Ye soal c# about MessageBoxButtons.YesNo

Salam
man toye formam code nvshtam be in sharh :
messagebox.Show("aya motmenid k mikhahid vard narm afzar shavid","mehran",messageboxbuttons.Yes no
ta injasho balad bodam
hala che codi bayad benvisam
ke age user yes click kone
narm afzar baz bsh ke bedn cod inkar anjam mishe
qesmat mhm ine k che codi bnvisam k ba click roye no vard narm afzar nashe
lotfan javb bdn

Ye dastor sharti ]IF] bezar ke age messageboxbutton=Select.Yes shud
form=show
beshe.

Haminkaro kardam ama cod eror mide
lotfan codo kamel bgo o tozi bde

Codi k man vard kardam :
if(messageboxbuttons=select.Yes)
this.Show;

moshkele cod kojast lotfan javab bede

Lotfan yeki javab bede

Code:

DialogResult Result = MessageBox.Show("mikhay vared shi?", "frb", MessageBoxButtons.YesNo,MessageBoxIcon.Question);
            if (Result == Result.Yes)
            {
                this.Show();
            }
            else if (Result == DialogResult.No)
            {
                Application.Exit();// or this.Close();
            }

or

Code:

  DialogResult Result = MessageBox.Show("mikhay vared shi?", "frb", MessageBoxButtons.YesNo,MessageBoxIcon.Question);
          switch (Result)
          {
              case DialogResult.Yes:
              this.Show();
              break;
              case DialogResult.No:
              Application.Exit();// or this.Close();
              break;
            }