public void FillOrderId()
{
//here we fill order id from transaction details
Object OrderIdSelect = new Object();
DataTable dt = BSLAYER.SelectOrderId(OrderIdSelect);
DdlOrderId.DataSource = dt;
DdlOrderId.DataTextField = "Order_Id";
DdlOrderId.DataValueField = "Order_Id";
DdlOrderId.DataBind();
DdlOrderId.Items.Insert(0, "Select OrderId");
}