How do you save an open document using Microsoft.Office.Interop.Excel.Application in C#?

Question

I have the following code:

        private void btnExcel_Click(object sender, EventArgs e)
    {
        if (dataGridView1.Rows.Count > 0)
        {
            Microsoft.Office.Interop.Excel.Application XcelApp = new Microsoft.Office.Interop.Excel.Application();


            XcelApp.Application.Workbooks.Add(Type.Missing);
            for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
            {
                XcelApp.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
            }
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                try // catches null cells and ignores
                {
                    for (int j = 0; j < dataGridView1.Columns.Count; j += 2)
                    {
                        XcelApp.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();

                    }
                }
                catch (NullReferenceException)
                {
                    
                }
                catch (Exception ex)
                {
                    
                    MessageBox.Show(ex.Message + "\n" + ex.InnerException);
                }
            }
             XcelApp.Columns.AutoFit();
             XcelApp.Visible = true;
            string pathway = @"C:\Temp\" + txtComputer.Text + "." + lblVersion.Text + "." + lblProduct.Text + ".csv";
            
            XcelApp.GetSaveAsFilename(pathway, "CSV (Comma Delimited) (*.csv), *.csv",2, DialogResult.OK);

        }
    }

This outputs a datagridview to an excel spreadsheet, opens it and then opens the save file dialogue box to save the document as CSV. I have several issues:

1. If I click save, it seems to ignore the save completely and no document is saved.
2. Ideally I'd like this to autosave, I'm not too bothered about it opening at all.
3. Excel.Application doesn't give a Save() or a SaveAs() method to do any of the above so I assume I am using the incorrect reference. What would I use so I can save this doc automatically?

Thanks

Answer 1

        private void btnExcel_Click(object sender, EventArgs e)
    {
        if (dataGridView1.Rows.Count > 0)
        {
            Microsoft.Office.Interop.Excel.Application XcelApp = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel.Workbook excelWorkBook = XcelApp.Workbooks.Add();

            for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
            {
                XcelApp.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
            }
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                try // catches null cells and ignores
                {
                    for (int j = 0; j < dataGridView1.Columns.Count; j += 2)
                    {
                        XcelApp.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();

                    }
                }
                catch (NullReferenceException)
                {
                    
                }
                catch (Exception ex)
                {
                    
                    MessageBox.Show(ex.Message + "\n" + ex.InnerException);
                }
            }

            string pathway = @"C:\Temp\" + txtComputer.Text + "." + lblVersion.Text + "." + lblProduct.Text + ".csv";
            excelWorkBook.SaveAs(pathway, Microsoft.Office.Interop.Excel.XlFileFormat.xlCSV); 
            XcelApp.Workbooks.Close();

        }
    }