Reverse string including multiline

Question

Hi
I try to take a string from multi line text box call "ReqText"
Reverse the string, then take him again to the text box
It is works, my problem is that: from multiline text it is became to single line
My code:
 char[] arr = ReqText.Text.ToCharArray(); // converting the textbox to char arrayArray.Reverse(arr); // reversing the text

ReqText.Text = strReversed;
string strReversed = new string(arr);

any help?
I try to repeat the reverse string as muliline again

 Thanks,