private void button1_Click(object sender, EventArgs e)
 {
     if (SQLManager.RegisterPublisher(textBox1.Text, textBox2.Text, textBox3.Text, textBox5.Text, textBox6.Text, richTextBox1.Text))
     {
         this.Close();
     }
     else
     {
         MessageBox.Show("Register failed!");
     }
 }