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

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();

            });