how to export excel from sql database

Posted by Rock_Monu under ASP.NET on 2/15/2013 | Points: 10 | Views : 1253 | Status : [Member] | Replies : 1
how to export a datagrid view in excel format on a button...plz tell me..?




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Posted by: Satyapriyanayak on: 2/15/2013 [Member] [MVP] Silver | Points: 25

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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 Retrieving_excel_data_to_combobox_exportxls
{
public partial class Form1 : Form
{
public OleDbConnection con;
public void pintu(string s)
{
con = new OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0; " + "data source='" + s + " '; " + "Extended Properties=Excel 8.0;");

}
public OleDbCommand com;
public DataSet ds;
public OleDbDataAdapter oledbda;
public DataTable dt;
public string str;
public Form1()
{
InitializeComponent();
}

private void btnbrowse_Click(object sender, EventArgs e)
{
OpenFileDialog openfiledialog1 = new OpenFileDialog();
openfiledialog1.ShowDialog();
openfiledialog1.Filter = "allfiles|*.xls";
TextBox1.Text = openfiledialog1.FileName;
}

private void Form1_Load(object sender, EventArgs e)
{
comboBox1.Text = "Please select";
}

private void btndisplay_Click(object sender, EventArgs e)
{
pintu(TextBox1.Text);
try
{
con.Open();
str = "select * from [sheet1$]";
com = new OleDbCommand(str, con);
ds = new DataSet();
oledbda = new OleDbDataAdapter(com);
oledbda.Fill(ds, "[sheet1$]");
con.Close();
DataGridView1.DataSource = ds;
DataGridView1.DataMember = "[sheet1$]";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}


try
{
con.Open();
str = "select * from [sheet1$]";
com = new OleDbCommand(str, con);
oledbda = new OleDbDataAdapter(com);
ds = new DataSet();
oledbda.Fill(ds, "[sheet1$]");
con.Close();

dt = ds.Tables["[sheet1$]"];
int i = 0;
for (i = 0; i <= dt.Rows.Count - 1; i++)
{
comboBox1.Items.Add(dt.Rows[i].ItemArray[0]);
}
}
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 < DataGridView1.Columns.Count + 1; i++)
{
worksheet.Cells[1, i] = DataGridView1.Columns[i - 1].HeaderText;
}

for (int i = 0; i < DataGridView1.Rows.Count - 1; i++)
{
for (int j = 0; j < DataGridView1.Columns.Count; 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;
}
}
}
}

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