C#

string oradb = "Data Source=(DESCRIPTION="
               + "(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=ORASRVR)  (PORT=1521)))"
               + "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=mariam)));"
               + "User Id=system;Password=mariam;";
OracleConnection conn = new OracleConnection(oradb);  // C#
               conn.Open();

string strCon = "Driver={Microsoft ODBC for Oracle};SERVER = 10.17.18.62; Uid=system;Pwd=mariam;";
              OdbcConnection odbc_Con = new OdbcConnection("Driver={Microsoft ODBC for Oracle};Server=DEDICATED; UID=system;PWD=mariam;");
                odbc_Con.ConnectionString = "Driver={Microsoft ODBC for Oracle};Server=DEDICATED; UID=system;PWD=mariam;";
              odbc_Con.Open();

string strCon = "Driver={Microsoft ODBC for Oracle};SERVER = 10.17.18.62; Uid=system;Pwd=mariam;";
               OleDbConnection  oracleConn = new OleDbConnection();
               oracleConn.ConnectionString = "Provider=\"OraOLEDB.Oracle.1\";User ID=system;Password=mariam; Data Source=XE; Extended Properties=\"\"; Persist Security Info=False ";
            oracleConn.Open();

Dim aPath As String = Application.ExecutablePath()

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration.Install;
using Microsoft.Win32;
using System.IO;


namespace BHOPDF
{
    [RunInstaller(true)]
    public partial class Installer1 : Installer
    {
        public Installer1()
        {
            InitializeComponent();
        }

       [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
        public override void Commit(System.Collections.IDictionary savedState)
        {
                base.Commit(savedState);
        }



        [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
        public override void Install(System.Collections.IDictionary stateSaver)
        {
            base.Install(stateSaver);
        }
      
       
        [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
        protected override void OnCommitting(System.Collections.IDictionary savedState)
        {
            // Get the location of regasm
            string regasmPath = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory() + @"regasm.exe";
            // Get the location of our DLL
            string componentPath = typeof(Installer1).Assembly.Location;
              // Execute regasm
            System.Diagnostics.Process.Start(regasmPath, "/codebase \"" + componentPath + "\"");
            base.OnCommitting(savedState);
        }

    
       
        [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
        protected override void OnAfterInstall(System.Collections.IDictionary savedState)
        {
            base.OnAfterInstall(savedState);
        }

     
       
        [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
        protected override void OnBeforeUninstall(System.Collections.IDictionary savedState)
        {   string regasmPath = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory() + @"regasm.exe";
            // Get the location of our DLL
            string componentPath = typeof(Installer1).Assembly.Location;
            // Execute regasm
            System.Diagnostics.Process.Start(regasmPath, "/u \"" + componentPath + "\"");
          
            base.OnBeforeUninstall(savedState);

        }

       
       
        [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
        public override void Uninstall(System.Collections.IDictionary savedState)
        {
         
            base.Uninstall(savedState);
        }

    }
}