Cascading of Dropdownlist

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ASP.NET

Javascript

jQuery

MVC3

Hi all,

i have a drop downlist and a + and - button beside that.
the drop down list consist of the options ID,Name,Role
if I select ID or Name a textbox will apper and if I select Role an another drop downlist will appear
which consist of manager,Leader,Member

Each time if I click on + button it will again display a dropdownlist with the same options and corresponding Textbox or Dropdownlist but the option of
previous Dropdownlist will be excluded

Each time if I click on - button the corresponding dropdownlist will disappear with its textbox or drop down list

and at last the I have to search the database with the parameters ID,Name and Role


it sounds very complicated to me..I'm a freshers in ASP.net.I do not have much Idea in MVC 3,JavaScript,Jquery and Entity Framework 4.1
Can Anyone help me to do this

I need a details solution with explanatipn