Question

My code is working nicelly but I would like to know if you can suggest something more performatic to get the values frm my dynamic controls.

public class Obj
{
    public int ID { get; set; }
    public int Quantity { get; set; }

    public List<int> getValues (List<Obj> myList)
    {
        List<Obj> listQuatity = new List<Obj>();
        foreach (Obj item in myList)
        {
            listQuatity.Add(new Obj
                        { 
                          ID = item.ID,
                          Quantity = Request.Params["codControl" + item.ID].Trim().Equals("") 
                             ? 0 
                             : Convert.ToInt32(Request.Params["codControl" + item.ID])
                        });
        }
    }
}

Answer 1

There is no much space for optimization, your loop is pretty simple and straightforward.
One thing I would improve – caching of the Request.Param value instead accessing it twice:

(This could be rewritten using LINQ so would look more elegant but it would not be faster)

public List<int> getValues(List<Obj> myList)
{
    List<Obj> listQuatity = new List<Obj>();
    foreach (Obj item in myList)
    {
        // access it once so code would be slightly faster
        // but much clear
        var requestParam = Request.Params["codControl" + item.ID].Trim();
        listQuatity.Add(new Obj
            {
                ID = item.ID,
                Quantity = requestParam.Equals(String.Empty)
                       ? 0
                       : Convert.ToInt32(requestParam)
            });
    }
}

Let’s see how LINQ query would look:

List<Obj> listQuatity =
myList.Select(i => new {
                Id = i.ID,
                Param = Request.Params["codControl" + item.ID].Trim(),
             })
      .Select(i => new Obj { 
                ID = i.Id,
                Quantity = Param.Equals(String.Empty)
                           ? 0 
                           : Convert.ToInt32(i.Param) 
            })
     .ToList();