C#-窗体之间传递参数

主窗体：

string getroomtypeid = this.dgvroomtype.Rows[e.RowIndex].Cells[0].Value.ToString();             AddRoomTypeFrm AddRoomTypeFrm = new AddRoomTypeFrm(getroomtypeid);             AddRoomTypeFrm.Show();

子窗体

public AddRoomTypeFrm(string getroomtypeid) {         InitializeComponent();         string id = getroomtypeid; }