C# .Net ช่วยดูโค้ด Import Text file ให้หน่อยครับ มัน Errors

private void btnLoadData_Click(object sender, EventArgs e)
        {
            string rowValue;
            string[] cellValue;

            if (System.IO.File.Exists(txtPath.Text))
            {
                System.IO.StreamReader streamReader = new StreamReader(txtPath.Text);

                // Reading header
                rowValue = streamReader.ReadLine();
                cellValue = rowValue.Split(',');
                for (int i = 0; i <= cellValue.Count() - 1; i++)
                {
                    DataGridViewTextBoxColumn column = new DataGridViewTextBoxColumn();
                    column.Name = cellValue[i];
                    column.HeaderText = cellValue[i];
                    dataGridView1.Columns.Add(column);
                }

                // Reading content
                while (streamReader.Peek() != -1)
                {
                    rowValue = streamReader.ReadLine();
                    cellValue = rowValue.Split(',');
                    dataGridView1.Rows.Add(cellValue);
                }

                streamReader.Close();
            }
            else
            {
                MessageBox.Show("No File is Selected");
            }
        }