Limit number of parameters per method?

Question

Assuming the parameters are all the same type, is there a rule of thumb in regards to the number of parameters for a method? Im just wondering where I should draw the line and

Answer 1

Also, for greater call-site readability, you could use a params parameter list (the varargs mentioned before), so instead of

void ConstructChildren( Node parent, IEnumerable children)
....
List children = new List {child1, child2, child3};
ConstructChildren(parent, children);

I would use

void ConstructChildren( Node parent, params Node[] children)
...
ConstructChildren( parent, child1, child2, child3);

However, the params syntax gets ugly to look at if you use more that 5-6-7 items in the children collection.