/// <summary>
  /// 반올림 함수
  /// </summary>
  /// <param name="obj">반올림하고자 하는 값</param>
  /// <param name="dgt">표시하고자 하는 소숫점 자리수</param>
  /// <returns></returns>
  public static string GetFormattedString( object obj, int dgt )
  {
   double cv = 0;
   string dumStr = string.Empty;
   int totLen = 2 + dgt;

   for( int i = 0; i < dgt; i ++ )
    dumStr += "0";

   if( obj == null )
    return "0." + dumStr;

   if( obj is string )
   {
    if(Convert.ToString(obj as string).Trim() == string.Empty )
    {
     return "0." + dumStr;
    }
    cv = double.Parse(Convert.ToString(obj as string).Trim());
   }
   else if( obj is double )
   {
    cv = (double)obj;
   }
   else if( obj is int )
   {
    cv = (int)obj;
   }
   else if ( obj is float )
   {
    cv = (float)obj;
   }

   // Gets a NumberFormatInfo associated with the en-US culture.
   System.Globalization.NumberFormatInfo nfi = new System.Globalization.CultureInfo( "en-US", false ).NumberFormat;
   // Displays the same value with four decimal digits.
   nfi.NumberDecimalDigits = dgt;

   return cv.ToString( "N", nfi );
  }