How to use multi color in richtextbox [duplicate]

Answer 1

you can use Run object to change the color at runtime

private Run GetForegroundColor(string strInformation, Brush color)
        {
            Run noramlRun = new Run(strInformation);
            noramlRun.Foreground = color;
            return noramlRun;
        }

for more complex scenario like change the color based on requirement then visit blow link

https://sites.google.com/site/greateindiaclub/mobil-apps/windows8/customwpfrichtextboxwithcolorchangeandhighlightfunctionality