c# library?

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C#

Hi,
Where can i find c# libraries:

for example:

using csLibrary;

public class x
{
  // ton of these out of the box methods
  public string GetFileAsString(string fileName)
  {
    return csLibrary.GetFileAsString(fileName);
  }
}

thanks

I clarify my question:

There are a lot of things that programmers need to do repeatedly, for example, get a value from querystring, parse to a specific type, validate it and return the desired value or a default value if necessary. All of this functionality can be grouped into a method and I'm trying to find libraries with tons of these methods. In other words, a kind of extensions to the framework. I'm not searching application blocks, starter kits, etc, I'm looking for a library of methods that can help to do the boring things like extract a node or collection of nodes from an xml with a single method giving a file name and a tag element.

thanks again to respectuosily collegues.
p.s.: I'm an advanced asp.net and c# programmer, perhaps my english is a little limited.

for Christian: maybe you will say File.ReadAllText();, but if read fails, you have to catch the error, it can be encapsulated in the method instead of your code.