On a button click fire FormView's Update command

Question

Hello,

 

     I am using Entity Framework  in my ASP.NET 4.5 Web Forms app .

 

     I have a Gridview  whose data is shown in FormView onSelectedIndexChanged event. Programatically, I change the mode of Formview from ReadOnly - Edit - Insert. 

    I have a button outside FormView of "Save". When user click's that button, I want to execute Formview's Update/Insert command i.e. the data that is updated in FormView to be saved in db. 

 

    How can this be done ?