How to check a item in checkboxlist1 when a item in checkboxlist2 is checked?

Let you have a table having data database table named Students as follows
ID   |	Roll     | Name
------------------------
1    |	0718004	 | Anis
------------------------
2    | 0718003   | Asad
-----------------------
3    | 0718002   | Toma
-----------------------

In aspx

<div>
<h3>Select Name </h3>
<asp:checkboxlist id="CheckBoxListName" autopostback="true" onselectedindexchanged="CheckBoxListName_SelectedIndexChanged" runat="server" xmlns:asp="#unknown"></asp:checkboxlist>
<h3>Select Roll</h3>
<asp:checkboxlist id="CheckBoxListRoll" autopostback="true" onselectedindexchanged="CheckBoxListRoll_SelectedIndexChanged" runat="server" xmlns:asp="#unknown"></asp:checkboxlist>
</div>

In .cs (Code behind) using Entity Framework

  public partial class _Default : System.Web.UI.Page
    {
           

	  BooksDBEntities db = new BooksDBEntities();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
              
                List<student> lstStudents = new List<student>();
                lstStudents = db.Students.ToList();
                //filling Names checkboxlist
                foreach (Student s in lstStudents)
                {
                    ListItem li = new ListItem();
                    li.Text = s.Name;
                    li.Value = s.Roll;

                    CheckBoxListName.Items.Add(li);
                }

                //filling Roll Checkboxlist

                foreach (Student s in lstStudents)
                {
                    ListItem li = new ListItem();
                    li.Text = s.Roll;
                    li.Value = s.Roll;
                    CheckBoxListRoll.Items.Add(li);
                }
                //


            }

        }
		
		 protected void CheckBoxListName_SelectedIndexChanged(object sender, EventArgs e)
        {
            foreach (ListItem li in CheckBoxListName.Items)
            {
               
                    CheckBoxListRoll.Items.FindByValue(li.Value).Selected = li.Selected;
          
            
            }
        
        }

        protected void CheckBoxListRoll_SelectedIndexChanged(object sender, EventArgs e)
        {

            foreach (ListItem li in CheckBoxListRoll.Items)
            {
                CheckBoxListName.Items.FindByValue(li.Value).Selected = li.Selected;

            }
        }
		
		
		}
</student></student>

Using above code if you select a roll number say 0718004 then the in checkboxlist for Name will automatically select Anis and vice versa. I have link wherein I provided the complete solution you can download. If it works then upvote and accept as answer