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Add tests for StringExtensions to show how they work, example uses etc.
Could base on the following LINQPad dumps:

"hello world".IndexOfEnd("hello").Dump("IndexOfEnd hello");
"hello world".AllSortedIndexesOf(new [] { "o", "e", "l"}).Dump("AllSortedIndexes");
"hello world".CountOccurrences(Enumerable.Repeat("l", 1)).Dump("l Occurrences");
"hello world".TextAfter(" ").Dump("2nd word");
"hello world".TextBefore(" ").Dump("1st word");

"test".TextBefore("nope").Dump();
"test".TextAfter("nope").Dump();

"i.e. <ul><li>test 1</li><!-- comment --><li>text 2</li><li>testing</li></ul> - get li texts".AllTextBetween("<li>", "</li>").Dump("simple");
"i.e. <ul><li>test 1</li><!-- comment --><li>text 2</li><li>testing</li></ul> - get <li> texts".AllTextBetween("<li>", "</li>").Dump("no end 1");
"<li>test<li>blah</li>text</li>".AllTextBetween("<li>", "</li>").Dump("2 starts");
"hello;world;testing;text;test".AllTextBetween(";", ";").Dump(";");

to allow converting date formats into something more valid etc.
use when converting from string, check data type from projection matches that of column and throw an exception if not

Often, Count is used to check if the number of elements in a sequence exceeds a certain amount. But this will enumerate through all elements in a sequence in order to do so, which is unnecessary and affects performance. Therefore an extension method to solve this would be useful.

add a TimeSpan paramater to ObservableExtensions ReSubscribeOnError and DelaySubscription by that amount after an error occurs

the DataTable to SQL Insert method currently only deals with Strings. If a DataTable contains a column with a DateTime value, it should output it in the correct, unambiguous format. Same goes for Booleans, these are represented as bits in SQL.

show example of why it is useful to convert an xml file to a data table - i.e. webservice returns array of objects, useful to visualise

update readme with description of String extension methods - most of the time when doing an IndexOf, you want to get the TextBefore, TextAfter or TextBetween another IndexOf

and create extension method to convert from local timezone to UTC and vise versa

Reading an XML to DataTable can include unexpected data if there are elements between rows

The CSV methods were built for querying directly using deferred-loading, but when populating a DataTable, they are very inefficient.

some string all indexes of methods can be made parallel for better performance

Close method is not part of a finally block, meaning there are circumstances where it won't get executed when it should...

Add tests to EnumerableExtensions.CountExceeds, to prove that it does not iterate over more elements than necessary.

Example using divide by zero exception if it iterated over all elements:

var src = Enumerable.Range(1, 4).Concat(new [] { 0 });
src.Select (s => 1 / s).CountExceeds(3).Dump();