This example calls the IndexOf method on a String object to report the index of the first occurrence of a substring.
Example
Dim SearchWithinThis As String = "ABCDEFGHIJKLMNOP"
Dim SearchForThis As String = "DEF"
Dim FirstCharacter As Integer = SearchWithinThis.IndexOf(SearchForThis)
Compiling the Code
This example requires:
- An Imports statement specifying the System namespace. For more information, see Imports Statement (.NET Namespace and Type).
Robust Programming
The IndexOf method reports the ___location of the first character of the first occurrence of the substring. The index is 0-based, which means the first character of a string has an index of 0.
If IndexOf does not find the substring, it returns -1.
The IndexOf method is case-sensitive and uses the current culture.
For optimal error control, you might want to enclose the string search in the Try block of a Try...Catch...Finally Statement (Visual Basic) construction.
See Also
Reference
Try...Catch...Finally Statement (Visual Basic)