The Extension Toolkit project provides a collection of useful extension methods.
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This project is not maintained anymore.

The Extension Toolkit project provides a collection of useful extension methods for all kind of types (e.g. String class).

The Microsoft documentation is describing extension methods as follows: Extension methods enable you to add methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type. For client code written in C# and Visual Basic, there is no apparent difference between calling an extension method and the methods that are actually defined in a type.


The String.Replace extension method:

string mailTemplate = "Dear ${Name}, how are you? .... Creation date: ${CreatedOn}";


string mail = mailTemplate.Replace(new { Name = "Billy", CreatedOn = DateTime.Now });

The string variable mail will contain the following text:

//Dear Billy, how are you? .... Creation date: 01/25/2007

The String.ToNameValueCollection and NameValueCollection.Join extension method:

string prefFromDb = "ShowList=1|Type=Premium|DefaultTheme=Green";


NameValueCollection options = prefFromDb.ToNameValueCollection();


if(options["Type"](_Type_) == "Premium){




prefFromDb = options.Join();

The List.ToDataTableStructure extension method:

List<string> columns = new List<string>();

DataTable dt = columns.ToDataTableStructure();

The NameValueCollection.ToXml extension method:

NameValueCollection c = new NameValueCollection();
c.Add("Host", "");
c.Add("Port", "80");

xml = c.ToXml("Server", new { Active = "true" });

The created XML snippet will look like this:

<Server Active="true">

Help wanted

If you want to contribute to this project or have ideas for new extension methods, please feel free to contact me.