//FIND ITEM
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
currentItem = cc.FindItem(Convert.ToInt32(numericUpDown1.Value));
if (currentItem != null)
{
richTextBox_Desc.Text = currentItem.GetDesc();
textBox_SalesPrice.Text = currentItem.GetSalesPrice().ToString();
textBox_shopsPrice.Text = currentItem.GetShopsPrice().ToString();
}
else
{
richTextBox_Desc.Text = "";
textBox_SalesPrice.Text = "";
textBox_shopsPrice.Text = "";
}
}