c# - Unable to fill the datagridview using Generics list -

i don't understand problem following simple code. take list , display in datagridview. error :

error 1 inconsistent accessibility: return type 'system.collections.generic.list' less accessible method 'windowsformsapplication10.form1.fillgridview()'

also, there way convert list, arraylist etc dataset type?

public partial class form1 : form     {     public form1 ()     {         initializecomponent ();     }      public list<student> fillgridview ()     {         list<student> l = new list<student> ();         l.add (new student { fname="bloke", lname="lll", contact=293489485});         l.add (new student { fname = "dog", lname = "assdf", contact = 35345 });         l.add (new student { fname = "mary", lname = "sdff", contact = 6456 });         l.add (new student { fname = "john", lname = "sdfsdf", contact = 45656 });         return l;       }       private void form1_load ( object sender, eventargs e )     {         datagridview1.datasource = this.fillgridview ();     }      private void button1_click ( object sender, eventargs e )     {      } } 

does method need public? looks student class not public, returning list of public caller inconsistent. looks, method can private.

private list<student> fillgridview()