How to insert data in two rows (debit and credit) on save

Question

i have two dropdowns and amount in my page

1.Account

2.ContraAccount 

3.Amount

when i save this details  i want to insert in database like,

 

Amount should debit from Account(1 row),and amount should credit in another account(2nd row)  

 

Account   ContrAccoutn   Debit   Credit    

 Cash         A                       100         0

A                 Cash                 0         100

 

 my controller code

 

var Ledger = db.LedgerTables.Create();

Ledger.AccountID = strddlAccount;

Ledger.ContraAccountID = strddlCustomer;

Ledger.Debit = transactionGInfo.Amount;

db.LedgerTables.Add(Ledger);

db.SaveChanges();