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Reports the zero-based index of the first occurrence of the specified string in this instance. The search starts at a specified character position.
Public Function IndexOf ( _
value As String, _
startIndex As Integer _
) As Integer
Type: System..::..Int32The 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 startIndex.
Index numbering starts from 0. The startIndex parameter can range from 0 to the length of the string instance. If startIndex equals the length of the string instance, the method returns -1.