string .join

                    DateTime dt = Convert.ToDateTime(Model.xx);
                    string format = "yyyy/MM/dd";
                    string bb= "(" + dt.ToString(format) + ")";
                    string[] cc= {aa, bb};
                    string newJoin = string.Join("", cc);
                 

string convert to DateTime C# 兩種做法

string xx= Model.xx;
DateTime dt = Convert.ToDateTime(xx);
     
string format = "yyyy/MM/dd";
(<%=dt.ToString(format)%>)

FundSizeDate = string.Format("{0}/{1}/{2}", dt.Year, dt.Month, dt.Day);
(<%=String.Format("{0:yyyy/MM/dd}", xx)%>

亂數不重複加排序

 <%
     ArrayList myArray = new ArrayList();
     int number;
     System.Random num = new Random();
     for (int i = 0; i < 30; i++)
     {
         do
         {
             number = num.Next(1, 50);
         } while (myArray.IndexOf(number.ToString()) != -1);
         myArray.Add(number.ToString());
     }
     var sortedmyArray = myArray.Cast<string>().OrderBy(item => int.Parse(item));
     foreach (var a in  sortedmyArray)
     {
         Response.Write("<LI>" + a);
     }
%>

C# Server驗證~!!

public class ServerValidation
    {
        public struct RegularExp
        {
            public const string Chinese = @"^[^\u4E00-\u9FA5]$";
            public const string Chinese1 = @"^[\u4E00-\u9FA5\uF900-\uFA2D]+$";
            public const string Color = "^#[a-fA-F0-9]{6}";
            public const string Date = @"^((((1[6-9]|[2-9]\d)\d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]\d|3[01]))|(((1[6-9]|[2-9]\d)\d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]\d|30))|(((1[6-9]|[2-9]\d)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|(((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))-0?2-29-))$";
            public const string DateTime = @"^((((1[6-9]|[2-9]\d)\d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]\d|3[01]))|(((1[6-9]|[2-9]\d)\d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]\d|30))|(((1[6-9]|[2-9]\d)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|(((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))-0?2-29-)) (20|21|22|23|[0-1]?\d):[0-5]?\d:[0-5]?\d$";
            public const string Email = @"^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$";
            public const string Float = @"^(-?\d+)(\.\d+)?$";
            public const string ImageFormat = @"\.(?i:jpg|bmp|gif|ico|pcx|jpeg|tif|png|raw|tga)$";
            public const string Integer = @"^-?\d+$";
            public const string IP = @"^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$";
            public const string Letter = "^[A-Za-z]+$";
            public const string LowerLetter = "^[a-z]+$";
            public const string MinusFloat = @"^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$";
            public const string MinusInteger = "^-[0-9]*[1-9][0-9]*$";
            public const string Mobile = "^0{0,1}13[0-9]{9}$";
            public const string NumbericOrLetterOrChinese = @"^[A-Za-z0-9\u4E00-\u9FA5\uF900-\uFA2D]+$";
            public const string Numeric = "^[0-9]+$";
            public const string NumericOrLetter = "^[A-Za-z0-9]+$";
            public const string NumericOrLetterOrUnderline = @"^\w+$";
            public const string PlusFloat = @"^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$";
            public const string PlusInteger = "^[0-9]*[1-9][0-9]*$";
            public const string Telephone = @"(\d+-)?(\d{4}-?\d{7}|\d{3}-?\d{8}|^\d{7,8})(-\d+)?";
            public const string UnMinusFloat = @"^\d+(\.\d+)?$";
            public const string UnMinusInteger = @"\d+$";
            public const string UnPlusFloat = @"^((-\d+(\.\d+)?)|(0+(\.0+)?))$";
            public const string UnPlusInteger = @"^((-\d+)|(0+))$";
            public const string UpperLetter = "^[A-Z]+$";
            public const string Url = @"^http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&amp;=]*)?$";
            public const string Guid = @"^(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}$";
        }
           
        private static Regex isGuid = new Regex(RegularExp.Guid, RegexOptions.Compiled);
        private static Regex isChinese = new Regex(RegularExp.Chinese, RegexOptions.Compiled);
        private static Regex isMobile = new Regex(RegularExp.Mobile, RegexOptions.Compiled);

        public bool IsGuidValid(string candidate, out Guid marketcontent)
            {
                marketcontent = Guid.Empty;    
                try
                {
                        if (isGuid.IsMatch(candidate))
                        {
                            marketcontent = new Guid(candidate);
                            return true;
                        }
                        return false;
                }
                catch(ArgumentException)
                {
                        return false;
                }
            }

        public bool IsChineseValid(string chinese)
        {      
            try
            {
                    if(isChinese.IsMatch(chinese))
                    return true;
       
                    return false;
            }
            catch(FormatException)
            {
                    return false;
            }
        }

        public bool IsMobileValid(string number)
        {
            try
            {
                if(isMobile.IsMatch(number))
                return true;

                return false;
            }
            catch (FormatException)
            {
                return false;
            }
        }

        public bool IsEmailValid(string emailaddress)
        {
            try
            {
                MailAddress m = new MailAddress(emailaddress);
                return true;
            }
            catch (FormatException)
            {
                return false;
            }
        }
    }

(int?)null

d.Cl_Id = Convert.ToInt32(cl_id) == 0 ? (int?)null : Convert.ToInt32(cl_id);
int? abc = (def == "noval" ? (int?)null : Convert.ToInt32(def ));

C# 程式設計手冊

http://msdn.microsoft.com/zh-tw/library/67ef8sbd(v=vs.80).aspx

Linq Group By

itemList = (from a in xxxxxx
group a by new { a.xxxx, a.xxxx} into g
select new xxxxx
{
Counter = g.Sum(x => x.Counter),
xxx= g.Key.xxxxx,
Unit = g.Key.UnitType
}
).ToList();

取網頁中的原始碼轉成字串

int timeoutSeconds = 1;

// 設定request
System.Net.WebRequest request = System.Net.WebRequest.Create(URL);

//設定TimeOut的時間(怕網路速度過慢，資料不完全)
request.Timeout = timeoutSeconds * 1000;

// 從request接收資料
System.Net.WebResponse response = request.GetResponse(); System.IO.Stream streamReceive = response.GetResponseStream(); System.Text.Encoding encoding = System.Text.Encoding.GetEncoding("utf-8"); System.IO.StreamReader streamRead = new System.IO.StreamReader(streamReceive, System.Text.Encoding.Default);

// 取得原始碼
String HTML = streamRead.ReadToEnd();

字串 (C# 程式設計手冊)

http://msdn.microsoft.com/zh-tw/library/ms228362.aspx