when press button save and update difference table sql with C#...
jest i develop stoke management i want a current stroke level. when i enter GRN (Good received Note)  data and after submit save button on time happn
01.. GRN data insert into GRN Code /Item Code..
02 .. where  Item Code.. to find and update current stroke table 
ALTER PROCEDURE [dbo].[GRNInfo]
	
	@GrnId     int  ,
	@GrnCode     nchar(10) ,
	@ItemCode     nchar(10) ,
	@Qty					int ,
	@TotalPrice     decimal(18, 0) ,
	@GrnDate     date,
	@NewQty int
	
AS
BEGIN
	
if not exists (select GrnId from atoGRN where GrnId=@GrnId)
	begin
		insert into atoGRN (GrnCode,FK_ItemCode,Qty,TotalPrice,GrnDate) values (@GrnCode,@ItemCode,@Qty,@TotalPrice,@GrnDate)
	end	
else 
	begin
		update atoGRN set GrnCode=@GrnCode ,FK_ItemCode=@ItemCode ,Qty=@Qty ,TotalPrice=@TotalPrice ,GrnDate=@GrnDate where GrnId=@GrnId 
	end
	
 DECLARE @CurrentQty AS INT;
 select @CurrentQty = Quantity from atoQuantityDisc where FK_ItemCode=@ItemCode
	begin
		 SET @NewQty = @CurrentQty + @Qty
		UPDATE  atoQuantityDisc
        SET     Quantity = @NewQty
        WHERE   FK_ItemCode=@ItemCode;
	end 
	
	
END