private void ItemListByCompany(ItemViewModel addItem)
{
itemNameDropDownList.DataSource = stockInManager.GetAllItemInfoByCompany(addItem);
itemNameDropDownList.DataTextField = "ItemName";
itemNameDropDownList.DataValueField = "ItemId";
itemNameDropDownList.DataBind();
itemNameDropDownList.Items.Insert(0, new ListItem("Select a Item"));
itemNameDropDownList.Items[0].Attributes["Disabled"] = "Disabled";
}