var
YESNO:dialogresult;(出現錯誤:constant or type identifier expected)
     YESNO:=
     MessageBox.Show('無此使用者,是否重新輸入？','Message Box',MessageBoxButtons.YesNo,MessageBoxIcon.Question,MessageBoxDefaultButton.Button1);
     if YESNO = self.DialogResult.Yes then
     begin
     self.TextBox1.Focus:=true;
     end;

            string message = "You did not enter a server name. Cancel this operation?";
            string caption = "No Server Name Specified";
            MessageBoxButtons buttons = MessageBoxButtons.YesNo;
            DialogResult result;                // Displays the MessageBox.                result = MessageBox.Show(this, message, caption, buttons);                if(result == DialogResult.Yes) //if (MessageBox.Show(this, message, caption, buttons)==DialogResult.Yes)
            {                    // Closes the parent form.                    this.Close();                }

引言: DialogResult result; 他是將result 宣告為DialogResult var YESNO:dialogresult;(出現錯誤:constant or type identifier expected) 可是我不能宣告 還是我的格式錯誤?

if MessageBox.Show('are you sure?','Confirm',MessageBoxButtons.YesNo) = System.Windows.Forms.DialogResult.Yes then
  begin
     Button1.Text := '1234';
  end;