Datagridviewcombobox is not displaying anything

[Amit legend]

I HAVE A COLUMN CALLED QUALIFICATION IN MY DATABASE HAVING DATA BTECH,MCA.I WANT TO SHOW THAT IN COMBO BOX IN DATAGRID.HOW TO SHOW.THIS IS MY CODE

 
 
 SqlConnection con = new SqlConnection("Data Source=AMIT\\SQLEXPRESS;Initial Catalog=amit;Integrated Security=True");
SqlDataAdapter da = new SqlDataAdapter("select name,id,salary from employ ", con);
DataSet ds= new DataSet();
da.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];
textBox1.DataBindings.Add("text", ds.Tables[0], "name");
textBox2.DataBindings.Add("text", ds.Tables[0], "id");
textBox3.DataBindings.Add("text", ds.Tables[0], "salary");
 
DataGridViewComboBoxColumn car=new DataGridViewComboBoxColumn ();
 
 
car.DataSource = ds.Tables["EMPLOY"];
car.DisplayMember = "QUALIFICATION";
car.ValueMember = "id";
car.DataPropertyName = "quali";
dataGridView1.Columns.Add(car);
 
HOW to display