Clearing textboxes..

[Serdar C.]

hi there, i am writing a program with LOTS of textboxes in it.. my problem
is when i try to clean the textboxes with foreach it gives error.. heres how
my code looks like:

private void ClearText ()

{
foreach (textbox t in this.controls)
{
t.text = ""
}
}

but it doesnt work! it was working quite good on visual basic.net but this
code seems not working with c#?!

[Scott English]

Not all the controls in this.Controls are TextBox controls. When you
iterate through them, you get an InvalidCastException because a non-TextBox
control is being assigned to t, a TextBox variable.

foreach (Control c in this.Controls)
{
if (c is TextBox)
{
TextBox t = (TextBox) c;
t.Text = "";
}
}

"Serdar C." <se*****@interaktif.gen.tr> wrote in message
news:OQ**************@TK2MSFTNGP11.phx.gbl...

hi there, i am writing a program with LOTS of textboxes in it.. my problem
is when i try to clean the textboxes with foreach it gives error.. heres how my code looks like:

private void ClearText ()

{
foreach (textbox t in this.controls)
{
t.text = ""
}
}

but it doesnt work! it was working quite good on visual basic.net but this
code seems not working with c#?!

[Julie]

Scott English wrote:

Not all the controls in this.Controls are TextBox controls. When you
iterate through them, you get an InvalidCastException because a non-TextBox
control is being assigned to t, a TextBox variable.

foreach (Control c in this.Controls)
{
if (c is TextBox)
{
TextBox t = (TextBox) c;
t.Text = "";
}
}

Couldn't you do:

foreach (TextBox t in this.Controls)

?

[Scott English]

No. The foreach command will iterate through ALL the objects in the
Controls collection and attempt to cast them to a TextBox. If any of them
aren't a TextBox, then an InvalidCastException will occur. Declaring the
type of variable as TextBox doesn't filter the contents of Controls
(although that would be really nice).

"Julie" <ju***@nospam.com> wrote in message
news:40***************@nospam.com...

Scott English wrote:

Not all the controls in this.Controls are TextBox controls. When you
iterate through them, you get an InvalidCastException because a non-TextBox control is being assigned to t, a TextBox variable.

foreach (Control c in this.Controls)
{
if (c is TextBox)
{
TextBox t = (TextBox) c;
t.Text = "";
}
}

Couldn't you do:

foreach (TextBox t in this.Controls)

?

[Scott Allen]

In addition to the problem Scott E pointed out, if you have your
textboxes inside of other controls you may need a little more code to
get to all of the textbox controls (see
http://www.odetocode.com/Code/71.aspx).

--
Scott
On Fri, 2 Apr 2004 20:44:34 +0300, "Serdar C."
<se*****@interaktif.gen.tr> wrote:

hi there, i am writing a program with LOTS of textboxes in it.. my problem
is when i try to clean the textboxes with foreach it gives error.. heres how
my code looks like:

private void ClearText ()

{
foreach (textbox t in this.controls)
{
t.text = ""
}
}

but it doesnt work! it was working quite good on visual basic.net but this
code seems not working with c#?!