Fetch data from database in sequence in ASP.NET and SQL-server 2008 R2

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SQL-Server-2008R2

ASP.NET4

I am new ASP.NET.Please help me.
I Have list of student in database of different classes.But I want to display it according to class. For Example.. like this.

Class 1 (as Heading)
Name Class RollNo
Ravi 1 111
mukesh 1 112

class 2(as Heading)

Name Class RollNo
Saurabh 2 111
Brij 2 112

Class 3 (as heading)

and So on......

What I have tried:

I have try but not success..I have no idea how to do it..