private void button1_Click(object sender, EventArgs e) { //-----Oracle ------ //con3 = new OracleConnection("Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=XE)));User Id =system; Password =system"); //con3.Open(); //string sql = "delete from extract"; //OracleCommand cmd = new OracleCommand(sql, con3); //OracleDataReader r = cmd.ExecuteReader(); //con3.Close(); //------ MySQL ------ try { MySqlConnection MyConn1 = new MySqlConnection("datasource=localhost;port=3306;username=root;password=aerospace"); string DeleteQuery = "delete from sys.sys_mon"; MySqlCommand MyCommand1 = new MySqlCommand(DeleteQuery, MyConn1); MyConn1.Open(); int n = MyCommand1.ExecuteNonQuery(); if (n >= 0) { Console.WriteLine("Data Deleted from table sys_mon. No of rows deleted = " + n); } MyConn1.Close(); } catch (Exception ex) { MessageBox.Show(ex.Message); } monitor frm = new monitor(); frm.ParentFormObject = this; // pass the parent form object frm.Show(); //this.Hide(); }