Breakpoint.FunctionName Property

string FunctionName { get; }

public static void FunctionName(DTE dte)
{
    // Setup debug Output window.
    Window w = (Window)dte.Windows.Item(EnvDTE.Constants.vsWindowKindOutput);
    w.Visible = true;
    OutputWindow ow = (OutputWindow)w.Object;
    OutputWindowPane owp = ow.OutputWindowPanes.Add("FunctionName property: ");
    owp.Activate();

    // dte is a reference to the DTE object passed to you by the
    // OnConnection method that you implement when you create an add-in.
    EnvDTE.Debugger debugger = (EnvDTE.Debugger)dte.Debugger;
    owp.OutputString("Breakpoint in the file " + debugger.Breakpoints.Item(1).File);
    owp.OutputString(" on line " + 
                     debugger.Breakpoints.Item(1).FileLine.ToString() + " column ");
    owp.OutputString(debugger.Breakpoints.Item(1).FileColumn.ToString() + " is ");
    owp.OutputString(debugger.Breakpoints.Item(1).Enabled ? "enabled." : "disabled.");
    owp.OutputString("\nThis breakpoint is in the function: " + 
                     debugger.Breakpoints.Item(1).FunctionName);
}