color=blue]
> Anybody quickly replies it, would be a great help!
>
> I try to create dynamic array of textboxes control in ASP.NET(C#). I got the
> following error while I tried to assign value to ID property of dynamically
> created textbox. (look at my code please )
>
> Error: “ Object reference is not set to an instance of Object”
>
> totalRows – int variable which varies with number of records in SQL table
>
> Textbox[]txbox = new Textbox [totalRows];
>
> For (int i=0; i < totalRows; i++)
> {
>
> txbox[i].ID = “myTextbox” ; //Getting error here
>
> }
>
> Thanks,[/color]

[Bhavin]

RE: Dynamically creating array of controls

Do you know how can I capture values from dynamically created controls?

"[Alan Flores]" wrote:
[color=blue]
> an id is a unique identifier, it seems you are passing the same value to all
> of the controls.. try this..[color=green]
> > For (int i=0; i < totalRows; i++)
> > {
> >
> > txbox[i].ID = “myTextbox” + i;
> >
> > }[/color]
>
>
> "Bhavin" wrote:
>[color=green]
> > Anybody quickly replies it, would be a great help!
> >
> > I try to create dynamic array of textboxes control in ASP.NET(C#). I got the
> > following error while I tried to assign value to ID property of dynamically
> > created textbox. (look at my code please )
> >
> > Error: “ Object reference is not set to an instance of Object”
> >
> > totalRows – int variable which varies with number of records in SQL table
> >
> > Textbox[]txbox = new Textbox [totalRows];
> >
> > For (int i=0; i < totalRows; i++)
> > {
> >
> > txbox[i].ID = “myTextbox” ; //Getting error here
> >
> > }
> >
> > Thanks,[/color][/color]

[Angelos Karantzalis]

Re: Dynamically creating array of controls

When you create an array of objects, the objects inside it are NOT
initialized ! In other owrd, it's an array of null values mate ... change
your code to this:

Textbox[] txbox = new Textbox [totalRows];

for(int i=0; i < totalRows; i++){
txbox[i] = new Textbox();
txbox[i].ID = "myTextbox" +i;
}

Angel
O:]




"Bhavin" <Bhavin@discuss ions.microsoft. com> wrote in message
news:15E5AB6B-89B2-421A-BD36-B93AF5FBA317@mi crosoft.com...[color=blue]
> Anybody quickly replies it, would be a great help!
>
> I try to create dynamic array of textboxes control in ASP.NET(C#). I got[/color]
the[color=blue]
> following error while I tried to assign value to ID property of[/color]
dynamically[color=blue]
> created textbox. (look at my code please )
>
> Error: " Object reference is not set to an instance of Object"
>
> totalRows - int variable which varies with number of records in SQL table
>
> Textbox[]txbox = new Textbox [totalRows];
>
> For (int i=0; i < totalRows; i++)
> {
>
> txbox[i].ID = "myTextbox" ; //Getting error here
>
> }
>
> Thanks,[/color]

[Bhavin]

Re: Dynamically creating array of controls


Thanks a lot Angel. It worked(But next problem)

Textbox[] txbox = new Textbox [totalRows];

for(int i=0; i < totalRows; i++){
txbox[i] = new Textbox();
txbox[i].ID = "myTextbox" +i;
}

I used above code in my page_load event. It worked. But once all dynamic
empty textboxes got created I entered values in them. Now I want to capture
those values using dynamic IDs of textboxes but those IDs no longer available
after page_load event. I would like to capture all values from textboxes to
INSERT data in SQL table.



"Angelos Karantzalis" wrote:
[color=blue]
> When you create an array of objects, the objects inside it are NOT
> initialized ! In other owrd, it's an array of null values mate ... change
> your code to this:
>
> Textbox[] txbox = new Textbox [totalRows];
>
> for(int i=0; i < totalRows; i++){
> txbox[i] = new Textbox();
> txbox[i].ID = "myTextbox" +i;
> }
>
> Angel
> O:]
>
>
>
>
> "Bhavin" <Bhavin@discuss ions.microsoft. com> wrote in message
> news:15E5AB6B-89B2-421A-BD36-B93AF5FBA317@mi crosoft.com...[color=green]
> > Anybody quickly replies it, would be a great help!
> >
> > I try to create dynamic array of textboxes control in ASP.NET(C#). I got[/color]
> the[color=green]
> > following error while I tried to assign value to ID property of[/color]
> dynamically[color=green]
> > created textbox. (look at my code please )
> >
> > Error: " Object reference is not set to an instance of Object"
> >
> > totalRows - int variable which varies with number of records in SQL table
> >
> > Textbox[]txbox = new Textbox [totalRows];
> >
> > For (int i=0; i < totalRows; i++)
> > {
> >
> > txbox[i].ID = "myTextbox" ; //Getting error here
> >
> > }
> >
> > Thanks,[/color]
>
>
>[/color]

[Angelos Karantzalis]

Re: Dynamically creating array of controls

You could just store those controls in a member variable in your page class,
and check on them, getting their .Text property.

.... or, when you create them, you could add an event handler for their
OnChange event, adn get the values that way

.... or, you could even loop inside the page's controls collection and find
them through there !

... or I could just keep writing. I think the first or second suggestion
will work fine :]

Angel
O:]


"Bhavin" <Bhavin@discuss ions.microsoft. com> wrote in message
news:2265EDA7-2CD1-48B4-93AD-98EDE920E6E1@mi crosoft.com...[color=blue]
>
> Thanks a lot Angel. It worked(But next problem)
>
> Textbox[] txbox = new Textbox [totalRows];
>
> for(int i=0; i < totalRows; i++){
> txbox[i] = new Textbox();
> txbox[i].ID = "myTextbox" +i;
> }
>
> I used above code in my page_load event. It worked. But once all dynamic
> empty textboxes got created I entered values in them. Now I want to[/color]
capture[color=blue]
> those values using dynamic IDs of textboxes but those IDs no longer[/color]
available[color=blue]
> after page_load event. I would like to capture all values from textboxes[/color]
to[color=blue]
> INSERT data in SQL table.
>
>
>
> "Angelos Karantzalis" wrote:
>[color=green]
> > When you create an array of objects, the objects inside it are NOT
> > initialized ! In other owrd, it's an array of null values mate ...[/color][/color]
change[color=blue][color=green]
> > your code to this:
> >
> > Textbox[] txbox = new Textbox [totalRows];
> >
> > for(int i=0; i < totalRows; i++){
> > txbox[i] = new Textbox();
> > txbox[i].ID = "myTextbox" +i;
> > }
> >
> > Angel
> > O:]
> >
> >
> >
> >
> > "Bhavin" <Bhavin@discuss ions.microsoft. com> wrote in message
> > news:15E5AB6B-89B2-421A-BD36-B93AF5FBA317@mi crosoft.com...[color=darkred]
> > > Anybody quickly replies it, would be a great help!
> > >
> > > I try to create dynamic array of textboxes control in ASP.NET(C#). I[/color][/color][/color]
got[color=blue][color=green]
> > the[color=darkred]
> > > following error while I tried to assign value to ID property of[/color]
> > dynamically[color=darkred]
> > > created textbox. (look at my code please )
> > >
> > > Error: " Object reference is not set to an instance of Object"
> > >
> > > totalRows - int variable which varies with number of records in SQL[/color][/color][/color]
table[color=blue][color=green][color=darkred]
> > >
> > > Textbox[]txbox = new Textbox [totalRows];
> > >
> > > For (int i=0; i < totalRows; i++)
> > > {
> > >
> > > txbox[i].ID = "myTextbox" ; //Getting error here
> > >
> > > }
> > >
> > > Thanks,[/color]
> >
> >
> >[/color][/color]

[Dan]

Re: Dynamically creating array of controls

Angelos - Can you translate into vb.net? - Can you direct me to a newsgroup
that might if not?

Thanks

Dan

"Angelos Karantzalis" wrote:
[color=blue]
> When you create an array of objects, the objects inside it are NOT
> initialized ! In other owrd, it's an array of null values mate ... change
> your code to this:
>
> Textbox[] txbox = new Textbox [totalRows];
>
> for(int i=0; i < totalRows; i++){
> txbox[i] = new Textbox();
> txbox[i].ID = "myTextbox" +i;
> }
>
> Angel
> O:]
>
>
>
>
> "Bhavin" <Bhavin@discuss ions.microsoft. com> wrote in message
> news:15E5AB6B-89B2-421A-BD36-B93AF5FBA317@mi crosoft.com...[color=green]
> > Anybody quickly replies it, would be a great help!
> >
> > I try to create dynamic array of textboxes control in ASP.NET(C#). I got[/color]
> the[color=green]
> > following error while I tried to assign value to ID property of[/color]
> dynamically[color=green]
> > created textbox. (look at my code please )
> >
> > Error: " Object reference is not set to an instance of Object"
> >
> > totalRows - int variable which varies with number of records in SQL table
> >
> > Textbox[]txbox = new Textbox [totalRows];
> >
> > For (int i=0; i < totalRows; i++)
> > {
> >
> > txbox[i].ID = "myTextbox" ; //Getting error here
> >
> > }
> >
> > Thanks,[/color]
>
>
>[/color]