string problem

hi guys i m beginner in c# and i wand a help with strings!
i have search for help 3months ago but i start agen the project now

i have design a micro controller project that sen in serial port some character strings that contains at the beginning three characters!

the characters is two dashhes ## with a number inside
e.g. #1#

the micro controller part working OK bun th c# software that read this data i have problem with the strings!

i recive data with the

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{

//RxString = serialPort1.ReadExisting();
RxString = serialPort1.ReadLine();
this.Invoke(new EventHandler(DisplayText));
}

and display with

private void DisplayText(object sender, EventArgs e)
{

textBox1.AppendText(RxString);

}

this works but i wand when the string detect #1# to display the rest characters of string in first line and when detects #2# to display in second line!

string format example

#1#vdfkm fskjf jklfkgj #2#kfldjdfgbkdj #1#mlkfjgvfdjgdf...........

can someone help me on this

thanks and sorry for my bad english

If you mean that you want the textbox display to be like this:

vdfkm fskjf jklfkgjmlkfjgvfdjgdf
kfldjdfgbkdj

then try the following:

            RxString = serialPort1.ReadLine();
            if (RxString.Length > 3 && RxString[0] == '#' && RxString[2] == '#')
            {
                lineNum = (int)RxString[1] - 48;
                lines[lineNum - 1] += RxString.Substring(3);
            }
            else
            {
                // append to 'current' line
                lines[lineNum - 1] += RxString;
            }

this.Invoke(new EventHandler(DisplayText));

// add some fields

private string[] lines = new string[9] { "", "", "", "", "", "", "", "", "" };
private int lineNum = -1;

            private void DisplayText(object sender, EventArgs e)
            {
               textBox1.Lines = lines;
            }