What i'm trying to do is read in a header row of a file to a combobox. Here is my code:

   private void button4_Click(object sender, EventArgs e)
    {
        string[] startdelim = File.ReadAllLines(textBox1.Text);
        int counter = 1;
        foreach (string delim in startdelim)
        {
            if (counter == 1)
            {
                string removedelim = delim.Replace("\"", "");
                string[] lines = removedelim.IndexOf(",");
                foreach (string line in lines)
                {
                    comboBox1.Items.Add(line);
                }
             }
            counter++;
        }

for some reason it keeps telling me Error Cannot implicitly convert type 'int' to 'string[]' at string[] lines = removedelim.IndexOf(",");