Object not created error

Hello everybody. Lately I had some problems with error
Object Not
instantiated in the page when I used
Request.QueryString["var"] in the
load event, without this "var" querysting variable
to be present in
the url. I try different methods to check if object is
existed first
before accessing it. So far the only fix is to put in the
try
statement like this
try
{
If
(Request.QueryString["var"]=="myvar")
{
//do something
}
catch(Exceptioin ex)
{

}
Dose anyone now how to avoid this exception ? Your help will
be
greatly appreciated.


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Check to see if it's null first...

if(Request.QueryString["var"] != null)
{
    if(Request.QueryString["var"] ==
"myvar")
    {

    }
}

On Aug 27, 10:57 pm, "aleksandr.fis...gmail.com"
<aleksandr.fis...gmail.com> wrote:
> Hello everybody. Lately I had some problems with error
Object Not
> instantiated in the page when I used
Request.QueryString["var"] in the
> load event, without this "var" querysting
variable to be present in
> the url. I try different methods to check if object is
existed first
> before accessing it. So far the only fix is to put in
the try
> statement like this
> try
> {
> If
(Request.QueryString["var"]=="myvar")
> {
> //do something}
>
> catch(Exceptioin ex)
> {
>
> }
>
> Dose anyone now how to avoid this exception ? Your help
will be
> greatly appreciated.


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hi, guy,

Request.QueryString["var"] is an object which is
not instantiated
without "var" querystring variable to be present
in the url.

Try this test:

if (Request.QueryString["var"] != null &&
(string)Request.QueryString["var"] ==
"myvar")
{
        // do something
}

On 8月28日, 上午11时57分, "aleksandr.fis...gmail.com"
<aleksandr.fis...gmail.com> wrote:
> Hello everybody. Lately I had some problems with error
Object Not
> instantiated in the page when I used
Request.QueryString["var"] in the
> load event, without this "var" querysting
variable to be present in
> the url. I try different methods to check if object is
existed first
> before accessing it. So far the only fix is to put in
the try
> statement like this
> try
> {
> If
(Request.QueryString["var"]=="myvar")
> {
> //do something}
>
> catch(Exceptioin ex)
> {
>
> }
>
> Dose anyone now how to avoid this exception ? Your help
will be
> greatly appreciated.


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HI all , im using Visual studio 2003 is there any Articles
anywhere that 
Explain How to use package and  Deployment so i can package
my Solutions 
to Distribute to other Machines ??    thanks


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google it

On 9月19日, 下午9时39分, Brian E Boothe <subr...mtcnet.net> wrote:
> HI all , im using Visual studio 2003 is there any
Articles anywhere that
> Explain How to use package and  Deployment so i can
package my Solutions
> to Distribute to other Machines ??    thanks


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