How to pass Current Logged User value into SharePoint Created By Column while insertion into SharePoint List.

SPSecurity.RunWithElevatedPrivileges(delegate()

            {

            SPWeb currentWeb = SPContext.Current.Web;   

            SPList lst = currentWeb.Lists["Sample"];

                SPListItemCollection myColl = lst.Items;

                SPListItem item = myColl.Add();

                item["Title"] = txtTitle.Text;   

                SPFieldUserValue value = new SPFieldUserValue(currentWeb, currentWeb.CurrentUser.ID, currentWeb.CurrentUser.LoginName);

                item["Author"] = value.LookupId;

                item.Update();

            });