Is there any way to split the text file data using delimiters ans show it in textboxes?

Question

Here is the original data saved in text file

zeeshan
adnan
shams
jawaid

and I want this data in separate 4 textboxes by searching the first name.

Here is my code:

private void button1_Click(object sender, EventArgs e)
{
    FileStream file = new FileStream(@"C:\Users\Zeeshan\Downloads\a.txt", FileMode.Open, FileAccess.Read);
    StreamReader sr = new StreamReader(file);
    sr.ReadLine();
    var textLines = File.ReadAllLines(@"C:\Users\Zeeshan\Downloads\a.txt");

    foreach (var Line in textLines)
    {
        // (str, "\n\\s*")
        //string[] dataArray = Regex.Split('n');
        string[] dataArray = Line.Split(new string[] { System.Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
        dataArray[0].CompareTo(comboBox1.SelectedItem);
        if (dataArray[0] == comboBox1.SelectedItem.ToString())
        {
            textBox1.Text = (dataArray[0]);
            textBox2.Text = (dataArray[1]);
            textBox3.Text = (dataArray[2]);
            textBox4.Text = (dataArray[3]);
        }
    }
}

The problem with this code is that when I press the button it shows an exception at index[1].

Error is:

"Index was outside the bounds of the array."

Answer 1

You have several problems in your code:

// FileStream file = new FileStream(@"C:\Users\Zeeshan\Downloads\a.txt", FileMode.Open, FileAccess.Read);
// StreamReader sr = new StreamReader(file);
// sr.ReadLine();
// Above three lines are redundant, because you read all of the text inside next line (ReadAllLines)
var textLines = File.ReadAllLines(@"C:\Users\Zeeshan\Downloads\a.txt");

// This foreach loop is wrong, since textLines already is array of lines from text file (each element is already single line without Environment.NewLine characters)
/*foreach (var Line in textLines)
{
    // (str, "\n\\s*")
    //string[] dataArray = Regex.Split('n');
    string[] dataArray = Line.Split(new string[] { System.Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
    // This CompareTo is redundant also, since you are not using its result
    dataArray[0].CompareTo(comboBox1.SelectedItem);
    if (dataArray[0] == comboBox1.SelectedItem.ToString())
    {
        textBox1.Text = (dataArray[0]);
        textBox2.Text = (dataArray[1]);
        textBox3.Text = (dataArray[2]);
        textBox4.Text = (dataArray[3]);
    }
}*/

// Instead of foreachloop above, you just need to put values inside textboxes:
if (textLines[0] == comboBox1.SelectedItem.ToString())
{
    textBox1.Text = (textLines[0]);
    textBox2.Text = (textLines[1]);
    textBox3.Text = (textLines[2]);
    textBox4.Text = (textLines[3]);
}