Programming Forums - array function, error in arrays.

Hey, I'm having trouble with a function, I want it to return all strings that have "Style: " at the beggining, they should return in an array. At first I was having errors because the array wasn't assigned, I assigned a null value but got another error lol. I tried the "ArrayList" too but couldnt get that to return properly. Also in msdn it said IndexOf will return 1 if the string is in, 0 if it is null, but mine returns 0 for all lines with "Style: ", A left() function would probably be better for me with this, as it will always be in the same place, else its invalid, but i couldnt find one :(. Heres the code:

public string[] setstyles()

        {

            if (textBox1.Text.Length > 1)

            {

                string[] stylearray = null;

                string[] file = textBox1.Text.Split('\n');



                int stylenum = 0;

                

                for (int i = 0; i < file.Length; i++)

                {

                    if (file[i].IndexOf("Style:") >= 0)

                    {

                        // is a style

                        stylearray[stylenum] = file[i]; 

                        

                        stylenum++;

                    }

                    else if ((file[i].IndexOf("Style: ") == 0) && (file[i].IndexOf("Dialogue: ") >= 0))

                    {

                        // styles cant be under dialogue lines, break loop.

                        break;

                    }

                }

                return stylearray;

            }

            else

            {

                return null;

            }

        }



        private void button2_Click(object sender, EventArgs e)

        {

       textBox1.Text = Convert.ToString(setstyles());

        }

Please help thanks! ~(^O^~)