How to Find Out What Account ASP.NET is Running Under

You can find out what account your ASP.NET application is running under by simply executing the below code :

Response.Write(Environment.UserName)

String Format for DateTime [C#]

This example shows how to format DateTime using String.Format method. All formatting can be done also using DateTime.ToString method.

Custom DateTime Formatting

There are following custom format specifiers y (year), M (month), d (day), h (hour 12), H (hour 24), m (minute), s (second), f (second fraction), F (second fraction, trailing zeroes are trimmed),t (P.M or A.M) and z (time zone).

Following examples demonstrate how are the format specifiers rewritten to the output.

[C#]

// create date time 2008-03-09 16:05:07.123 

DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123);  

String.Format("{0:y yy yyy yyyy}", dt);  // "8 08 008 2008"   year 

String.Format("{0:M MM MMM MMMM}", dt);  // "3 03 Mar March"  month 

String.Format("{0:d dd ddd dddd}", dt);  // "9 09 Sun Sunday" day 

String.Format("{0:h hh H HH}",     dt);  // "4 04 16 16"      hour 12/24 

String.Format("{0:m mm}",          dt);  // "5 05"            minute 

String.Format("{0:s ss}",          dt);  // "7 07"            second 

String.Format("{0:f ff fff ffff}", dt);  // "1 12 123 1230"   sec.fraction 

String.Format("{0:F FF FFF FFFF}", dt);  // "1 12 123 123"    without zeroes 

String.Format("{0:t tt}",          dt);  // "P PM"            A.M. or P.M. 

String.Format("{0:z zz zzz}",      dt);  // "-6 -06 -06:00"   time zone  

You can use also date separator / (slash) and time sepatator : (colon). These characters will be rewritten to characters defined in the current DateTimeForma­tInfo.DateSepa­rator andDateTimeForma­tInfo.TimeSepa­rator.

[C#]

// date separator in german culture is "." (so "/" changes to ".") 

String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9/3/2008 16:05:07" - english (en-US) 

String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9.3.2008 16:05:07" - german (de-DE)  

Here are some examples of custom date and time formatting:

[C#]

// month/day numbers without/with leading zeroes 

String.Format("{0:M/d/yyyy}", dt);            // "3/9/2008" 

String.Format("{0:MM/dd/yyyy}", dt);          // "03/09/2008"  // day/month names 

String.Format("{0:ddd, MMM d, yyyy}", dt);    // "Sun, Mar 9, 2008" 

String.Format("{0:dddd, MMMM d, yyyy}", dt);  // "Sunday, March 9, 2008" /  

String.Format("{0:MM/dd/yy}", dt);            // "03/09/08" 

String.Format("{0:MM/dd/yyyy}", dt);          // "03/09/2008"  

Standard DateTime Formatting

In DateTimeForma­tInfo there are defined standard patterns for the current culture. For example property ShortTimePattern is string that contains value h:mm tt for en-US culture and value HH:mm for de-DE culture.

Following table shows patterns defined in DateTimeForma­tInfo and their values for en-US culture. First column contains format specifiers for the String.Format method.

Specifier	DateTimeFormatInfo property	Pattern value (for en-US culture)
t	ShortTimePattern	h:mm tt
d	ShortDatePattern	M/d/yyyy
T	LongTimePattern	h:mm:ss tt
D	LongDatePattern	dddd, MMMM dd, yyyy
f	(combination of D and t)	dddd, MMMM dd, yyyy h:mm tt
F	FullDateTimePattern	dddd, MMMM dd, yyyy h:mm:ss tt
g	(combination of d and t)	M/d/yyyy h:mm tt
G	(combination of d and T)	M/d/yyyy h:mm:ss tt
m, M	MonthDayPattern	MMMM dd
y, Y	YearMonthPattern	MMMM, yyyy
r, R	RFC1123Pattern	ddd, dd MMM yyyy HH':'mm':'ss 'GMT' (*)
s	SortableDateTi­mePattern	yyyy'-'MM'-'dd'T'HH':'mm':'ss (*)
u	UniversalSorta­bleDateTimePat­tern	yyyy'-'MM'-'dd HH':'mm':'ss'Z' (*)
		(*) = culture independent

Following examples show usage of standard format specifiers in String.Format method and the resulting output.

[C#]

String.Format("{0:t}", dt);  // "4:05 PM"                         ShortTime 

String.Format("{0:d}", dt);  // "3/9/2008"                        ShortDate 

String.Format("{0:T}", dt);  // "4:05:07 PM"                      LongTime 

String.Format("{0:D}", dt);  // "Sunday, March 09, 2008"          LongDate

String.Format("{0:f}", dt);  // "Sunday, March 09, 2008 4:05 PM"  LongDate+ShortTime 

String.Format("{0:F}", dt);  // "Sunday, March 09, 2008 4:05:07 PM" FullDateTime 

String.Format("{0:g}", dt);  // "3/9/2008 4:05 PM"             ShortDate+ShortTime 

String.Format("{0:G}", dt);  // "3/9/2008 4:05:07 PM"             ShortDate+LongTime 

String.Format("{0:m}", dt);  // "March 09"                        MonthDay 

String.Format("{0:y}", dt);  // "March, 2008"                     YearMonth 

String.Format("{0:r}", dt);  // "Sun, 09 Mar 2008 16:05:07 GMT"   RFC1123 

String.Format("{0:s}", dt);  // "2008-03-09T16:05:07"             SortableDateTime 

String.Format("{0:u}", dt);  // "2008-03-09 16:05:07Z"            UniversalSortableDateTime 

Maintain the scroll position for the web page

To maintain the scroll position for the large web page you can use on of these methods :

1- use Web.config page section <pages maintainScrollPositionOnPostBack="true" />

: this will maintains the scroll positions for all the web site pages.

2- in the page declaration <%@ Page MaintainScrollPositionOnPostback="true" %> : this will maintains the scroll position for this page only.

3- programmatically from code behindSystem.Web.UI.Page.MaintainScrollPositionOnPostBack = true; : this will maintains the scroll position for this page only (the same as page declration).

Count column in GridView

Sometime , You want to add a column to show the count of records in a gridview. It is simple,

just add a templatefield and add this in :

<ItemTemplate>

<%# Container.DataItemIndex + 1 %>

</ItemTemplate>