0x800a139e - Microsoft JScript runtime error: ASP.NET Ajax client-side framework failed to load.

You may encounter this error in MVC applications.
Ajax libraries are rendered to the client side as axd file requests, in turn it actually returns javascript files.
MVC url routing blocks axd files by default.
To avoid this you can add the following line in Application_Start method Global.asax.cs/vb
CS

RouteTable.Routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

VB

RouteTable.Routes.IgnoreRoute("{resource}.axd/{*pathInfo}")

Standard Date Time Formatting

Date values can be formatted to particular format using ToString method

 

Example

var str = dt.ToString(“o”)

 

Format Code	Sample output	Format Name
d	10-08-2012	Short Date
f	10 August 2012 14:20	Full Date Time Short
g	10-08-2012 14:20	General Short
m	10 August	Day Month Pattern
o	2012-08-10T14:20:30.1230000	Round trip date time
r	Fri, 10 Aug 2012 14:20:30 GMT	RFC1123
s	2012-08-10T14:20:30	Sortable date time
t	14:20	Short time
u	2012-08-10 14:20:30Z	Universal sortable
y	August, 2012	Month Year
D	10 August 2012	Long Date
F	10 August 2012 14:20:30	Full Date Time Long
G	10-08-2012 14:20:30	General Long
M	10 August	Day Month Pattern
O	2012-08-10T14:20:30.1230000	Round trip date time
R	Fri, 10 Aug 2012 14:20:30 GMT	RFC1123
T	14:20:30	Long Time
U	10 August 2012 08:50:30	Universal sortable
Y	August, 2012	Month Year

Extension method must be defined in a non-generic static class

Extension methods (with this keyword in the first parameter), should be containing only within the class is Non Generic and Static.

Containing class

Should Not be generic class

Should be defined as static