how export data in excel from datagridview only that column that are visible in datagridviwe if column is visible false they not transfer..

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C#

my code is like that but this code all the data of gridview trnsfer i transfer only thta visible datagrid view colmun if column visble false they they not export to excel...

if (dataGridView1.DataSource == null)
            {
                MessageBox.Show("Sorry nothing to export into excel sheet..", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            int rowsTotal = 0;
            int colsTotal = 0;
            int I = 0;
            int j = 0;
            int iC = 0;
            System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor;
            Excel.Application xlApp = new Excel.Application();
 
            try
            {
                Excel.Workbook excelBook = xlApp.Workbooks.Add();
                Excel.Worksheet excelWorksheet = (Excel.Worksheet)excelBook.Worksheets[1];
                xlApp.Visible = true;
                xlApp.Columns[3].Cells.NumberFormat = "@";
                rowsTotal = dataGridView1.RowCount - 1;
                colsTotal = dataGridView1.Columns.Count - 1;
                var _with1 = excelWorksheet;
                _with1.Cells.Select();
                _with1.Cells.Delete();
                for (iC = 0; iC <= colsTotal; iC++)
                {
                    _with1.Cells[1, iC + 1].Value = dataGridView1.Columns[iC].HeaderText;
                }
                for (I = 0; I <= rowsTotal - 1; I++)
                {
                    for (j = 0; j <= colsTotal; j++)
                    {
                        _with1.Cells[I + 2, j + 1].value = dataGridView1.Rows[I].Cells[j].Value;
                    }
                }
                _with1.Rows["1:1"].Font.FontStyle = "Bold";
                _with1.Rows["1:1"].Font.Size = 12;
 
                _with1.Cells.Columns.AutoFit();
                _with1.Cells.Select();
                _with1.Cells.EntireColumn.AutoFit();
                _with1.Cells[1, 1].Select();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                //RELEASE ALLOACTED RESOURCES
                System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Default;
                xlApp = null;
            }