在winForm窗体好像messagebox一样返回信息

主窗体  

Form4 f4 = new Form4()
              DialogResult dr = f4.ShowDialog();
                if (dr==DialogResult.OK)
                {

                }

副窗体

        private void button1_Click(object sender, EventArgs e)//确定按钮
        {
           this.DialogResult = DialogResult.OK; 
             this.Close(); 

        }

        private void button2_Click(object sender, EventArgs e)//取消按钮
        {
           this.DialogResult = DialogResult.Cancel; 
           this.Close(); 

        }