ComboBox DataBinding Weirdness

Question

If I have an array of Customer objects and I bind it to multiple comboBoxes, why does changing one combobox affect the others? e.g. Customers[] customerArray = GetCustomers(); comboBox1.DisplayMember = "CustomerName"; comboBox1.ValueMember = "CustomerCode"; comboBox1.DataSource = customerArray; comboBox2.DisplayMember = "CustomerName"; comboBox2.ValueMember = "CustomerCode"; comboBox2.DataSource = customerArray; I have found that cloneing the array, removes this issue, but it is not a perfect solution, especially if the array is large. e.g. comboBox2.DataSource = customerArray.Clone()