Round to Nearest 100,1000,10 Pow N

Here is a method which can round a value to nearest 100,1000, or any 10 Pow N.

This method follows the rounding rules –

private static int RoundToNDigits(double value,int digits) 
        { 
            int valueAfterDecimal = Convert.ToInt32(value % Math.Pow(10, digits)); 
            int valueBeforeDecimal = Convert.ToInt32(value) / Convert.ToInt32(Math.Pow(10, digits)); 
            if (valueAfterDecimal < 50) 
            { 
                return valueBeforeDecimal * Convert.ToInt32(Math.Pow(10, digits)); 
            } 
            else if (valueAfterDecimal > 50) 
            { 

                return Convert.ToInt32((valueBeforeDecimal + 1) * Math.Pow(10, digits)); 
            } 
            else 
            { 
                if (valueBeforeDecimal % 2 == 0) 
                    return (valueBeforeDecimal + 1) * Convert.ToInt32(Math.Pow(10, digits)); 
                else 
                    return valueBeforeDecimal * Convert.ToInt32(Math.Pow(10, digits)); 
            } 
        }

 

 

Hope this helps

Cheers