add dynamically datagridviewcombobox in datagridview

i want to add dynamically combobox in datagridview on particular gride cell in window form

from two diff datatable now in getting problem " Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound."

code : window form application

string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

using (SqlConnection con = new SqlConnection(cs))

{

SqlDataAdapter ad = new SqlDataAdapter("select * from test;select * from dis", con);

con.Open();

DataSet ds = new DataSet();

ad.Fill(ds);

DataTable dt = ds.Tables[0];

DataTable dt1 = ds.Tables[1];

for (int i = 0; i <= dt.Rows.Count - 1; i++)

{

for (int j = 0; j <= dt.Columns.Count - 1; j++)

{

//string conl = Convert.ToString(dt.Columns[j]);

// dataGridView1.Columns.Add(conl, conl);

DataGridViewComboBoxColumn com = new DataGridViewComboBoxColumn();

// ComboBox com = new ComboBox();

com.DataSource = dt1;

com.ValueMember = "Id";

com.DisplayMember = "displayname";

DataRow dr = dt.NewRow();

// com.SelectedValue = dt.Rows[i][j].ToString();

string p = dt1.Rows[i][j].ToString();

//dataGridView1.Columns[j].Width = 80;

dataGridView1.DataSource = dt;

if (p == "101")

{

string list = p.CompareTo("101").ToString();

string list1 = p.CompareTo("102").ToString();

com.DataSource = null;

com.Items.Clear();

com.Items.Add(list);

}

dataGridView1.Rows.Add(dr);

}