c# - 在文本框中显示来自查询的数据

Question

这是我想要选择 max(pid) 并希望将其显示到文本框中的整个代码

public PatientRegistration()
    {
        InitializeComponent();
        string connectionstring = "DATABASE=hmanagmentsystem;UID=root;PASSWORD=;SERVER=localhost";
        con = new MySqlConnection(connectionstring);
        con.Open();
    }

  private void PatientRegistration_Load(object sender, EventArgs e)
    {

        MySqlCommand command = new MySqlCommand("select max(pid) from patientreg",con);
        txtpatientid.Text = command.ToString();
        con.Close();

    }

Answer 1

txtpatientid.Text = command.ExecuteScalar().ToString();