Variable argument in C#

The params keyword can be applied on a method parameter that is an array.  When the method is invoked, the elements of the array can be supplied as a comma separated list.

So, if the method parameter is an object array,

void paramsExample(object arg1, object arg2, params object[] argsRest)
{
foreach (object arg in argsRest)
{ /* .... */ }
}

then the method can be invoked with any number of arguments of any type.
paramsExample(1, 0.0f, "a string", 0.0m, new UserDefinedType());