private void ItemListByCompany(StockInViewModel stockInViewModel)
{
itemDropDownList.DataSource = stockInManager.GetAllItemByCompany(stockInViewModel);
itemDropDownList.DataTextField = "ItemName";
itemDropDownList.DataValueField = "ItemSl";
itemDropDownList.DataBind();
itemDropDownList.Items.Insert(0, new ListItem("Select a Item"));
}