Problem with Getting Selected Valued In CheckBoxList In Asp.net

hi

try this one 

Bind data to check box list trough database

public void bind()
        {
            chck_students.DataSource = dt;
            chck_students.DataValueField = "Id";
            chck_students.DataTextField = "Name";
            chck_students.DataBind();
        }

And this is Button click code (in this u can find out checked & unchecked items) 

 protected void btm_submit_final_Click(object sender, EventArgs e)
        {
            try
            {
                for (int counter = 0; counter < chck_students.Items.Count; counter++)
                {
                    if (chck_students.Items[counter].Selected)
                    {
                        //Selected
                    }
                    else
                    {
                        //not Selected
                    }
                }
            }
            catch (Exception ex)
            {
                
            }
        }