System Stack Overflow Exception issue

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C#

DLL

exceptions

Function getHandle() throughs a stack overflow exception. I cannot detect any recursion. any ideas why this could happen?
Details: The dll file is available to my code. Function init(dllName)is called first to get the handle and check to see if the dll entries return true (if the address exist).

class BTS200
{
    [DllImport("GOMDBTS200.dll", EntryPoint = "GOMDBTS200_getHandle")]
    private static extern int getHandle(string device_Name, ref int _handle);

    [DllImport("GOMDBTS200.dll", EntryPoint = "GOMDBTS200_showConfig")]
    private static extern int showConfig(ref int applicationHandle, int controlBits);

    [DllImport("GOMDBTS200.dll", EntryPoint = "GOMDBTS200_getProcAddresses")]
    private static extern bool getProcAddresses(ref int p_hLibrary, string p_dllName, int p_count);



    static private bool hreleaseHandle;
    static private bool hshowConfig;
    string deviceName = "BTS200_1234";
    int handle = -1;

    public int init(string dll)
    {
        _getHandle();

        if (handle == 0)
            return 0;
        else
        {
            hreleaseHandle = getProcAddresses(ref handle, "GOMDBTS200_releaseHandle", 1);
            hshowConfig = getProcAddresses(ref handle, "GOMDBTS200_showConfig", 1);
        }
        return 0;
    }



    public int _getHandle()
    {
        getHandle(deviceName, ref handle);
        return 0;
    }

    public int _showConfig()
    {
        if (hshowConfig == true)
        {
            showConfig(ref handle, 0);
        }
        return 0;
    }

}