hi how to update two tables record together using stored procedure ??or simple query?

in my project in aspx page while saving am inserting to two tables one is tblcurrencysale and tblAssets
tblcurrencysale(csID(pk,autoincrement),csPurchaseAmount,csSoldamt,csprofit,csDate)
tblAssets(aID(pk,autoincre),aCash,aDate)
and in tblAssets am adding aCash from csprofit and aDate from csDate..
this is the saving procedure..and i created sp and its working fine..
but while updating ,updating only in tblcurrencysale table.i gave sp..
 

UpdateAllPL objPL=new UpdateAllPL();  objPL.PurchaseAmount=tbPurchase.Text;  objPL.SoldAmount=tbSold.Text;  objPL.Profit=tbProfit.Text;  objPL.Date=tbDate.Text;  UpdateAllBLL objBLL=new UpdateAllBLL();  objBLL.UpdateCurrencySale(objPL);  objPL.aCash=tbProfit.Text;  objPL.aDate=tbDate.Text;  objBLL.UpdateAssets(objPL);  lblMessage.Text="Updated SuccessFully...";  

here is my sp am callin from class file..but Assets table is not updating ..
 
so can u suggest me wat have to do?
 
really it will help for me..thanks

and here is the sp which i created
create proc ups_UpdateCurrencySale @PurchaseAmount varchar(50), @SalesAmount varchar(50), @Profit varchar(50), @Date varchar(50) AS BEGIN Update tblCurrencySale set csPurchaseAmount=@PurchaseAmount,csSalesAmount=@SalesAmount,csProfit=@Profit,csDate=@Date where csPurchaseAmount=@PurchaseAmount end

sp for assets table
create procedure usp_UpdateAssets @Cash varchar(50), @Date varchar(50) AS BEGIn update tblAssets set aCash=@Cash,aDate=@Date where aCash=@Cash end