Comments by khalidSabtan (Top 9 by date)

it seems you have gave me the wright answer the line [DllImport("... should be followed by another line that uses the reqired function
then
another [DllImport("... followed by 1 or several function that uses that dll lib. i did not try it yet but it seems correct many thanks Winner

the msdn you provided did not help ,no matter what is my question just tell me how to tell the compiler that
the program need user32.dll and windows.dll ?

hi Dmitry Vitkovsky ,I was c++ programer i want to convert 1 of my c++ program 2 c# it has many included library such as
#include user32.h
#include windowsx.h
how could i include that in c# i hope this clearfy ur request

you need to study linear interpolation ,breifly find the equation of the line between ur 2 points (.25,50000) (.60,75000) knownig that slope (=m)
m=(y2-y1)/(x2-x1) then your equation -> y=m*x+b to get the 60000
60000=slope*x+b
solve for x
if however u need to fit it in smoothe curve u have to study curve fitting such as tylor Polynomial,Lagrange Polynomial..,Newtons Interpolatory divided diffrence and many more
cheer