ASP.NET

Excel

  private void ExportToExcel(DataTable tb)
        {
            // Creating a Excel object. 
            Microsoft.Office.Interop.Excel._Application excel = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel._Workbook workbook = excel.Workbooks.Add(Type.Missing);
            Microsoft.Office.Interop.Excel._Worksheet worksheet = null;
                       
            try
            {

                worksheet = workbook.ActiveSheet as Microsoft.Office.Interop.Excel._Worksheet;

                Microsoft.Office.Interop.Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[tb.Rows.Count + 1, tb.Columns.Count]);
                range.NumberFormat = "@";

                worksheet.Name = "ExportedFromDatGrid";

                int cellRowIndex = 1;
                int cellColumnIndex = 1;

                //Loop through each row and read value from each column. 
                for (int i = 0; i < tb.Rows.Count + 1 ; i++)
                {
                    for (int j = 0; j < tb.Columns.Count; j++)
                    {
                        // Excel index starts from 1,1. As first Row would have the Column headers, adding a condition check. 
                        if (cellRowIndex == 1)
                        {
                            worksheet.Cells[i+1, j+1] = tb.Columns[j].ColumnName;
                        }
                        else
                        {                          
                            worksheet.Cells[i+1, j+1] = tb.Rows[i-1][j].ToString();
                        }
                        cellColumnIndex++;
                    }
                    cellColumnIndex = 1;
                    cellRowIndex++;
                }

                //Getting the location and file name of the excel to save from user. 
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.Filter = "Excel files (*.xlsx)|*.xlsx|All files (*.*)|*.*";
                saveDialog.FilterIndex = 2;

                if (saveDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                  
                    workbook.SaveCopyAs(saveDialog.FileName + ".xlsx");
                    MessageBox.Show("Export Successful");
                }
            }
            catch (System.Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                excel.Quit();
                workbook = null;
                excel = null;
            }

        }