In this blog we will know how to populate one column from
excel to combobox. Also show all columns in a data gridview. Then export the
combobox values to another excel sheet.
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
{
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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