c# - Colorful text on custom text editor -

i've created custom text editor c# . now, add syntax highlighting feature coloring last letter/number inputted, in way color used drawn on random basis . how can so, though? tried bunch of alternative ways none worked . recommendations! (note: i've been coding 2 months. sorry mistakes ! )

latest example :

    private void usertb_keypress(object sender, keypresseventargs e)     {          random rnd = new random();          color randomcolor = color.fromargb(rnd.next(255), rnd.next(255), rnd.next(255));          usertb.selectioncolor = randomcolor;          } 

try putting "static" in front of variable declaration.

       static random rnd = new random(); 

your code getting fired off button event, , random variable getting created anew each time button clicked, , begins random sequence @ same starting point each time.

===== grayish? hmm. try perhaps...

    static random rnd = new random();     static int r1;     static int r2;     static int r3;      r1 = rnd.next(255);     r2 = rnd.next(255);     r3 = rnd.next(255);     color randomcolor = color.fromargb(r1, r2, r3); 

and take @ r1, r2, , r3 values in debugger.