C# Excel-Datei in der Konsole ausgeben mit C#

/// <summary>
        /// Liest eine Exceldatei ein und erstellt aus ihr ein DataTable
        /// </summary>
        /// <param name="excelFile"></param>
        /// <returns></returns>
        private DataTable excelToDataTable(string excelFile)
        {            
            //Verbindung zu Excel mittels OleDb
            string sConnection = $"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={excelFile};Extended Properties=\"Excel 12.0;HDR=No;IMEX=1\"";

            using (OleDbConnection oleExcelConnection = new OleDbConnection(sConnection))
            {
                oleExcelConnection.Open();
                //Herausfinden, wie das sheet heißt
                DataTable dtTablesList = oleExcelConnection.GetSchema("Tables");
                string sSheetName = null;
                if (dtTablesList.Rows.Count > 0)
                {
                    sSheetName = dtTablesList.Rows[0]["TABLE_NAME"].ToString();
                }
                dtTablesList.Clear();
                dtTablesList.Dispose();
                //Daten auslesen
                if (!string.IsNullOrEmpty(sSheetName))
                {
                    OleDbDataAdapter excelDataAdapter = new OleDbDataAdapter("Select * From [" + sSheetName + "]", oleExcelConnection);
                    DataSet excelData = new DataSet();
                    excelDataAdapter.Fill(excelData);
                    //Erste Tabelle auslesen und in DataTable umwandeln
                    DataTable returnTable = excelData.Tables[0];
                    //Die Werte der ersten Zeile zu Spaltennamen machen
                    if (returnTable.Rows.Count > 0)
                    {
                        for (int i = 0; i < returnTable.Rows[0].ItemArray.Count(); i++)
                        {                            
                            returnTable.Columns[i].ColumnName = returnTable.Rows[0].ItemArray[i].ToString();
                        }
                        //Die erste Zeile daraufhin entfernen, sie enthält schließlich nur die Spaltennamen
                        returnTable.Rows.RemoveAt(0);
                    }

                    return returnTable;
                }
                else
                {
                    //Wenn kein Sheet gefunden wird, ist der Rückgabewert null
                    return null;
                }
            }
        }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ImportCSVFile
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnImport_Click(object sender, EventArgs e)
        {
            Cursor = Cursors.WaitCursor;

            DataTable importData = GetDataFromFile();

            if (importData == null) return;
                SaveImportDataToDatabase(importData);

            MessageBox.Show("Import Complete");
            txtFileName.Text = string.Empty;

            Cursor = Cursors.Default;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {

            OpenFileDialog ofd = new OpenFileDialog();
            ofd.DefaultExt = ".csv";
            ofd.Filter = "Comma Separated (*.csv)|*.csv";
            ofd.ShowDialog();

            txtFileName.Text = ofd.FileName;
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private DataTable GetDataFromFile()
        {
            DataTable importedData = new DataTable();
            try
            {
                using (StreamReader sr = new StreamReader("txtFileName.Text"))
                {

                    string header = sr.ReadLine();
                    if (string.IsNullOrEmpty(header))
                    {
                        MessageBox.Show("No file data");
                        return null;
                    }

                    string[] headerColumns = header.Split(',');
                    foreach (string headerColumn in headerColumns)
                    {
                        importedData.Columns.Add(headerColumn);
                    }

                    while (!sr.EndOfStream)
                    {
                        string line = sr.ReadLine();

                        if (string.IsNullOrEmpty(line)) continue;

                        string[] fields = line.Split(',');

                        DataRow importedRow = importedData.NewRow();

                        for (int i = 0; i < fields.Count(); i++)
                        {
                            importedRow[i] = fields[i];
                        }

                        importedData.Rows.Add(importedRow);

                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("The file could not be read:");
                Console.WriteLine(e.Message);
            }
            return importedData;
        }

        private void SaveImportDataToDatabase(DataTable importData)
        {
            using (SqlConnection conn = new SqlConnection("Server=localhost; Database=TestDB;Trusted_Connection=True;"))
            {
                conn.Open();
                foreach (DataRow importRow in importData.Rows)
                {
                    SqlCommand cmd = new SqlCommand("INSERT INTO ImportData (StatioID, ClientID, rate, ShowTitleID) " +  
                                                    "VALUES (@stationId, @clientId, @rate, @showTitleID)", conn);

                    cmd.Parameters.AddWithValue("@stationId", importRow["StationID"]);
                    cmd.Parameters.AddWithValue("@clientId", importRow["ClientID"]);
                    cmd.Parameters.AddWithValue("@rate", importRow["rate"]);
                    cmd.Parameters.AddWithValue("@showTitleID", importRow["ShowTitleID"]);

                    cmd.ExecuteNonQuery();
                }
            }
        }
    }
}

INSERT INTO dbo.ImportData
SET StationID = 1, 
ClientID = 1, 
rate = 1, 
ShowTitleID = 1

SELECT TOP (1000) [Id]
      ,[ImportDate]
      ,[StationID]
      ,[ClientID]
      ,[rate]
      ,[ShowTitleID]
  FROM [TestDB].[dbo].[ImportData]

INSERT INTO dbo.ImportData
(StationID, ClientID, rate, ShowTitleID)
VALUES (1, 1, 1, 1)