help with rounding

[NH1]

I need to know how to round to the nearest quarter and tenth.

Right now i am taking to times finding the difference and then trying to round to the nearest quarter or tenth. Which ever i choose.

I have this for code.

I made a class to call, In my class i have this.

namespace WindowsFormsApplication3
{
    class Time
    {
        public Time(string a)
        {
        }
        


        public string Times(string textBox1, string textBox2)
        {

            DateTime Time1 = DateTime.Parse(textBox1);
            DateTime Time2 = DateTime.Parse(textBox2);
            TimeSpan result = Time2 - Time1;
            int Hours = result.Hours;
            decimal Min = result.Minutes;

            decimal decTime = Hours + (((Min * 100) / 60) / 100);
            decTime = Math.Round(decTime, 2);
            return decTime.ToString();

        } 
     }
}

This is what is in the form itself.

private void radioButton3_CheckedChanged(object sender, EventArgs e)
        {
            if ((textBox6.Text != "") || (textBox7.Text != ""))
            {
                textBox19.Text = new Time("").Times(textBox6.Text, textBox7.Text);
                decimal dec = Convert.ToDecimal(textBox19.Text);

                dec = Math.Floor(dec);
                dec = Math.Round(dec, 2);
                dec = System.Decimal.Add(dec, 0.25m);
                textBox19.Text = dec.ToString();


                if (textBox10.Text != "")
                {
                    decimal Min = Convert.ToDecimal(textBox10.Text);
                    dec = dec - convertToDec(Min);
                    textBox19.Text = dec.ToString();
                }
            }
            else
            {
                MessageBox.Show("Must be a start/stop time");
            }
                
        }

[Momerath]

/// <summary>
/// Rounds a number to the closest multiple of another number.
/// </summary>
/// <example>83 rounded to closest 25 would give a value of 75 (83 is closer to 75 than 100)</example>
/// <param name="num">The number to be rounded</param>
/// <param name="closest">The value you wish to round to the closest multiple of</param>
/// <returns>The rounded value</returns>
public int Round(int num, int closest) {
    return (int)Math.Round(((double)num)/closest, 0) * closest;
}

[NH1]

/// <summary>
/// Rounds a number to the closest multiple of another number.
/// </summary>
/// <example>83 rounded to closest 25 would give a value of 75 (83 is closer to 75 than 100)</example>
/// <param name="num">The number to be rounded</param>
/// <param name="closest">The value you wish to round to the closest multiple of</param>
/// <returns>The rounded value</returns>
public int Round(int num, int closest) {
    return (int)Math.Round(((double)num)/closest, 0) * closest;
}

what if the number im trying to round is a decimal.?

[Ryshad]

Be careful when using Math.Round, if you aren't familiar with how it works you may find some odd results. By default it uses MidPointRounding.ToEven which means that 4.5 would round to 4 not 5 as you might expect. Use the overloaded method to specify the MidPointRounding.AwayFromZero for the traditional rounding.

[Momerath]

what if the number im trying to round is a decimal.?

Not sure what you are asking. Math.Round accepts decimals if you want to round to a specific number of digits. If you are asking how do I round a decimal to the closest fraction of number, think powers of ten and use some basic math skills.

[NH1]

Not sure what you are asking. Math.Round accepts decimals if you want to round to a specific number of digits. If you are asking how do I round a decimal to the closest fraction of number, think powers of ten and use some basic math skills.

your right. there was an error in my code. I had a piece of code that rounded to a whole number before trying to round to the nearest quarter or tenth like i wanted.

but thanks for the help none the less.