C#

foreach (string s in lines)
{
    string[] fragments = s.Split(',');
    errors.Text += fragments[0] + " ";
    errors.Visible = true;
}

Keith Barrow wrote:

errors.Text += fragments[0] + " ";

foreach (string s in lines)
{
   string[] fragments = s.Split(',');
   errors.Text = fragments[0];
   errors.Visible = true;
}

foreach (string s in lines)
{
   string[] fragments = s.Split(',');
   errors.Text += fragments[0];
   errors.Visible = true;
}

string[] fragments = lines[0].Split(',');
errors.Text += fragments[0];
errors.Visible = true

string[] fragments = lines[0].Split(',');

1. Create a list of errors and add to it in the loop.
2. Only register the first error and continue processing.
3. Break out of the loop if an error is found.

manager = new data_manager();
            HttpPostedFile myFile = files.PostedFile;// Get a reference to PostedFile object
            string strFilename = Path.GetFileName(myFile.FileName);
            if (strFilename != "")
            {
                string[] lines = File.ReadAllLines(strFilename);
                for (int b = 0; b < lines.Length; b++)
                {
                    string[] fragments = lines[b].Split(',');
                    int count = lines.Length;
                    errors.Text = fragments[0] + count.ToString();
                    errors.Visible = true;
                    string first = fragments[0]; string last = fragments[1]; string email = fragments[2];
                    string phone = fragments[3]; string birth = fragments[4];
                    string addrecord = manager.AddContact(first, last, email, phone, birth, Request.QueryString["userid"]);

                    if (addrecord == "done")
                    {
                        error.Text = "Contact added check in the table below!";
                        error.Visible = true;
                        FillContacts(Request.QueryString["userid"]);//update datagrid after deleting a contact
                    }
                    else
                    {
                        error.Text = addrecord;
                        error.Visible = true;
                    }
                }
            }
            else
            {
                errors.Text = "No file with content was selected";
                errors.Visible = true;
            }

string[] lines = File.ReadAllLines(strFilename);
string[] fragments = lines[0].Split(',');
errors.Text += fragments[0];
errors.Visible = true;