Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the entire List<(Of <(<'T>)>)>.

Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the range of elements in the List<(Of <(<'T>)>)> that extends from the specified index to the last element.

Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the range of elements in the List<(Of <(<'T>)>)> that starts at the specified index and contains the specified number of elements.