C# work with dll file

Question

For a C# 2008 application, I need to add a specfic dll file to an existing application and have all the project files that need to work with it reference this dll file.

Since I have never added a dll file to a solution and I have very limited experience working with C#, can you tell and/or show me how to add a dll file to a C# 2008 solution file and have all the applicable project files access this required dll file?

Answer 1

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 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);
            }

        }
    }
}

Answer 2

I got the answer guys..

 private void button1_Click(object sender, EventArgs e)

        {

            OpenFileDialog ofImport = new OpenFileDialog();

            ofImport.Title = "Select file";

            ofImport.InitialDirectory = @"c:\";

            ofImport.FileName = openFileDialog1.FileName;

            ofImport.Filter = "Excel Sheet(*.xlsx)|*.xlsx|All Files(*.*)|*.*";

            ofImport.FilterIndex = 1;

            ofImport.RestoreDirectory = true;

            if (ofImport.ShowDialog() == DialogResult.OK)

            {

                string path = System.IO.Path.GetFullPath(ofImport.FileName);

                string query = "SELECT * FROM [Sheet1$]";

                OleDbConnection conn = new OleDbConnection();

                conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ofImport.FileName + ";Extended Properties=" + "\"Excel 12.0 Xml;HDR=YES;IMEX=1\"";

                OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn);

                DataSet dataSet = new DataSet();

                adapter.Fill(dataSet);

                dataGridView1.DataSource = dataSet.Tables[0];

            }

            else

            {

                ofImport.Dispose();

            }   

        }