C#

lst2.ValueMember = "SubjectId";
      lst2.DisplayMember = "SubjectName";
      lst2Items.Add(lst1.SelectedItem);

string x = "control_name";<br />
this.Controls[x].Visible = false;

//This is the Form1 Code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using ourLibrary;

namespace MonitoringCheckList2009
{
    public partial class BaseForm : Form
    {
    //Here I want to use the method written in class1.cs file

    }
}

// This is Diferent class file code.
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace ourLibrary
{
    public class LibraryClass
    {
        
        public void ShowLC(string dbTable, Control LstBox)
        {
         // Here I want to write a method and want to access the controls
          in form1.
        }
    }
}

LibraryClass lc = new LibraryClass();
lc.ShowLC ("some string", this.listBox1);