XmlSerializer to serialize a class, i want child tag names as given in a public property

I am using XmlSerializer to serialize a class, which has a list of objects
as part of it.Now what is happening is, the child tag names are taking the name from the class name but what i want is it'd take the name from a public field inside child class.Please help, which xml attribute should i use to make it work.

I have this code:

SessionAnalyser sa = new SessionAnalyser();
 Circle c = new Circle();
 c.Name = "AP";// I want this property as the TAG Name
 

XML O/P i am getting:

<SessionAnalyser>
 <Circle>
 <Name>AP</Name>
 ...
 </Circle>
 </SessionAnalyser> 
 

Required XML O/P:

<SessionAnalyser>
 <AP>
 ...
 </AP>
 </SessionAnalyser> 
 

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