C# string to combobox issues

Question

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(",");

Answer 1

IndexOf returns the first index of the string "," within removedelim. You're looking for Split.

string[] lines = 
    removedelim.Split(new string[] { "," }, StringSplitOptions.None);

Note that there is not an instance of Split that takes a single string (since some languages allow implicit conversion between string and char[], which would make overload resolution ambiguous and not easily corrected), so you have to use the overload that takes an array of delimiters and just provide one.

Answer 2

IndexOf returns an int, not a string array.

Answer 3

Well the error is pretty straightforward. IndexOf returns the integer position of the character you searched for. You need to do a Split instead of IndexOf.

Answer 4

String. IndexOf(Char) : Reports the index of the first occurrence of the specified Unicode character in this string.

sting.IndexOf(char) returns a int not a sting array.

Answer 5

Others have already spotted the mistake. Still there are problems with your code. All you need is following lines of code:

string[] startdelim = File.ReadAllLines(textBox1.Text);
comboBox1.Items.AddRange(startdelim[0].Replace("\","").Split(","));