Replacing decimals with a space at the end of a fixed-with string

Question

Alright, so I have a working program that makes golden ratio rectangles based on a length or width given.

This probably isn't a good practice, but I wrote a String.Slice(start, end) in the extensions class.

Here's what I need help with.

            case 1: //Length
                l1.Text = value.ToString().Slice(0, 4);
                l2.Text = value.ToString().Slice(0, 4);
                h1.Text = (value/phi).ToString().Slice(0, 4);
                h2.Text = (value/phi).ToString().Slice(0, 4);
                break;
            case 2: //Width
                l1.Text = (value * phi).ToString().Slice(0, 4);
                l2.Text = (value * phi).ToString().Slice(0, 4);
                h1.Text = value.ToString().Slice(0, 4);
                h2.Text = value.ToString().Slice(0, 4);
                break;  

Depending on the radiobutton, it finds the length or with based on what you provide. The problem is that with the strings all sliced to 1-4 characters, a number can be shown as

 "161."   

(with the period) in the textbox. Is there a way to make it so that only if it ends with a period that the period is removed? Thanks.

P.S. Here's the slice function for reference:

public static class Extensions
{
    public static string Slice(this string source, int start, int end)
    {
        if (end < 0) // Keep this for negative end support
        {
            end = source.Length + end;
        }
        int len = end - start;               // Calculate length
        try
        {
            return source.Substring(start, len); // Return Substring of length
        }
        catch (Exception)
        {
            try
            {
                return source.Substring(start, len - 1); // Return Substring of length
            }
            catch (Exception)
            {
                try
                {
                    return source.Substring(start, len - 2); // Return Substring of length
                }
                catch (Exception)
                {
                    return source.Substring(start, len - 3); // Return Substring of length
                }
            }
        }
    }
}

Answer 1

Why are you using this strange Slice() function? Wouldn't it be enough to use String.Format with a special format string? For example instead of writing

h1.Text = (value/phi).ToString().Slice(0, 4);

just write:

h1.Text = String.Format("{0:0.0}", value/phi);

...and so on?