Must declare scalar value @Desc

protected void lnkInsert_Click(object sender, EventArgs e)
    {
        DeliveryOrder itemDo = new DeliveryOrder();        
        string connectionString = ConfigurationManager.ConnectionStrings["InvoiceConnectionString"].ConnectionString;
        SqlConnection conn = new SqlConnection(connectionString);
        string insertcmd = "insert into Items (Description,ItemNo,Qty,DoNumber)VALUES(@desc,@qty,@itemNo,@doNumber)";
        string itemcmd = "insert into ItemParent(DoNumber,DoDate,CusId,Notes)VALUES(@doNumber,doDate,cusId,notes)";
        SqlCommand cmd = new SqlCommand(insertcmd,conn);
        SqlCommand cmd1 = new SqlCommand (itemcmd,conn);
        conn.Open();
        cmd.Parameters.AddWithValue("@Description", itemDo.Description);
        cmd.Parameters.AddWithValue("@Qty", itemDo.Qty);
        cmd.Parameters.AddWithValue("@ItemNo", itemDo.ItemNo);
        cmd.Parameters.AddWithValue("@DoNumber",itemDo.Donumber);

        cmd1.Parameters.AddWithValue("@DoNumber", itemDo.Donumber);
        cmd1.Parameters.AddWithValue("@DoDate", itemDo.DoDate);
        cmd1.Parameters.AddWithValue("@CusId",itemDo.Cusid);
        cmd1.Parameters.AddWithValue("@Notes",itemDo.Notes);
        cmd.ExecuteNonQuery();
        cmd1.ExecuteNonQuery();
        conn.Close();
        lblMessage.Visible = true;
        BindGridView();

    }

Thanks