convert checkbox into textbox(message) in datagridview directly from sql while running the program

i have a sql table like  

                           in datagridview   shows like                     

SNo-------int                                   1,2,----

Date------nvarchar(50)                      2016-02-10

time------nvarchar(50)                              4:50:00PM

shift------varchar(50)                                 A/B/C

status------bit                                        chechbox(tick mark)

barcodename---varchar(50)                     afd

i want to change status column type in datagridview like textbox(message like if it is cliked show used otherwise unused)

i wrote the code in button like 

 private void button4_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = "data source=AMULYA-PC;initial catalog=barcode;integrated security=true";
            con.Open();
            SqlDataAdapter sda = new SqlDataAdapter(@"select * from  tblBarcodeTest1 ", con);
            DataSet dt = new DataSet();
            sda.Fill(dt);
            dataGridView1.DataSource = dt.Tables[0];
              
        }

 while running the program ,in datagridview status column as displayed like checkbox i want to show it like a textbox(if status is null then show unused in datagridview if not used)

in  datagridview  i want to show

status------as---- used/unused

please can anybody help me.....