private void button4_Click(object sender, EventArgs e)
{
var openFileDialog1 = new OpenFileDialog {
Filter = @"Csv File(*.csv)|*.csv|All files(*.*)|*.*"
};
if (openFileDialog1.ShowDialog() != DialogResult.OK)
{
return;
}
var fileName = openFileDialog1.FileName;
var data = CsvReader.ReadCsv(fileName);
DataController.AddFourthData(data);
DataController.AddFourthPoints(CsvConverter.ConvertDataToPoints(data));
button4.Text = fileName;
}