Request.QueryString

[Guest]

Hi,

I have been using VB.Net for the past 2 years and have moved to C#

I send a value in the URL to a page.

In my called page I do below.

int intTest = int.Parse(Request.QueryString["TestID"]);

If this is blank I get an error.

So I decided to check if it was empty by doing a ..

If Request.QueryString["TestID"] = ""
{
....raise an error
}

However it does not like this check.

Why is this? This is what I would do in VB.Net

It seems very simple but I don't know.

I basically want to check if the value being passed in is empty.

Any advice much appreciated.

 

[Chris R. Timmons]

Hi,

I have been using VB.Net for the past 2 years and have moved to C#

I send a value in the URL to a page.

In my called page I do below.

int intTest = int.Parse(Request.QueryString["TestID"]);

If this is blank I get an error.

So I decided to check if it was empty by doing a ..

If Request.QueryString["TestID"] = ""
{
....raise an error
}

However it does not like this check.

Why is this? This is what I would do in VB.Net

It seems very simple but I don't know.

I basically want to check if the value being passed in is empty.

If the query string parameter does not exist, the Request.QueryString
element will be null. That means you have to check for a null value,
not an empty string. Here's how I get query string parameter values:

int intTest;

if (Request.Params["TestID"] == null)
throw ArgumentNullException(...);
else
intTest = int.Parse(Request.Params["TestID"]);