how can read data from splited gridview

Question

Hi friends.
I have created the gridview with splited column. my design is like below.(sorry i cannot able to attach image of gridview)
 

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RollNumber       Name          Subject1            subject2          subject3
                            In        Ex          In       Ex      In        Ex
  
lable           lable       textbox  texbox      textox textbox    textbox textbox

 

How can read the gridview data. if there is a single column name means it is easy to read the data from the gridview. but here how can read the value of the gridview.