Inserts a character pattern at a specified index in the string. Uses a reference value for the destination because setting it back to the original string is often forgotten and is a common source of mistakes.

public static void SetAt(
	ref string s,
	int iIndex,
	char pat
)

Public Shared Sub SetAt ( 
	ByRef s As String,
	iIndex As Integer,
	pat As Char
)

public:
static void SetAt(
	String^% s, 
	int iIndex, 
	wchar_t pat
)