c# - Richtextbox prepend new text with color -

i have used richtextbox display logs in winforms.

language used c#.

the software used inserting data of bank branches , after start of new branch want display text new color.

i have seen link color different parts of richtextbox string , implemeted successfully.

my problem want prepend new line instead of append. new line displayed on top.

i able changing code box.text=datetime.now.tostring("dd-mm-yyyy-hh-mm-ss") + ": " + text + box.text

but color changing entire text.

this procedure used append

            box.selectionstart = box.textlength;         box.selectionlength = 0;          box.selectioncolor = color;          box.appendtext(datetime.now.tostring("dd-mm-yyyy-hh-mm-ss") + ": " + text);         box.selectioncolor = box.forecolor; 

this have done:

            box.text=datetime.now.tostring("dd-mm-yyyy-hh-mm-ss") + ": " + text + box.text;         box.selectionstart = 0;         box.selectionlength = text.length;         box.selectioncolor = color; 

but not working.

1) never directly change text property of formatted richttextbox

2) append use rtb.appendtext function

3) insert @ other position p, including beginning use this:

rtb.selectionstart = s;            // set cursor target position rtb.selection.length = 0;          // nothing selected, yet rtb.selectedtext = yournewtext;    // inserts new text  

now can add formatting want:

rtb.selectionstart = s;            // prepare new formatting.. rtb.selectionlength = yournewtext.length;   //.. selecting text rtb.selectioncolor = color.blue;   // and/or whatever want do.. ...