void kayitdelete()
        {

            string Query = "delete from users where username='" + this.textBox1.Text + "';";

            try
            {
             
                MySqlCommand MyCommand2 = new MySqlCommand(Query, connect);
                MySqlDataReader MyReader2;
                connect.Open();
                MyReader2 = MyCommand2.ExecuteReader();
                MessageBox.Show("Data Deleted");
                while (MyReader2.Read())
                {
                }
                connect.Close();
            }
           
           
        
            catch (Exception ex)  
            {  
                MessageBox.Show(ex.Message);  
            }
        }  



SİLME




GÜNCELLEME



string name = textBox1.Text;
            string pass = textBox2.Text;
            string update = "Update users set username='"+name+"',upassword='"+pass+"'";
            MySqlCommand mycom = new MySqlCommand(update, connect);
            MySqlDataAdapter adap = new MySqlDataAdapter(update, connect);
            connect.Open();
            MySqlDataReader mydr;
            mydr = mycom.ExecuteReader();
            mydr.Read();
            connect.Close();








DATA GRİDVİEW

      MySqlCommand komut = new MySqlCommand("SELECT * from users", connect);
            MySqlDataAdapter da = new MySqlDataAdapter(komut);

            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;
            connect.Close();
            string veri1 = textBox1.Text;
            string veri2 = textBox2.Text;
            textBox1.Text = veri1;
            textBox2.Text = veri2;