Why is Trim() Method not trimming?

[Lorebass]

***Please pretend that any "-" is actually a white space.***

I have a string DDInfo that has read a line from a text file and it says:

" //SORTLIB DD DSN=SYS1.SORTLI B,DISP=SHR---------------------------0000380"

I remove certain unnescesary information and come up with this:

"DSN=SYS1.SORTL IB,DISP=SHR--------------------------"

all i want to do is trim off the trailing whitespaces but the code i have will not do it.
this is the entirety of what happens to the string:

DDInfo = sLine.Remove(73);
DDInfo = DDInfo.Substring(16);
DDInfo.Trim();

The remove and first substring work perfectly but the problem is it still reads:

"DSN=SYS1.SORTL IB,DISP=SHR--------------------------"

Substring to remove the end doesn't work either.
I feel like im missing something here. Im using Visual studio 2008.

[Joseph Martell]

An interesting tip from the MSDN page on the Trim() method:

This method does not modify the value of the current instance. Instead, it returns a new string in which all leading and trailing white space characters found in the current instance are removed.

[Frinavale]

Strings are immutable. This is why the Trim method returns a new string instead of effecting the string that it is being called.

In other words, line 3 should be:

DDInfo = DDInfo.Trim();

-Frinny