Convert double to string

Question

i have three double variable a ,b and c

a = 0.000006 
b = 6 
c = a/b;

so C should be 0.000001

i want to show this value in text bo

Answer 1

a = 0.000006;
b = 6;
c = a/b;

textbox.Text = c.ToString("0.000000");

As you requested:

textbox.Text = c.ToString("0.######");

This will only display out to the 6th decimal place if there are 6 decimals to display.