export data from my database and create excel file and insert this data to the excel file

Question

hi all am working on visual studio 2010 using c#and i have a form that have combobox that have my courses  now i want to select any course and then click on a button to select a place to save the file i want to create and insert in that excel file student full name  ID and the marks of these students how is that  plz i need ready code for this solution thx all.

Satyapriya Nayak · Answer

Hi Younis Try this... using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.OleDb; using System.IO; namespace Export_to_Excel_in_windows { public partial class Form1 : Form { string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings[dsn]; OleDbCommand com; DataSet ds; OleDbDataAdapter oledbda; DataTable dt; string str; public Form1() { InitializeComponent(); } private void btndisplay_Click(object sender EventArgs e) { try { OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = select * from emp; com = new OleDbCommand(str con); ds = new DataSet(); oledbda = new OleDbDataAdapter(com); oledbda.Fill(ds emp); con.Close(); DataGridView1.DataSource = ds; DataGridView1.DataMember = emp; } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void btn_export_Click(object sender EventArgs e) { //We have to add a reference to the Microsoft Excel object library. //Right click on your project and select Add Reference menu. After that go to COM tab and select and add Microsoft Excel 12.0 object library. Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application(); Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing); Microsoft.Office.Interop.Excel._Worksheet worksheet = null; app.Visible = true; try { worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets[Sheet1]; worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.ActiveSheet; worksheet.Name = Exported from DataGridView; for (int i = 1; i { worksheet.Cells[1 i] = DataGridView1.Columns[i - 1].HeaderText; } for (int i = 0; i { for (int j = 0; j { worksheet.Cells[i + 2 j + 1] = DataGridView1.Rows[i].Cells[j].Value.ToString(); } } string fileName = String.Empty; saveFileExcel.Filter = Excel files |*.xls|All files (*.*)|*.*; saveFileExcel.FilterIndex = 2; saveFileExcel.RestoreDirectory = true; if (saveFileExcel.ShowDialog() == DialogResult.OK) { fileName = saveFileExcel.FileName; workbook.SaveAs(fileName Type.Missing Type.Missing Type.Missing Type.Missing Type.Missing Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive Type.Missing Type.Missing Type.Missing Type.Missing Type.Missing); } else return; } catch (System.Exception ex) { MessageBox.Show(ex.Message); } finally { app.Quit(); workbook = null; app = null; } } } } Thanks

younis abdeljawwad · Answer

what do you mean here by this string  you want to connect to the database !! i got error here string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings[dsn]; also an error here at this word !! saveFileExcel