private void populateComboBoxes(Backend backend)
{
Dictionary <string, string> shopItems = backend.getShopItems();
comboBox1.DataSource = new BindingSource(shopItems, null);
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";
comboBox2.DataSource = new BindingSource(shopItems, null);
comboBox2.DisplayMember = "Value";
comboBox2.ValueMember = "Key";
comboBox3.DataSource = new BindingSource(shopItems, null);
comboBox3.DisplayMember = "Value";
comboBox3.ValueMember = "Key";
comboBox4.DataSource = new BindingSource(shopItems, null);
comboBox4.DisplayMember = "Value";
comboBox4.ValueMember = "Key";
comboBox5.DataSource = new BindingSource(shopItems, null);
comboBox5.DisplayMember = "Value";
comboBox5.ValueMember = "Key";
comboBox6.DataSource = new BindingSource(shopItems, null);
comboBox6.DisplayMember = "Value";
comboBox6.ValueMember = "Key";
comboBox7.DataSource = new BindingSource(shopItems, null);
comboBox7.DisplayMember = "Value";
comboBox7.ValueMember = "Key";
comboBox8.DataSource = new BindingSource(shopItems, null);
comboBox8.DisplayMember = "Value";
comboBox8.ValueMember = "Key";
comboBox9.DataSource = new BindingSource(shopItems, null);
comboBox9.DisplayMember = "Value";
comboBox9.ValueMember = "Key";
comboBox10.DataSource = new BindingSource(shopItems, null);
comboBox10.DisplayMember = "Value";
comboBox10.ValueMember = "Key";
comboBox11.DataSource = new BindingSource(shopItems, null);
comboBox11.DisplayMember = "Value";
comboBox11.ValueMember = "Key";
comboBox12.DataSource = new BindingSource(shopItems, null);
comboBox12.DisplayMember = "Value";
comboBox12.ValueMember = "Key";
comboBox13.DataSource = new BindingSource(shopItems, null);
comboBox13.DisplayMember = "Value";
comboBox13.ValueMember = "Key";
comboBox14.DataSource = new BindingSource(shopItems, null);
comboBox14.DisplayMember = "Value";
comboBox14.ValueMember = "Key";
comboBox15.DataSource = new BindingSource(shopItems, null);
comboBox15.DisplayMember = "Value";
comboBox15.ValueMember = "Key";
comboBox16.DataSource = new BindingSource(shopItems, null);
comboBox16.DisplayMember = "Value";
comboBox16.ValueMember = "Key";
}