DataSource Controls :: Insert Statement Violation?

i'm developing windows application one of its forms supposed to fill a table called rooms with data throughout a collection of text boxes and comboboxes controls, i'm successfuly bound each control to the binding source and make sure that each data adapter contains the required data but when i start to excute the insert statement

insert into rooms([room_id],[floor],[price],[currency_id],[rec_id],[s/d],[s/ns],[room_direction],status)
values( '"+Int64.Parse(textBox1.Text) +
"' ,'" +
Int64.Parse(textBox2.Text) +
"', '" +
Int64.Parse(textBox3.Text) +
"','" + comboBox1.SelectedIndex +
"','" + comboBox2.SelectedIndex +
"','" + comboBox3.SelectedIndex +
"','" + comboBox4.SelectedIndex +
"','" + textBox4.Text +
"','" + comboBox5.SelectedIndex +
"')

it displays an error message when i'm trying to select a value from the combobox for any parameter that is"column currenc_id is constrained to be unique value 2 is already exists"can any body help me it is very important