How to use C# string IndexOf

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The IndexOf method in string Class in C# returns the index of the first occurrence of the specified substring.

int string.IndexOf(string str)

Parameters:

str – The parameter string to check its occurrences

Returns:

Integer – If the parameter String occurred as a substring in the specified String

it returns position of the first character of the substring .

If it does not occur as a substring, -1 is returned.

Exceptions:

System.ArgumentNullException: If the Argument is null.

example:

“This is a test”.IndexOf(“Test”) returns 10

“This is a test”.IndexOf(“vb”) returns -1

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