public with sharing class TodoController {
 
    public List<Todo__c> todos {get;set;}
    public Todo__c newTodo {get;set;}
 
    public TodoController() {
        todos = [SELECT Id, Description__c, Status__c FROM Todo__c WHERE Status__c = 'Pending'];
        newTodo = new Todo__c();
    }
 
    public void addTodo() {
        insert newTodo;
        todos.add(newTodo);
        newTodo = new Todo__c();  // Reset for next addition
    }
 
    public void markAsCompleted(Todo__c todo) {
        todo.Status__c = 'Completed';
        update todo;
        todos.remove(todo); 
    }
 
}

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