Write a program in Visual Basic that will take a number, x, from the user (|x|<1) and show the value of 1/(1-x) using binomial theorem.

According to binomial theorem, 1/(1-x) = 1+ x + x^2 + x^3 + x^4 ........

Conditions:

1. You cannot use any operator or built-in function to find the power, you have to create your own function for power.

2. Use first 20 terms of the series.