C#

void TabControl1SelectedIndexChanged(object sender, EventArgs e)<br />
		{<br />
			if(tabControl1.TabPages.Count > 0 && !tabControl1.SelectedTab.Disposing) {<br />
				openFile = tabControl1.SelectedTab.ToolTipText;<br />
				<br />
				if(lengthSet == false) {<br />
					if(oldLength != tabControl1.SelectedTab.Controls["textEditorControl1"].Text.Length)<br />
						oldLength = tabControl1.SelectedTab.Controls["textEditorControl1"].Text.Length;<br />
						<br />
					if((bool)tabControl1.SelectedTab.Tag == true) {<br />
						saveToolStripMenuItem.Enabled = false;<br />
						toolStripButton3.Enabled = false;<br />
					}<br />
					else {<br />
						saveToolStripMenuItem.Enabled = true;<br />
						toolStripButton3.Enabled = true;<br />
					}<br />
				}<br />
			}<br />
			lengthSet = false;<br />
		}

<br />
TextEditorControl editor = (TextEditorControl)tabControl1.SelectedTab.Controls["textEditorControl1"];<br />

<br />
// This seems to work fine... it saves a reference to the BHO in an IE Property for later retrieval.<br />
HRESULT MyClass::ReferenceMe()<br />
{<br />
	BSTR bstrThisKey = SysAllocString(L"MyClass_IDisp");<br />
	VARIANT vThis;<br />
	HRESULT hr = S_OK;<br />
<br />
	if (!m_spWebBrowser)<br />
		hr = S_FALSE;<br />
	else<br />
	{<br />
		// Save this to a variant that will be referenced in IE Session<br />
		VariantInit(&vThis);<br />
		vThis.vt = VT_DISPATCH;<br />
		vThis.pdispVal = static_cast<IDispatch*>(this);<br />
<br />
		// Add our this pointer to IE session by adding a named property<br />
		if (FAILED( m_spWebBrowser->PutProperty(bstrThisKey, vThis) ))<br />
		{<br />
			hr = S_FALSE;<br />
		}<br />
	}<br />
	<br />
	VariantClear(&vThis);<br />
	SysFreeString(bstrThisKey);<br />
    return hr;<br />
<br />
}<br />
<br />
// This is the method that I want to call from the C# code<br />
// It's declared in the Public portion of the class in the .h file.<br />
void STDMETHODCALLTYPE MyClass::toggleActiveState()<br />
{<br />
	m_bActive = !m_bActive;<br />
}<br />
<br />

<br />
private void toggleBHO()<br />
{<br />
	Object pvarPBHO = null;<br />
	// Get the property from IE that was put there by the C++ code's call to "PutProperty"<br />
	// This does seem to return a COM object, which I'm assuming is my BHO reference.<br />
	pvarPBHO = Explorer.GetProperty("MyClass_IDisp");<br />
	if (pvarPBHO != null)<br />
	{			<br />
		MessageBox.Show("About to call GetType.");<br />
		// Get the object's type.  This seems to work fine.<br />
		Type typExternal = pvarPBHO.GetType();<br />
		if (typExternal != null)<br />
		{                    <br />
			// Now try to retrieve a reference ot the "toggleActiveState" method within the C++ code<br />
			MethodInfo mthInv = null;<br />
			MessageBox.Show("About to call GetMethod.");<br />
			<br />
			// AT THIS POINT THE GetMethod FUNCTION RETURNS NULL...<br />
			<br />
			// I'm not sure if I'm not calling this right, or if my prototype isn't quite right<br />
			// to allow public access to the method, or what.<br />
			mthInv = typExternal.GetMethod("toggleActiveState");<br />
			if (mthInv != null)<br />
				mthInv.Invoke(pvarPBHO, null);<br />
			else<br />
				MessageBox.Show("GetMethod returned NULL.");<br />
		}<br />
		else<br />
			MessageBox.Show("GetType returned NULL.");<br />
	}<br />
	else<br />
		MessageBox.Show("GetProperty returned NULL.");<br />
}<br />