public void LoadDropdowns()
{
DataTable products = stockBLL.GetAllProducts();
DataRow emptyRow = products.NewRow();
emptyRow["ProductId"] = 0;
emptyRow["ProductName"] = "";
products.Rows.Add(emptyRow);
comboBox1.DataSource = products;
comboBox1.DisplayMember = "ProductName";
comboBox1.ValueMember = "ProductID";
comboBox1.SelectedValue = 0;
DataTable make = stockBLL.GetAllMake();
DataRow emptyRow2 = make.NewRow();
emptyRow2["make"] = "";
make.Rows.Add(emptyRow2);
comboBox2.DataSource = make;
comboBox2.ValueMember = "make";
comboBox2.DisplayMember = "make";
comboBox2.SelectedValue = "";
}