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StringIndexOf Method (String, Int32, StringComparison)
Reports the zero-based index of the first occurrence of the specified string in the current String object. Parameters specify the starting search position in the current string and the type of search to use for the specified string.

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,
	StringComparison comparisonType
)

Parameters

value
Type: SystemString
The string to seek.
startIndex
Type: SystemInt32
The search starting position.
comparisonType
Type: SystemStringComparison
One of the enumeration values that specifies the rules for the search.

Return Value

Type: Int32
The zero-based index position of the value parameter 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.
ArgumentOutOfRangeExceptionstartIndex is less than zero or greater than the length of this string.
ArgumentExceptioncomparisonType is not a valid StringComparison value.
See Also