How can I check that checkbox is checked or not inside grid view

How can I check that checkbox is checked or not inside grid view without using loop--

Actually i want to work like onrowcommand

this is checkbox inside gridview-------

CommandName="chkboxselect" AutoPostBack="true" CommandArgument='<%# Eval("hnysku") %>' />

this is C# code which is working like onrowcommand but here is another problem how can i check checkbox is checked or not ---

List list = new List();

var chk = (CheckBox)sender;

var CommandName = chk.Attributes["CommandName"];

if (CommandName == "chkboxselect")

{

var CommandArgument = chk.Attributes["CommandArgument"];

if (Convert.ToBoolean(chk.Attributes["Checked"]) == true)

{

list.Add(CommandArgument);

}

else

{

list.Remove(CommandArgument);

}