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 = ""; }