SQLFreeHandle

C# Signature:

[DllImport("odbc32.dll", CharSet = CharSet.Unicode)]
static extern short SQLFreeHandle(ushort HandleType, IntPtr InputHandle);

VB Signature:

Declare Function SQLFreeHandle Lib "odbc32.dll" (ByVal HandleType As Short, ByVal InputHandle As IntPtr) As Short

Notes:

public const ushort SQL_HANDLE_ENV = 1;
public const ushort SQL_HANDLE_DBC = 2;
public const ushort SQL_HANDLE_STMT = 3;
public const ushort SQL_HANDLE_DESC = 4;