Is IsNull supported in ASP.NET?

[D. Shane Fowlkes]

For some reason, I'm being told to declare "IsNull". Surely I'm doing
something wrong. I'm basically seeing if someone clicked a link which
passes a variable in the querystring like MyPage.aspx?id=5

This is in a Page_Load rountine:

If IsNull(Request.QueryString("id")) Then
intID = CInt(Request.QueryString("id"))
lblEventDetails.Text = "You clicked event number " & intID & "."
End If


Compiler Error Message: BC30451: Name 'IsNull' is not declared.

 

[Kevin Spencer]

There is no built-in VB.Net function called "IsNull" - use IsNothing().

--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
Big things are made up
of lots of little things.

 

[Teemu Keiski]

Try:

If Not Request.QueryString("id") Is Nothing Then
...
End if

 

[Chip]

If you're checking the result of a SQL query, you can use IsDBNULL. This
only works on database fields.

Chip

 

[D. Shane Fowlkes]

Thanks guys.

There is no built-in VB.Net function called "IsNull" - use IsNothing().

--
HTH,
Kevin Spencer
.Net Developer
Microsoft MVP
Big things are made up
of lots of little things.