Retrieving Excel Data and Binding to a ComboBox in C#

The following code snippet allows you to browser an excel file on your machine and get data from the Excel sheet and bind one column of the Excel sheet to a ComboBox control.

The code starts by creating a connection with the Excel sheet using OleDb data provider and retrieves all data in a DataSet and binds with a DataGridView control. 

 

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;

 

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);

            }

 

        }

    }

}

 

 

Thanks for reading.