Using members of Var type

Yes, absolute - because var isn't actually a type. It just tells the compiler: "I'm not going to explicitly tell you the type - just use the compile-time type of the right-hand operand of the assignment operator to work out what type the variable is."

So for example:

var text = "this is a string";
Console.WriteLine(text.Length); // Uses string.Length property

As well as being convenient, var was introduced to enable anonymous types, where you couldn't declare the variable type explicitly. For example:

// The type involved has no name that we can refer to, so we *have* to use var.
var item = new { Name = "Jon", Hobby = "Stack Overflow" };
Console.WriteLine(item.Name); // This is still resolved at compile-time.

Compare this with dynamic, where the compiler basically defers any use of members until execution-time, to bind them based on the execution-time type:

dynamic foo = "this is a string";
Console.WriteLine(foo.Length); // Resolves to string.Length at execution time

foo = new int[10]; // This wouldn't be valid with var; an int[] isn't a string
Console.WriteLine(foo.Length); // Resolves to int[].Length at execution time

foo.ThisWillGoBang(); // Compiles, but will throw an exception