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double a = 120.01;
int b = Convert.ToInt32(Math.Truncate(a + 9.9999999));
double a = Convert.ToDouble(textBox1.Text);
double b = Math.Ceiling(a);
//b = (b % 10 == 0) ? b : ((int)b / 10) * 10 + 10;
b = (b % 10 == 0) ? b : Math.Ceiling(b / 10) * 10;
MessageBox.Show(b.ToString());
double a = 120.01;
int b = Convert.ToInt32(Math.Truncate(a + 9.99));