protected void DropdownCompanySelectedIndexChanged(object sender, EventArgs e)
{
StockInManager item = new StockInManager();
int companyid = Convert.ToInt32(DropDownCompanyList.SelectedItem.Value);
DropDownItemList.DataSource = item.GetAllitem(companyid);
DropDownItemList.DataTextField = "ItemName";
DropDownItemList.DataValueField = "ItemId";
DropDownItemList.DataBind();
DropDownItemList.Items.Insert(0, new ListItem("Select", "0"));
}