protected void companyDropDownList_SelectedIndexChanged(object sender, EventArgs e) { int companyId = Convert.ToInt32(companyDropDownList.SelectedValue); itemDropDownList.DataTextField = "ItemName"; itemDropDownList.DataValueField = "ItemID"; itemDropDownList.DataSource = stockInManager.GetAllItems(companyId); itemDropDownList.DataBind(); itemDropDownList.Items.Insert(0, new ListItem("<Select Subject>", "0")); }