Calculation Issue

Question

HI, 

 

I want to calculate value like below but some decimal value is not rounding like for example if

decimal value more than 0.50 than should be 1. please below my code and tell me solution. thanks.

 

if (Perc >= 95 && Perc <= 99)

{

bounus_txt.ForeColor = Color.Green;

bounus_txt.Text = (TotalSale / 100 * 0.50).ToString("0");

}