How to disable all buttons in a window form?

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Andrew - 22 Mar 2007 15:11 GMT

Hello friends,

I tried to use the following code to disable all command buttons in a
windowform, but it was complained when compiling, saying The given expression
is never of the provided ("System.Windows.Forms.Button") type, unreachable
code.

foreach (Control ctrl in this.Controls)
{
if (ctrl.GetType() is Button)
{
((System.Windows.Forms.Button)ctrl).Enabled = false;
}
}

So, my questions are:

(1) Why such message?
(2) If this is not right, then how to do the job (disable all buttons)
correctly?

Thanks a lot.

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VJ - 22 Mar 2007 15:28 GMT

Its not this code, "unreachable code detected...", occurs when you have a
executing statment beyond a return statment within a method... I am sure
this is not the only code you have in the Form, and how is the below called
for disable? C# in VisualStudio if you complie, you will get a line number
beoynd where its not reachable. Look for it.

VJ

> Hello friends,
>
[quoted text clipped - 19 lines]
>
> Thanks a lot.

Reply to this Message

Andrew - 22 Mar 2007 16:06 GMT

line number indicates this statement:

((System.Windows.Forms.Button)ctrl).Enabled = false;

> Its not this code, "unreachable code detected...", occurs when you have a
> executing statment beyond a return statment within a method... I am sure
[quoted text clipped - 27 lines]
> >
> > Thanks a lot.

Reply to this Message

VJ - 22 Mar 2007 16:18 GMT

alright sorry about this..

crtl.Getype() <-- will return object and using "is" will never evaluate to
button.. change as below

if (ctrl is Button)

HTH
VJ

> line number indicates this statement:
>
[quoted text clipped - 35 lines]
>> >
>> > Thanks a lot.

Reply to this Message

How to disable all buttons in a window form?

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