attribute1.cs

public class MyAttribute : Attribute
{
    public MyAttribute(string something) { }    
    public MyAttribute(string[] something) { }
}

public class AttributeUsage
{
    [MyAttribute("this works")]
    public void Method1() {}

    [MyAttribute(new [] { "this", "also", "works"})]
    public void Method2() {}

    static string _thisDoesnt = "this doesnt";
    [MyAttribute(_thisDoesnt)]
    public void Method3() {}
}

attribute2.cs

public class MyAttributeWithType1<T> : Attribute        // the compile error occurs here
{
    public MyAttributeWithType1() {}
}

public class MyAttributeWithType2 : Attribute
{
    public MyAttributeWithType2(Type t) {}
}

public class AttributeWithTypeUsage
{
    [MyAttributeWithType1<DateTime>]
    public void Method1() { }

    [MyAttributeWithType2(typeof(DateTime))]
    public void Method2() { }
}

attributereflection.cs

// get all the attributes used on MyClass
System.Reflection.MemberInfo info = typeof(MyClass);
object[] attributes = info.GetCustomAttributes(true);

httppostexample.cs

public class MyController : Controller
{
    [HttpPost]
    public ActionFilter ActionOnlyForPostRequests()
    {
        // action method body...
    }
}