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#5.0

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;
           }