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

 

[Aidy]

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

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

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.