Multiple Using Statements

Using statements are used to define a scope on an object that implements the iDisposable interface.  It automatically calls the Dispose method on the object when it goes out of scope.

Here's a neat little trick to deal with nested using statements.  Consider the following code snippet that has a couple of them:

using (FileStream fs = File.Create("File.txt"))
{
    using (TextWriter tw = new StreamWriter(fs))
    {
        tw.WriteLine("The content of my file!");
    }
}

Here's a cleaner, and in my opinion easier, way to write these.  Notice that the FileStream object is useable when creating the TextWriter object.

using (FileStream fs = File.Create("File.txt"))
using (TextWriter tw = new StreamWriter(fs))
{
    tw.WriteLine("The content of my file!");
}

If you are instantiating multiple objects of the same type, you could put them all on one line.  It is harder to read this way, but maybe that's just me. ;)

using (StreamWriter tw1 = File.CreateText("W1"), tw2 = File.CreateText("W2"))
{
        tw1.WriteLine("The content of my first file!");
        tw2.WriteLine("The content of my second file!");
}