IndexOf Method (String)

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Reports the zero-based index of the first occurrence of the specified string in this instance.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public int IndexOf(
	string value
)

Parameters

value
Type: System..::..String
The string to seek.

Return Value

Type: System..::..Int32
The zero-based index position of value if that string is found, or -1 if it is not. If value is String..::..Empty, the return value is 0.

ExceptionCondition
ArgumentNullException

value is nullNothingnullptrunita null reference (Nothing in Visual Basic).

Index numbering starts from zero.

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