static string serverName;
MySqlCommand command;
public static string connString = @"server=" + serverName + "; Database=database; username=username; password=password";

// this is the method
public void fill_grid(string query)
try
            {

                dataGridView1.DataSource = null;
                MySqlConnection myconn = new MySqlConnection(connString);
                //myconn.Open();
                MySqlCommand mycommand = new MySqlCommand(query, myconn);
                MySqlDataAdapter myAdapter = new MySqlDataAdapter();
                myAdapter.SelectCommand = mycommand;
                DataTable dTable = new DataTable();
                myAdapter.Fill(dTable);
                dataGridView1.DataSource = dTable;
                //myconn.Close();
            }
catch (MySql.Data.MySqlClient.MySqlException ex)
            {
                MessageBox.Show(ex.Message);
            }


// this is my button
private void btnShowInfo_Click(object sender, EventArgs e)
        {
            string query = "select * from students";
            fill_grid(query);
    }

What am i doing wrong.  Thanks!