How to empty all textbox in a page

[=?Utf-8?B?SFJzb2Z0IEluZm9ybcOhdGljYQ==?=]

I Have a page (clientes.aspx) , inside a masterpage
I have some textbox, and when the user clicks the button 'Cancel', I need to
empty all controls. I tried this, with runtine error:

For Each txtControl As TextBox In Me.Controls
txtControl.Text = ""
Next

error message in runtime:
can't convert as object of type 'ASP.masterpage _master' in type
'System.Web.UI. WebControls.Tex tBox'.
--
Thanks in advance
Hércules
HRsoft Informática - Rio de Janeiro - Brasil

http://www.hrsoft.com.br

[Mark Rae [MVP]]

Re: How to empty all textbox in a page

"HRsoft Informática" <HRsoftInformti ca@discussions. microsoft.comwr ote in
message news:70E2116D-10E8-4A5B-AE4A-23D3FE99893B@mi crosoft.com...

I Have a page (clientes.aspx) , inside a masterpage
I have some textbox, and when the user clicks the button 'Cancel', I need
to
empty all controls. I tried this, with runtine error:
>
For Each txtControl As TextBox In Me.Controls
txtControl.Text = ""
Next
>
error message in runtime:
can't convert as object of type 'ASP.masterpage _master' in type
'System.Web.UI. WebControls.Tex tBox'.

Yes, that's correct. Think about it...

Your code says iterate through *every* control in the page's control
collection, cast it to a TextBox (even if it isn't), and then clear its Text
property... As soon as the For loop reaches a control which *isn't* a
TextBox, the exception will be thrown.

So...

For Each objControl As Control In Me.Controls
If GetType(objCont rol) = "TextBox" Then
DirectCast(objC ontrol, TextBox).Text = ""
End If
Next

Apologies if the above isn't syntactically correct - I never go anywhere
near VB.NET...


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[Patrice]

Re: How to empty all textbox in a page

Plus you may have to recurse if you are on a container that holds
textboxes...

--
Patrice

"Mark Rae [MVP]" <mark@markNOSPA Mrae.neta écrit dans le message de groupe
de discussion : uKhMjZO6IHA.206 4@TK2MSFTNGP02. phx.gbl...

"HRsoft Informática" <HRsoftInformti ca@discussions. microsoft.comwr ote in
message news:70E2116D-10E8-4A5B-AE4A-23D3FE99893B@mi crosoft.com...
>

>I Have a page (clientes.aspx) , inside a masterpage
>I have some textbox, and when the user clicks the button 'Cancel', I need
>to
>empty all controls. I tried this, with runtine error:
>>
> For Each txtControl As TextBox In Me.Controls
> txtControl.Text = ""
> Next
>>
>error message in runtime:
>can't convert as object of type 'ASP.masterpage _master' in type
>'System.Web.UI .WebControls.Te xtBox'.

>
Yes, that's correct. Think about it...
>
Your code says iterate through *every* control in the page's control
collection, cast it to a TextBox (even if it isn't), and then clear its
Text property... As soon as the For loop reaches a control which *isn't* a
TextBox, the exception will be thrown.
>
So...
>
For Each objControl As Control In Me.Controls
If GetType(objCont rol) = "TextBox" Then
DirectCast(objC ontrol, TextBox).Text = ""
End If
Next
>
Apologies if the above isn't syntactically correct - I never go anywhere
near VB.NET...
>
>
--
Mark Rae
ASP.NET MVP
http://www.markrae.net

[Mark Rae [MVP]]

Re: How to empty all textbox in a page

"Patrice" <http://www.chez.com/scribe/wrote in message
news:3DFC6649-CCBA-4E5B-937C-509C2CCF2537@mi crosoft.com...

[top-posting corrected]

>For Each objControl As Control In Me.Controls
> If GetType(objCont rol) = "TextBox" Then
> DirectCast(objC ontrol, TextBox).Text = ""
> End If
>Next
>>
>Apologies if the above isn't syntactically correct - I never go anywhere
>near VB.NET...

>
Plus you may have to recurse if you are on a container that holds
textboxes...

Yes, that's true - I should have mentioned that...


--
Mark Rae
ASP.NET MVP

http://www.markrae.net

[=?Utf-8?B?YnJ1Y2UgYmFya2Vy?=]

RE: How to empty all textbox in a page

pretty simple:


// find all textbox controls on page
Control[] list = ControlWalker(t his, ctl =ctl is TextBox);

// clear text
foreach (Control ctl in list)
{
((TextBox) ctl).Text = "";
}

......


public delegate bool ControlWalkerMa tcher (Control ctl);
public Control[] ControlWalker(C ontrol ctl, ControlWalkerMa tcher matcher)
{
ArrayList list = new ArrayList();
if (matcher(ctl)) list.Add(ctl);
for (int i=0; i < ctl.Controls.Co unt; ++i)
{
Control[] childList = ControlWalker(c tl.Controls[i],matcher);
if (childList.Leng th 0) list.AddRange(c hildList);
}
return (Control[]) list.ToArray(ty peof(Control));
}





-- bruce (sqlwork.com)


"HRsoft Informática" wrote:

I Have a page (clientes.aspx) , inside a masterpage
I have some textbox, and when the user clicks the button 'Cancel', I need to
empty all controls. I tried this, with runtine error:
>
For Each txtControl As TextBox In Me.Controls
txtControl.Text = ""
Next
>
error message in runtime:
can't convert as object of type 'ASP.masterpage _master' in type
'System.Web.UI. WebControls.Tex tBox'.
--
Thanks in advance
Hércules
HRsoft Informática - Rio de Janeiro - Brasil

http://www.hrsoft.com.br

>

[=?Utf-8?B?SFJzb2Z0IEluZm9ybcOhdGljYQ==?=]

Re: How to empty all textbox in a page

Dear friend

Unfortunatelly, this syntax not compile:
Error 78 Type 'objcontrol' is not
defined. C:\inetpub\wwwr oot\AjaxControl ToolkitWebSite1 \clientes.aspx. vb 317 28 C:\...\AjaxCont rolToolkitWebSi te1\

--
Hércules
HRsoft Informática - Rio de Janeiro - Brasil

http://www.hrsoft.com.br

"Mark Rae [MVP]" wrote:

"Patrice" <http://www.chez.com/scribe/wrote in message
news:3DFC6649-CCBA-4E5B-937C-509C2CCF2537@mi crosoft.com...
>
[top-posting corrected]
>

For Each objControl As Control In Me.Controls
If GetType(objCont rol) = "TextBox" Then
DirectCast(objC ontrol, TextBox).Text = ""
End If
Next
>
Apologies if the above isn't syntactically correct - I never go anywhere
near VB.NET...

Plus you may have to recurse if you are on a container that holds
textboxes...

>
Yes, that's true - I should have mentioned that...
>
>
--
Mark Rae
ASP.NET MVP

http://www.markrae.net

>
>

[Mark Rae [MVP]]

Re: How to empty all textbox in a page

"HRsoft Informática" <HRsoftInformti ca@discussions. microsoft.comwr ote in
message news:64CF96BB-FC52-4356-B8D4-A30258E0C7CD@mi crosoft.com...

[top-posting corrected again]

>For Each objControl As Control In Me.Controls
> If GetType(objCont rol) = "TextBox" Then
> DirectCast(objC ontrol, TextBox).Text = ""
> End If
>Next
>>
>Apologies if the above isn't syntactically correct - I never go
>anywhere
>near VB.NET...
>
Plus you may have to recurse if you are on a container that holds
textboxes...

>>
>Yes, that's true - I should have mentioned that...

>
Unfortunatelly, this syntax not compile:
Error 78 Type 'objcontrol' is not
defined. C:\inetpub\wwwr oot\AjaxControl ToolkitWebSite1 \clientes.aspx. vb
317 28 C:\...\AjaxCont rolToolkitWebSi te1\

Apologies, try this instead:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArg s)
Handles Me.Load
For Each objControl As Control In Me.Controls
If TypeOf (objControl) Is TextBox Then
DirectCast(objC ontrol, TextBox).Text = ""
End If
Next
End Sub


--
Mark Rae
ASP.NET MVP

http://www.markrae.net