Why cant I do this:

usuariosEntities usersDB = new usuariosEntities();      
foreach (DataGridViewRow user in dgvUsuarios.Rows)
{
   var rowtoupdate = 
       usersDB.usuarios.Where(
       u => u.codigo_usuario == Convert.ToInt32(user.Cells[0].Value)
       ).First();
   rowtoupdate.password = user.Cells[3].Value.ToString();
}
usersDB.SaveChanges();

And have to do this:

usuariosEntities usersDB = new usuariosEntities();      
foreach (DataGridViewRow user in dgvUsuarios.Rows)
{
   int usercode = Convert.ToInt32(user.Cells[0].Value);
   var rowtoupdate = 
       usersDB.usuarios.Where(u => u.codigo_usuario == usercode).First();
   rowtoupdate.password = user.Cells[3].Value.ToString();
}
usersDB.SaveChanges();

I must admint it is a more readable code but why cant this be done?