Transactions are not mining & in pending state for long time, for transactions with accounts created using Nethereum.Accounts.Account(privateKey). But mining works for accounts created using web3.Personal.NewAccount.SendRequestAsync("password").
I am using below method to initiate transaction. web3.TransactionManager.SendTransactionAsync(new TransactionInput(data.ToHexUTF8(), addressTo, senderAddress, gas, value))
I am running ethereum on my local environment with 1 node.