Reference ASP:Text Controls Programmatically

[Steve101]

I am sure that the answer to this is quite simple, but I am just not seeing it:

I have a number of text controls on a web page; for example:

<asp:TextBox ID="ETAC1" runat="server"></asp:TextBox>
<asp:TextBox ID="ETAC2" runat="server"></asp:TextBox>
<asp:TextBox ID="ETAC3" runat="server"></asp:TextBox>
<asp:TextBox ID="ETAC4" runat="server"></asp:TextBox>

Whilst I can happily reference these individually; for example:

ETAC1.Text = 10
ETAC2.Text = 20
ETAC3.Text = 30
ETAC4.Text = 40

I have not been able to figure how I can reference these controls programmatically. For example, I would like to do something like:

For i = 1 to 4
thisControlId = "ETAC" & i
Controls(ThisControlId).Text = i*10 ' <-----------
Next

Unfortunately I am unable to figure out the syntax for the above hilited row. Some help would really be appreciated.

Also, I note when I inspect the HTML of the page, that I am using ASP controls without them being surrounded by a <FORM> ... </FORM> tag pair. Is this the reason why I only get a value of 1 returned when I interrogate me.Controls.Count. Do I need these tags to do what I want to do, (or is it just good practice anyway).

Thanks in advance,


Steve Lewy
Solutions Developer
SimplyData
simplydata.com.au
(dont cut corners or you'll go round in circles)

 

[TipGiver]

Allthough you should post in ASP.Net forum, here it is:

dim i as integer
dim cn as string
for i=1 to 4
cn="ETAC" & i.tostring
ctype(me.findcontrol(cn),textbox).text=10*i
next


Hope This Helps

 

[Steve101]

TipGiver,

Have tried this. It returns the exception:

"NullReferenceException was unhandled by user code"
"Object Reference not set to an instance of an object"

This is the code snippet I was testing on:

' ETAC1.Text = "123" '<--- This works fine

cn = "ETAC1"
CType(Me.FindControl(cn), TextBox).text = "XXXXX" <----- This doesnt

Any idea of how to resolve this?
Cheers,


Steve Lewy
Solutions Developer
SimplyData
simplydata.com.au
(dont cut corners or you'll go round in circles)