JavaScript - Sum of the first X prime numbers

I recently had a programming challenge where I had to find the sum of the first X prime numbers in JavaScript in a slightly compressed format, and couldn't find anything decent online.

So I coded this.


It could be far better, although the challenge was timed :P

Thanks to The Polyglot Developer for their "isPrime" function :)

A Textbox that only allows numbers

Since this seems so hard to do... An actual working example :)

Usage HTML: <input type="text" onkeypress="return isNumericKeyPress(event.keyCode);" onpaste="isNumericPaste(this);" />

OR

ASP.NET: <asp:textbox ID="txtNumsOnly" runat="server" onkeypress="return isNumericKeyPress(event.keyCode);" onpaste="isNumericPaste(this);"></asp:textbox>

Demo Type or paste something:

Samples
- 1!2@3#
- Test
- Test1
- 1a2b3c

C# - Finding the Median value of a List

I love using Lists in C#. Unfortunately, the List class lacks some functionality - Like finding the median value in a set.

Definition: The median is the value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. In simple terms, it may be thought of as the "middle" value of a data set. For example, in the data set {1, 3, 3, 6, 7, 8, 9}, the median is 6, the fourth number in the sample. The median is a commonly used measure of the properties of a data set in statistics and probability theory.

Examples:

1.) If there is an odd number of numbers, the middle one is picked. For example, consider the set of numbers:

1, 3, 3, 6, 7, 8, 9

This set contains seven numbers. The median is the fourth of them, which is 6.

2.) In the data set:

1, 2, 3, 4, 5, 6, 8, 9

The median is the mean of the middle two numbers: this is (4 + 5) ÷ 2, which is 4.5.
- Median on Wikipedia

So - Here's some code to do it :)

ASP.NET - Fixing Entity Framework Migration Errors

AKA

"The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information."

OR

"Exception Details: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information."

 

Whilst doing migrations from EF4 to EF6, I came across the following error. This is caused by two different things

1.) Your project contains both EF4 and EF6 references. If you're using EF6, only EF6 can be in the project. Either remove everything EF4 related, or upgrade it to EF6.

2.) You're missing a DLL. This seems to be the most common error. Navigate to applicationPath\bin\ on the server, and look for EntityFramework.SqlServer.dll (Should be around 600KB). For some odd reason, it rarely gets included in deployments. If it's not there, simply copy the version from your development machine onto the server, and you're good to go!