Refresh button - Refreshing data grid view after inserting, deleting, updating

Question

I\'m trying to create a refresh button to automatically refresh the data inside my datagridview after i have finish updating them.

However, my refresh button doesn\'

Answer 1

private void button_refresh_Click(object sender, EventArgs e)
        {
            SqlConnection con=new SqlConnection(@"");
            string query="select * from abc";
            SqlCommand cmd=new SqlCommand(query,con);
            SqlDataAdapter da=new SqlDataadapter(cmd);
            DataTable dt=new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource=dt;
        }