Large code blocks are surrounded by 3 back tick (```) characters.

public Common.Collections.FieldTemplateDetailCollection SelectFields()
{

	if (_fieldCollection == null)
	{

		// build field template object
		var ft = new Common.Components.FieldTemplate(this.Culture);
		ft.Application = Application;
		ft.TabID = TabID;
		ft.FieldTemplateID = FieldTemplateID;

		// add field collection to internal variable
		_fieldCollection = ft.SelectFields(true);

	}

	// return field collection
	return _fieldCollection;

}

You can also include code inline by surrounded text with a single back tick, for example the following markdown...

Please check your `c:\windows\` folder

Would produce the following...

Please check your c:\windows\ folder