testing for querystring

[Carlos]

Hi all,

I would like to have a page that checks for an optional
parameter being passed.

I use the request.querystring("myvar") when the parameter is
being passed, but when the parameter is not passed I get an object reference
exception. How can I check for the existence of the variable being
passed?

Thanks,

Carlos.

[Aidy]

c#
if (Request.QueryString["myvar"] != null)
// myvar exists
else
// it doesn't

vb.bet (I think)
if Request.QueryString("myvar") is nothing then
// exists
else
// doesn't
end if

"Carlos" <ch******@yahoo.comwrote in message
news:uc**************@TK2MSFTNGP04.phx.gbl...

Hi all,

I would like to have a page that checks for an optional
parameter being passed.

I use the request.querystring("myvar") when the parameter is
being passed, but when the parameter is not passed I get an object
reference exception. How can I check for the existence of the variable
being
passed?

Thanks,

Carlos.

[Aidy]

Deliberate mistake in the vb.net section, reverse the "exists" and "doesn't"
:)

"Aidy" <ai**@noemail.xxxa.comwrote in message
news:y7******************************@bt.com...

c#
if (Request.QueryString["myvar"] != null)
// myvar exists
else
// it doesn't

vb.bet (I think)
if Request.QueryString("myvar") is nothing then
// exists
else
// doesn't
end if

"Carlos" <ch******@yahoo.comwrote in message
news:uc**************@TK2MSFTNGP04.phx.gbl...

>Hi all,

I would like to have a page that checks for an optional
parameter being passed.

I use the request.querystring("myvar") when the parameter is
being passed, but when the parameter is not passed I get an object
reference exception. How can I check for the existence of the variable
being
passed?

Thanks,

Carlos.