Gridview binding works in Single Form Application but not working in MDI Form

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Gridview

data-binding

I have a gridview in my MDI Application which displays the list of customers and the columns are defined at the design time.

My code for binding the grid in Form_Load() is:

private void SearchForm_Load(object sender, EventArgs e)
        {

            dataGridView1.AutoGenerateColumns = false;

            try
            {

                cn = db.createConnection();

                if (cn.State == System.Data.ConnectionState.Open)
                    cn.Close();


                cn.Open();
                cmd = new OleDbCommand("Select BillNo,PartyName,City,State,FORMAT(BillDt,'dd-mm-yyyy')as BillDt from BillMaster", cn);
                da = new OleDbDataAdapter(cmd);
                ds = new DataSet();
                da.Fill(ds);
                cn.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());

            }
            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.DataSource = ds.Tables[0];
            

            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                dataGridView1.Rows[i].Cells[0].Value = ds.Tables[0].Rows[i]["BillNo"].ToString();
                dataGridView1.Rows[i].Cells[1].Value = ds.Tables[0].Rows[i]["PartyName"].ToString();
                dataGridView1.Rows[i].Cells[2].Value = ds.Tables[0].Rows[i]["City"].ToString();
                dataGridView1.Rows[i].Cells[3].Value = ds.Tables[0].Rows[i]["State"].ToString();
                dataGridView1.Rows[i].Cells[4].Value = ds.Tables[0].Rows[i]["BillDt"].ToString();
            }


            

            ds.Dispose();
            cmd.Dispose();
            da.Dispose();
            cn.Close();

The data is assigned to the each cell of grid but not displayed in the form when it is loaded.

I tried the same code in the Single form application and it works perfectly.

what should I do ? Please help. Thanks in advance.