Doubleclick on datagridview in C# open new from with 2 button like update and delete

See more:

C#

I am loading data from my database file to Datagrid. Doubleclick on a row in datagridview in c#, open new from with 2 button like update and delete. if I select update, which record I selected in datagrid with that one new form should open. I am not getting idea how to do that. Here is my code

loading datagrid with a database file 

con.Open();
            SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM[dbo].    [itemDB]", con);
        DataTable dt = new DataTable();
        sda.Fill(dt);

        foreach (DataRow item in dt.Rows)
        {
            int n = dataGridView1.Rows.Add();
            dataGridView1.Rows[n].Cells[0].Value = item["itmcode"].ToString();
            dataGridView1.Rows[n].Cells[1].Value = item["brname"].ToString();
            dataGridView1.Rows[n].Cells[2].Value = item["itmname"].ToString();
            dataGridView1.Rows[n].Cells[3].Value = item["itmunit"].ToString();
            dataGridView1.Rows[n].Cells[4].Value = item["itmgr"].ToString();
            dataGridView1.Rows[n].Cells[5].Value = item["itmml"].ToString();
            dataGridView1.Rows[n].Cells[6].Value = item["itmpc"].ToString();
            dataGridView1.Rows[n].Cells[7].Value = item["itmtx"].ToString();
            dataGridView1.Rows[n].Cells[8].Value = item["itmbyp"].ToString();
            dataGridView1.Rows[n].Cells[9].Value = item["itmdlrmrg"].ToString();
            dataGridView1.Rows[n].Cells[10].Value = item["itmrtmrg"].ToString();
            dataGridView1.Rows[n].Cells[11].Value = item["itmdlrp"].ToString();
            dataGridView1.Rows[n].Cells[12].Value = item["itmmrp"].ToString();
            dataGridView1.Rows[n].Cells[13].Value = item["itmusrcode"].ToString();
            dataGridView1.Rows[n].Cells[14].Value = item["active"].ToString();



        }
        con.Close();

What I have tried:

I tried this. if I double click on one row in datagrid one new form came with two buttons update and delete. If I click on update button other form also opened but data what i entered in that not updating in first form datagrid.