Checkbox with C#

Hi all ,

I have some table that look like ( see screenshot) also I attached the application.

I would like to display in my app just the rows with the false result in column "Closed".

Here is my combobox code:

//combobox lastname display in the textboxs
        private void comboLname_SelectedIndexChanged(object sender, EventArgs e)
        {
            string conn = "Data Source=srv-db-02;Initial Catalog=RMSCRM;Persist Security Info=True;User ID=test;Password=masterB4";
            string Query = "select * from RMSCRM.dbo.sales where LastName= '" + comboLname.Text + "' ;";


            SqlConnection Myconn = new SqlConnection(conn);
            SqlCommand cmdDataBase = new SqlCommand(Query, Myconn);
            SqlDataReader Reader;
            try
            {
                Myconn.Open();
                Reader = cmdDataBase.ExecuteReader();
                if (Reader.Read())
                {
                    string ID = Reader.GetInt32(Reader.GetOrdinal("ID")).ToString();
                    string AccountNuber = Reader.GetString(Reader.GetOrdinal("AccountNumber")).ToString();
                    string Time = Reader.GetDateTime(Reader.GetOrdinal("Time")).ToString();
                    string Deposit = Reader.GetDecimal(Reader.GetOrdinal("Deposit")).ToString();
                    string slastname = Reader.GetString(Reader.GetOrdinal("lastname"));
                    string sname = Reader.GetString(Reader.GetOrdinal("name"));
                    string semail = Reader.GetString(Reader.GetOrdinal("emailaddress"));
                    bool scheck = Reader.GetBoolean(Reader.GetOrdinal("closed"));
                    int statusIndex = Reader.GetOrdinal("status");
                    string sstatus = Reader.IsDBNull(statusIndex) ? null : Reader.GetString(statusIndex);
                    int noteIndex = Reader.GetOrdinal("Note");
                    string snote = Reader.IsDBNull(noteIndex) ? null : Reader.GetString(noteIndex);
                    //int historyIndex = Reader.GetOrdinal("history");
                    //string slbox = Reader.IsDBNull(historyIndex) ? null : Reader.GetString(historyIndex);

                 
             

            

                    txtid.Text = ID;
                    txtacnum.Text = AccountNuber;
                    txttime.Text = Time;
                    txtdeposit.Text = Deposit;
                    txtlname.Text = slastname;
                    txtStatus.Text = sstatus;
                    txtNote.Text = snote;
                    txtName.Text = sname;
                    txtEmail.Text = semail;
                    checkBox1.Checked = scheck;

                    
                    
                    
                    
                    
                    //close reader ready for our next query
                    Reader.Close();
                    cmdDataBase.CommandText = "SELECT * FROM History WHERE SalesID=@SalesID";


                    //add parameter to salesID
                    cmdDataBase.Parameters.Clear();
                    cmdDataBase.Parameters.AddWithValue("@SalesID", ID);

                    Reader = cmdDataBase.ExecuteReader();

                    //cleare and repopulate listbox
                    listBox1.Items.Clear();

                    while (Reader.Read())
                    {
                        listBox1.Items.Add(Reader.GetString(Reader.GetOrdinal("History")));
                    }

      

                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                Myconn.Close();
            }
        }

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