Friends, I have created a visual force page with cancel button. but when i click cancel button the page ask me to fill  required fields. How Can i Overcome this . My requirement is when i click cancel button it has to go list view page. 

Here My code
Apex:

Public Pagereference docancel(){      
    PageReference pageRef = new PageReference('/001/o');   
    pageRef.setRedirect(true);
    return pageRef;   
    }

Friends, I have created a visual force page with cancel button. but when i click cancel button the page ask me to fill  required fields. How Can i Overcome this . My requirement is when i click cancel button it has to go list view page. 

Here My code
Apex:

Public Pagereference docancel(){      
    PageReference pageRef = new PageReference('/001/o');   
    pageRef.setRedirect(true);
    return pageRef;   
    }