String.Replace not replacing vbCrlf - asp.net

Question

I am trying to replace all the occurrences of "\n" in the Text property of an ASP.NET TextBox with <br /> using String.Repalce function, but it doesn't seem to work:
taEmailText.Text.Replace("\n", "<br />")
As a solution I am using Regex.Replace:
New Regex("\n").Replace(taEmailText.Text, "<br />")
My question is why String.Replace can't find "\n" for me, even though this solution has been proposed on many sites and it has worked for many people.
Thanks,

Answer 1

In .NET string objects are immutable, so String.Replace returns a new string with the replacement. You need to assign the result:
taEmailText.Text = taEmailText.Text.Replace("\n", "<br />")
Also, rather than creating a new Regex object—when you do need a regular expression—then there are static methods available:
result = Regex.Replace(input, pattern, replacement)
Edit (based on comment):
Just tested this:
Sub Main()
Dim result As String = "One\nTwo".Replace("\n", "<br />")
Console.WriteLine(result)
End Sub
and the result is:
One<br />Two

Answer 2

The problem is the result of the method call is immediated forgotten. You should read MSDN documentation a bit more carefully:
Returns a new string in which all occurrences…
Hence do:
taEmailText.Text = taEmailText.Text.Replace("\n", "<br />")

Answer 3

Replace does not change the content of the input string. It returns newly created string.
You might want to replace both \r and \n or use Environment.NewLine constant.
var replacedText = TextBox1.Text.Replace(Environment.NewLine, "<br />");