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[System.Diagnostics.DebuggerStepThroughtAttributes()]

public EchoServer(){

          ...

}

[WebMethod]

public string Echo(string ms){

  

}

[STAThread]

static void main(){

}

What are those [] block?

I know its called attribute.. But, I havent find any article about it..

I need to know syntax, architecture of it..

I havent seen those from VB, Java...or other language..

Please reply with explanation or any source links..

Thank you all