variable problem

[Bill Humphrey]

I've just migrated a project from VS 2003 to 2005 and this code is giving me an error:

  Try
                Dim oLog As Object

            If [COLOR="SeaGreen"]oLog [/COLOR]Is Nothing Then
                oLog = New EventLog("CC", System.Environment.MachineName, "CC Application  Log")
            End If

the error is: variable Olog has been used before it has been assigned a value, a null reference exception could result at runtime.

Regards BH

 

[JohnH]

If you can't assign the variable an instance right away you can set it to Nothing explicitly to remove that warning, telling the compiler that you know what you're doing...

 

[Bill Humphrey]

I tried setting it to:

Dim oLog As Object

oLog = ""

If oLog Is Nothing Then


This did not work

 

[ajeeshco]

Hi,

I tried setting oLog = "" in visual studio 2008 and it is not giving any warning. As JohnH said, set it to Nothing instead of "" which is an empty string

 oLog = Nothing

 

[JohnH]

Dim oLog As Object

oLog = ""

This is not "right away", this is declaring the variable, and some other time assigning it. Assign the variable a value in the same line you declare it.

Dim oLog As Object = Nothing