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ArrayListIndexOf Method (Object, Int32, Int32)
Searches for the specified Object and returns the zero-based index of the first occurrence within the range of elements in the ArrayList that starts at the specified index and contains the specified number of elements.

Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0
Syntax
C#
Copy
public virtual int IndexOf(
	Object value,
	int startIndex,
	int count
)

Parameters

value
Type: SystemObject
The Object to locate in the ArrayList. The value can be null.
startIndex
Type: SystemInt32
The zero-based starting index of the search. 0 (zero) is valid in an empty list.
count
Type: SystemInt32
The number of elements in the section to search.

Return Value

Type: Int32
The zero-based index of the first occurrence of value within the range of elements in the ArrayList that starts at startIndex and contains count number of elements, if found; otherwise, -1.
Exceptions
ExceptionCondition
ArgumentOutOfRangeExceptionstartIndex is outside the range of valid indexes for the ArrayList.-or- count is less than zero.-or- startIndex and count do not specify a valid section in the ArrayList.
See Also