window check exist

I have a prog i use to send keys to a specific window name..
but if i enter a invalid name e.g (Untitled - Noetpad) it will fall over with argument exception( of course.. )
is there somthing that i can use to check the window exists before 

appactive(winname)


pseudo
if winname does_not_exist then
msgbox("blah does not exist")
else
appactive(winname)
SendKeys.Send(keystxt.Text)
end if


thanks

im on >> VB .net 2005

On Error Resume Next

lol @ writing a bot. Just use an existing software package, like AC Tool.

Dim Cat As Long

>>3
ty
been doing vb for ages and didnt know that

also thanks trolls

>>6
That's because it's stupid not to handle errors.

You're using VB? You're supposed to post PROGRAMMING topics here.

script kiddie

>>5
Basic is a toy language.

Proof: I wrote my first program in it at 5.

wow copypasta more fag.  jesus /prog/ has turned into such a fulking broken record.

>>10
I wrote my first program in C at 5. Therefore C is a toy language.

>>10,12
I created both BASIC and C at the age of 3.

I came up with the metacircular operator all by myself at the age of 1.

Actually, I invented all of the above.

But we are still waiting on the language M. I'm wondering if anyone actually put some thought into this. Pity.