Microsoft Application Blocks for .NET - Data Access

[Dan]

Hi

Is Microsoft's Sqlhelper.cs (Microsoft Application Blocks for .NET -
Data Access) Thread safe?

The documentation has no references to threads.

Thanks

Dan

[Nicholas Paldino [.NET/C# MVP]]

Dan,

I would say probably not. For most of the classes in the framework (and
those classes outside of it, but still written by microsoft, like the Data
Block), the instances are not guaranteed to be thread safe (but the static
methods usually are).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dan" <da*********@hotmail.com> wrote in message
news:cc**************************@posting.google.c om...

Hi

Is Microsoft's Sqlhelper.cs (Microsoft Application Blocks for .NET -
Data Access) Thread safe?

The documentation has no references to threads.

Thanks

Dan

[Mark]

What exactly does it mean for a class to be thread safe? My guess would be
something along the lines of whether you can create two instances of the
same class in two different threads. But why exactly would this ever be a
problem??

Thanks!

mark

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:OI**************@tk2msftngp13.phx.gbl...

Dan,

I would say probably not. For most of the classes in the framework (and those classes outside of it, but still written by microsoft, like the Data
Block), the instances are not guaranteed to be thread safe (but the static
methods usually are).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dan" <da*********@hotmail.com> wrote in message
news:cc**************************@posting.google.c om...

Hi

Is Microsoft's Sqlhelper.cs (Microsoft Application Blocks for .NET -
Data Access) Thread safe?

The documentation has no references to threads.

Thanks

Dan

[Miha Markic]

Hi Mark,

Thread safe means that you can invoke any method or read/write any
field/property from whatever thread and don't be concerned about integrity
of data (IOW it don't make kaboooom when two threads access the same data
).

--
Miha Markic - RightHand .NET consulting & software development
miha at rthand com

"Mark" <mf****@idonotlikespam.cce.umn.edu> wrote in message
news:eo**************@TK2MSFTNGP11.phx.gbl...

What exactly does it mean for a class to be thread safe? My guess would be something along the lines of whether you can create two instances of the
same class in two different threads. But why exactly would this ever be a
problem??

Thanks!

mark

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in message news:OI**************@tk2msftngp13.phx.gbl...

Dan,

I would say probably not. For most of the classes in the framework

(and

those classes outside of it, but still written by microsoft, like the Data Block), the instances are not guaranteed to be thread safe (but the static methods usually are).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dan" <da*********@hotmail.com> wrote in message
news:cc**************************@posting.google.c om...

Hi

Is Microsoft's Sqlhelper.cs (Microsoft Application Blocks for .NET -
Data Access) Thread safe?

The documentation has no references to threads.

Thanks

Dan

[Mark]

Got it. Could you briefly describe a senario when that might occur? Thanks
again.

Mark
"Miha Markic" <miha at rthand com> wrote in message
news:OS**************@TK2MSFTNGP09.phx.gbl...

Hi Mark,

Thread safe means that you can invoke any method or read/write any
field/property from whatever thread and don't be concerned about integrity
of data (IOW it don't make kaboooom when two threads access the same data
).

--
Miha Markic - RightHand .NET consulting & software development
miha at rthand com

"Mark" <mf****@idonotlikespam.cce.umn.edu> wrote in message
news:eo**************@TK2MSFTNGP11.phx.gbl...

What exactly does it mean for a class to be thread safe? My guess would

be

something along the lines of whether you can create two instances of the
same class in two different threads. But why exactly would this ever be a

problem??

Thanks!

mark

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote

in

message news:OI**************@tk2msftngp13.phx.gbl...

Dan,

I would say probably not. For most of the classes in the

framework (and

those classes outside of it, but still written by microsoft, like the

Data Block), the instances are not guaranteed to be thread safe (but the static methods usually are).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Dan" <da*********@hotmail.com> wrote in message
news:cc**************************@posting.google.c om...
> Hi
>
> Is Microsoft's Sqlhelper.cs (Microsoft Application Blocks for .NET -
> Data Access) Thread safe?
>
> The documentation has no references to threads.
>
> Thanks
>
> Dan

[Miha Markic]

Hi Mark,

Imagine that a not thread-safe class having a string public property.
Imagine one thread that tries to set new value (setting string is done in
several procesor operations - thus is not atomic).
Imagine thread context switching to another thread (while string setting is
not ended - left at the middle) that starts reading the same property.
Boooom.

--
Miha Markic - RightHand .NET consulting & software development
miha at rthand com

"Mark" <mf****@idonotlikespam.cce.umn.edu> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...

Got it. Could you briefly describe a senario when that might occur? Thanks again.

[Willy Denoyette [MVP]]

This only applies if both threads have a reference to the same object, or
the property is static.

Willy.

"Miha Markic" <miha at rthand com> wrote in message
news:Oo**************@TK2MSFTNGP11.phx.gbl...

Hi Mark,

Imagine that a not thread-safe class having a string public property.
Imagine one thread that tries to set new value (setting string is done in
several procesor operations - thus is not atomic).
Imagine thread context switching to another thread (while string setting is not ended - left at the middle) that starts reading the same property.
Boooom.

--
Miha Markic - RightHand .NET consulting & software development
miha at rthand com

"Mark" <mf****@idonotlikespam.cce.umn.edu> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...

Got it. Could you briefly describe a senario when that might occur?

Thanks

again.