Sum of a Column

How to get a Sum of a Column using C#, with Silverlight?

This is my Table
Name :         Balance
Rex               500.00
Alex              250.75
Roger            300.78

I want to get the Sum of the Balance. How?
I have a code here but I think there's something lacking.

        private void cmdUpdate_Click(object sender, RoutedEventArgs e)
        {
                objctx = new InOutOrganizationContext();
                var salary = objctx.MyBalances.Select(i => i.Balance);
                var sum = salary.Sum();
                MessageBox.Show(sum.ToString());
        }

Any help? please!
Whing Dela CruzAsked:
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BuggyCoderCommented:
use the code below:-
objCtx.MyBalances.Sum(b=>b.Balance);

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Whing Dela CruzAuthor Commented:
Hi BuggyCoder,

I tried to used this code but the resul is (0) zero.
                var sum = objctx.MyBalances.Sum(b => b.Balance);
                MessageBox.Show(sum.ToString());
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BuggyCoderCommented:
Are you sure that your Balance Entity has values in the Balance Column or property, i have simulated your problem and my list of Balance Entity does return value when i apply sum on it:-

class MyBalance
    {
        public int Id { get; set; }
        public int Balance { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {

            var lstBalance = new List<MyBalance>
                                 {
                                     new MyBalance {Balance = 10, Id = 1},
                                     new MyBalance {Balance = 32, Id = 2},
                                     new MyBalance {Balance = 67, Id = 3}
                                 };

            var retVal = lstBalance.Sum(b => b.Balance); //Return 109 as sum
            

            Console.Read();

        }

        
    }

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Whing Dela CruzAuthor Commented:
I tried to check Balance Entity and it has Values, So, I tried to used the code given above and it is working... I am now trying to examine which part of my code has problem. Please advice me if you can see something... Thanks A lot BuggyCoder...
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Whing Dela CruzAuthor Commented:
Thanks!
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