C# WinApp สอบถามเรื่อง DateTimePicker เราสามารถกำหนดให้ค่าเป็น en-US th-TH ได้ไม๊ครับ

       Dim ThaiCultureInfo As CultureInfo = System.Globalization.CultureInfo.GetCultureInfo("th-TH")
        DateTimePicker1.Format = DateTimePickerFormat.Custom
        Dim formats As String() = DateTimePicker1.Value.GetDateTimeFormats(ThaiCultureInfo)
        DateTimePicker1.CustomFormat = formats(9)

System.Globalization.CultureInfo cultureInfo = new System.Globalization.CultureInfo("en-US");
 System.Threading.Thread.CurrentThread.CurrentCulture = cultureInfo;
 System.Threading.Thread.CurrentThread.CurrentUICulture = cultureInfo;

public class DatetimeRegionInfo:System.Windows.Forms.DateTimePicker
    {
       public enum CultureName
       {
           Thailand, EngishUS, Spanish, Chinese, Japanese, Korean, German, Hungarian, Georgian
       }
       private CultureName _CultureName;
        [System.ComponentModel.Browsable(true)]
        [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Always)]
        [System.ComponentModel.Category("Behavior")]
        [System.ComponentModel.Description("Select Region format of datetime")]
       public CultureName cultureName
       {
           get { return _CultureName; }
           set
           {
               _CultureName = value;
           }
       }

        protected override void OnValueChanged(EventArgs eventargs)
        {
            base.OnValueChanged(eventargs);
            string strCultureName = "";
            switch (_CultureName)
            {
                case CultureName.Chinese:
                    strCultureName = "zh-CN";break;
                case CultureName.EngishUS:
                    strCultureName = "en-US";break;
                case CultureName.Georgian:
                    strCultureName = "ka-GE";break;
                case CultureName.German:
                    strCultureName = "de-DE";break;
                case CultureName.Hungarian:
                    strCultureName = "hu-HU";break;
                case CultureName.Japanese:
                    strCultureName = "ja-JP";break;
                case CultureName.Korean:
                    strCultureName = "ko-KR";break;
                case CultureName.Spanish:
                    strCultureName = "es-ES";break;
                case CultureName.Thailand:
                    strCultureName = "th-TH";break;

            }
            // งง ว่าจะให้แปลงเป็น string แล้ว แปลงกลับเป็น DateTime อีกเพื่อ ?
            CultureInfo ci  = new CultureInfo(strCultureName);
            DateTimeFormatInfo info = ci.DateTimeFormat;
            base.Format = System.Windows.Forms.DateTimePickerFormat.Custom;
            base.CustomFormat = base.Value.GetDateTimeFormats(ci)[9];
            base.Value = DateTime.Parse(base.Value.ToString());
        }

    }