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StringIndexOf Method (String, Int32, Int32)
Reports the zero-based index of the first occurrence of the specified string in this instance. The search starts at a specified character position and examines a specified number of character positions.

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

Parameters

value
Type: SystemString
The string to seek.
startIndex
Type: SystemInt32
The search starting position.
count
Type: SystemInt32
The number of character positions to examine.

Return Value

Type: Int32
The zero-based index position of value if that string is found, or -1 if it is not. If value is Empty, the return value is startIndex.
Exceptions
ExceptionCondition
ArgumentNullExceptionvalue is null.
ArgumentOutOfRangeExceptioncount or startIndex is negative.-or- startIndex is greater than the length of this string.-or-count is greater than the length of this string minus startIndex.
See Also