Convert ArrayList to String (C#, VB.NET)

A function (with overloads, for char or string deliminator) for converting an ArrayList to a string (with defined deliminator). When calling with ArrayListToString(MyArrayList), default deliminator is ,.

C#

public string ArrayListToString(System.Collections.ArrayList ar)
{
 return ArrayListToString(ar, ',');
}
public string ArrayListToString(System.Collections.ArrayList ar, char delim)
{
 return ArrayListToString(ar, delim.ToString());
}
public string ArrayListToString(System.Collections.ArrayList ar, string delim)
{
 return string.Join(delim, (string []) ar.ToArray(typeof(string)));
}

VB.NET

Public Overloads Function ArrayListToString(ByVal ar As System.Collections.ArrayList) As String
 Return ArrayListToString(ar, ","C)
End Function

Public Overloads Function ArrayListToString(ByVal ar As System.Collections.ArrayList, ByVal delim As Char) As String
 Return ArrayListToString(ar, delim.ToString)
End Function

Public Overloads Function ArrayListToString(ByVal ar As System.Collections.ArrayList, ByVal delim As String) As String
 Return String.Join(delim, CType(ar.ToArray(GetType(String)), String()))
End Function