Jun 012008

netstat is a cool tool to view all active tcpip/udp connections in our computer along with the names of applications who have opened these ports/connections.

So as a demo open up command prompt and type

netstat /a
netstat /b -> displays exes which are using a particular port/connection
netstat /? -> displays helps for this command

I would have a given a screen shot here but for security reasons.

So in MSDN there is an equivalent tool written in .net (cool). You can download it from here, works well!

Jun 012008

One of the classes in .Net that I like is the StringBuilder class. So what is it? It’s like the StringBuffer class in java.

It’s a mutable string class which does faster operation while concatenation and other string related functions because internally it doesn’t recreate String objects but maintains a big enough buffer to prevent frequent re-allocations to manage concatenations.

I remember using String for concatenation in one of my .Net projects while I started programming in .Net. I knew there should be something like StringBuffer in Java. So while I was performance testing my application I found my application to be real slow. Main reason for this performance hit was String. I was “misusing” this class and doing concatenations with it. I replaced such calls with equivalent StringBuilder calls. Improvement in performance was just mind blowing phew about 20 times faster.

This class is in the System.Text namespace.

An e.g. code snippet in VB.net

Dim CIStr As New System.Text.StringBuilder

' Heavy operations
CIStr.Append( SomeString1 )
CIStr.Append( SomeString2 )
CIStr.Append( SomeString3 )
CIStr.Append( SomeString4 )
CIStr.Append( SomeString5 )

'Use ToString to get internal string