How to subtract the two columns sum of amount using linq - linq

Question

Below my query which not working properly could any one help here?
enter code here
var collectionamount = (from u in db.bank_deposit
join pr in db.collections on u.AgentID equals pr.AgentID into g
join agentname in db.agent_master on u.AgentID equals agentname.AgentID
group u by new { u.AgentID } into x
select new collectionwithdeposit
{
AgentName = agentname.AgentName,
DepositedAmount = g.Sum(m => m.DepositedAmount),
CollectionAmount = g.Sum(z => z.AmountReceived),
Balance = g.Sum(u => u.DepositedAmount) - g.Sum(v => v.AmountReceived)
}).ToList();
lstdataModel.Add(dataModel);
}

Answer 1

The variable g does not exists in the scope of your select. This is because of the into keyword. What you are writing is in effect..
var tempEnumerable = from u in db.bank_deposit
join pr in db.collections on u.AgentID equals pr.AgentID into g
join agentname in db.agent_master on u.AgentID equals agentname.AgentID
group u by new { u.AgentID };
var collectionamount = from x in tempEnumerable
select new collectionwithdeposit
{
AgentName = agentname.AgentName,
DepositedAmount = g.Sum(m => m.DepositedAmount),
CollectionAmount = g.Sum(z => z.AmountReceived),
Balance = g.Sum(u => u.DepositedAmount) - g.Sum(v => v.AmountReceived)
}).ToList();
The into keyword in Linq is for creating a new scope.
In fact you really don't want to use into as often as you do
Try this
var collectionAmount = from u in db.bank_deposit
where db.collections.Any(pr => pr.AgentID == u.AgentID)
join agentname in db.agent_master on u.AgentID equals agentname.AgentID
group u by agentname into g
select new collectionwithdeposit
{
AgentName = g.Key.AgentName,
DepositedAmount = g.Sum(m => m.DepositedAmount),
CollectionAmount = g.Sum(z => z.AmountReceived),
Balance = g.Sum(u => u.DepositedAmount) - g.Sum(v => v.AmountReceived)
}
EDITED:
Maybe actually what you want is this...I don't know your table structures. But I am going to assume you have no idea about Linq, and your tables are sane (since my last answer assumed the opposite).
var collectionAmount = from agent in db.agent_master
let depositedAmount = db.bank_deposit
.Where(d => d.AgentID == agent.AgentID)
.Sum(d => c.DepositedAmount)
let collectionAmount = db.collections
.Where(c => c.AgentID == agent.AgentID)
.Sum(c => c.AmountReceived)
select new collectionwithdeposit
{
AgentName = agent.AgentName,
DepositedAmount = depositedAmount,
CollectionAmount = collectionAmount,
Balance = depositedAmount - collectionAmount
}