format export to excel using closedxml with Title - export-to-excel

Question

I am exporting to excel using closedxml my code is working fine, but i want to format my exported excel file with a title, backgroundcolour for the title if possible adding image.
private void button4_Click(object sender, EventArgs e)
{
string svFileName = GetSaveFileName(Convert.ToInt32(comboBox1.SelectedValue));
DataTable dt = new DataTable();
foreach (DataGridViewColumn col in dataGridView1.Columns)
{
dt.Columns.Add(col.HeaderText);
}
foreach (DataGridViewRow row in dataGridView1.Rows)
{
DataRow dRow = dt.NewRow();
foreach (DataGridViewCell cell in row.Cells)
{
dRow[cell.ColumnIndex] = cell.Value;
}
dt.Rows.Add(dRow);
}
//if (!Directory.Exists(folderPath))
//{
// Directory.CreateDirectory(folderPath);
//}
if (svFileName == string.Empty)
{
DateTime mydatetime = new DateTime();
SaveFileDialog objSaveFile = new SaveFileDialog();
objSaveFile.FileName = "" + comboBox1.SelectedValue.ToString() + "_" + mydatetime.ToString("ddMMyyhhmmss") + ".xlsx";
objSaveFile.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
objSaveFile.FilterIndex = 2;
objSaveFile.RestoreDirectory = true;
string folderpath = string.Empty;
Cursor.Current = Cursors.WaitCursor;
if (objSaveFile.ShowDialog() == DialogResult.OK)
{
Cursor.Current = Cursors.WaitCursor;
FileInfo fi = new FileInfo(objSaveFile.FileName);
folderpath = fi.DirectoryName;
int rowcount = 0;
int sheetcount = 1;
int temprowcount = 0;
using (XLWorkbook wb = new XLWorkbook())
{
var ws = wb.Worksheets.Add(dt,comboBox1.Text.ToString() + sheetcount.ToString());
ws.Row(1).Height=50;
//ws.FirstRow().Merge();
ws.Row(1).Merge();
//ws.Row(1).Value = comboBox1.Text.ToString();
//ws.Row(1).Cell(1).im
ws.Row(1).Cell(1).Value = comboBox1.Text.ToString();
ws.Row(1).Cell(1).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
ws.Row(1).Cell(1).Style.Alignment.Vertical=XLAlignmentVerticalValues.Center;
ws.Row(1).Cell(1).Style.Fill.BackgroundColor = XLColor.Red;
ws.Row(1).Cell(1).Style.Font.FontColor = XLColor.White;
ws.Row(1).Cell(1).Style.Font.FontSize = 21;
ws.Row(1).Cell(1).Style.Font.Bold = true;
ws.Column(1).Merge();
ws.Column(1).Style.Fill.BackgroundColor = XLColor.Red;
ws.Cell(2, 2).InsertTable(dt);
wb.SaveAs(fi.ToString());
//wb.SaveAs(folderpath + "\\" + comboBox1.SelectedItem.ToString() + "_" + mydatetime.ToString("ddMMyyhhmmss") + ".xlsx");
//rowcount = 0;
//sheetcount++;
//}
}
//}
MessageBox.Show("Report (.xlxs) Saved Successfully.");
}
}
else
{
Cursor.Current = Cursors.WaitCursor;
string folderpath = string.Empty;
folderpath = Properties.Settings.Default.ODRSPath + "\\" + svFileName;
using (XLWorkbook wb = new XLWorkbook())
{
//DateTime mydatetime = new DateTime();
wb.Worksheets.Add(dt, comboBox1.SelectedItem.ToString());
wb.SaveAs(folderpath);
}
MessageBox.Show("Report (.xlxs) Saved Successfully.");
}
}