How can i get the sum of a database table to a variable?

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I have a database table named Deposit and one of the column name in it is 30-12-2013. The column has two values such as 54,26.

i want to get the sum of that column column into a variable. I use the following code:

con.Open();
SqlCeCommand cmd11 = con.CreateCommand();
cmd11.CommandText = "select sum(30-12-2013) from Deposit";
int result = ((int)cmd11.ExecuteScalar());
displaylabel.Text = result.ToString();
con.Close();

But, I am getting the value of variable 'result' as -3990.

Whats wrong with my code.. Please help me.. Thanks in advance..

3 Answers
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