C# winApp ต้องการให้จุดมันตรงกัน ใน เลขทศนิยม ครับ

using System;

namespace x009
{
  class Program
  {
    static void Main(string[] args)
    {
      double i = 1.42;
      double j = 123.56;
      Console.WriteLine(i.ToString().PadLeft(6, 'x'));
      Console.WriteLine(j.ToString().PadLeft(6, 'x'));
    }
  }
}

double a = GetRandomNumber(min, max, random.Next(1, 5));
            double b = GetRandomNumber(min, max, random.Next(1, 5));
            int c = Math.Max((a.ToString().Contains(".")) ? a.ToString().Split('.')[1].Length : 0, (b.ToString().Contains(".")) ? b.ToString().Split('.')[1].Length : 0);

            string _a = a.ToString().PadLeft(c, 'x');
            string _b = b.ToString().PadLeft(c, 'x');

 public static string SpacedString(string myOldString)
        {
            //ref
            //https://stackoverflow.com/questions/2969143/c-sharp-drawstring-letter-spacing

            System.Text.StringBuilder newStringBuilder = new System.Text.StringBuilder("");
            foreach (char c in myOldString.ToCharArray())
            {
                newStringBuilder.Append(c.ToString() + "  ");
            }

            string MyNewString = "";
            if (newStringBuilder.Length > 0)
            {
                // remember to trim off the last inserted space
                MyNewString = newStringBuilder.ToString().Substring(0, newStringBuilder.Length - 1).Trim();
                //MyNewString = newStringBuilder.ToString();
            }

            // no else needed if the StringBuilder's length is <= 0... The resultant string would just be "", which is what it was intitialized to when declared.
            return MyNewString;
        }
        public static void DrawNumPositive(this Graphics e, Font fontDetail, double min, double max, int x, int y, string opr, int CountNum = 6)
        {


            double a = GetRandomNumber(min, max, random.Next(1, 5));
            double b = GetRandomNumber(min, max, random.Next(1, 5));
            int c = Math.Max((a.ToString().Contains(".")) ? a.ToString().Split('.')[1].Length : 0, (b.ToString().Contains(".")) ? b.ToString().Split('.')[1].Length : 0);

            string _a = SpacedString(a.ToString("N" + c));
            string _b = SpacedString(b.ToString("N" + c));

            int w = Convert.ToInt32(e.MeasureString("0  ", fontDetail).Width);
            int h = Convert.ToInt32(e.MeasureString("0  ", fontDetail).Height);

            //https://docs.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-align-drawn-text?view=netframeworkdesktop-4.8
            StringFormat format = new StringFormat(StringFormatFlags.DirectionRightToLeft);

            // https://stackoverflow.com/questions/11451001/why-isnt-my-text-right-aligned-when-i-custom-draw-my-strings
            //https://docs.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-align-drawn-text?view=netframeworkdesktop-4.8&redirectedfrom=MSDN
            StringFormat stringFormat = new StringFormat() { Alignment = StringAlignment.Far };


            e.DrawString(_b, fontDetail, new SolidBrush(Color.Black), new Rectangle(x, y, w * CountNum, h), stringFormat);
            e.DrawString(_a, fontDetail, new SolidBrush(Color.Black), new Rectangle(x, y + h + 10, w * CountNum, h), stringFormat);
            e.DrawLine(new Pen(Color.Black, 3), x, y + 2 * h + 10, x + (CountNum) * w, y + 2 * h + 10);
            e.DrawString(opr, fontDetail, new SolidBrush(Color.Black), x + (CountNum) * w, y + 10 + h / 2);
            e.DrawLine(new Pen(Color.Black, 3), x, y + h * 3 + 15, x + (CountNum) * w, y + h * 3 + 15);
            e.DrawLine(new Pen(Color.Black, 3), x, y + h * 3 + 20, x + (CountNum) * w, y + h * 3 + 20);


        }