first of all thanks for everything,
I couldn't use this code but, I managed to find another way to get around and give the right result
what i did is opening a new column and that stayed like
Column1=17(Result From Database)
column2=25000(Result From Database)(Hided)
Column3(Total)=Fields!Column1.Value*Fields!column2.Value
Column4(Total)=Sum(Fields!Column1.Value)*(Fields!column2.Value)
and i Hide the Column2