The Weird and The Wonderful

' Grasshopper, take a deep breath ...
err2go = "    sErrDescr = ""Error "" & Err.Number & "" '"" & Err.Description & ""'"" & vbCrLf &_
         "" occurred in " & fileName & " " & gErlRoutine & """ & _" & vbCrLf & _
         "    IIf(Erl <> 0, "" at line "" & cstr(Erl) & ""."", ""."")"
Print #fOut, err2go
' ... now exhale

switch (e.KeyCode)
{
    case Keys.D1:
        if (keyIsDown[Keys.D1]) return;

        try
        {
            keyIsDown[Keys.D1] = true;
            // code continues. ..
        }
        catch { }
    break;
}

/// <summary>
/// Gets whether the Type <paramref name="t"/> implements the interface <paramref name="interfaceType"/>.
/// </summary>
/// <param name="t">The type to check.</param>
/// <param name="interfaceType">The type of the interface.</param>
/// <returns><c>True</c> if <paramref name="t"/> implements the interface, <c>false</c> otherwise.</returns>
public static bool Implements(this Type t, Type interfaceType)
{
    return t.GetInterfaces().Contains(interfaceType);
}

/// <summary>
/// Gets whether the Type <paramref name="t"/> implements the interface specified by <typeparamref name="TInterface"/>.
/// </summary>
/// <typeparam name="TInterface">The type of the interface to check for.</typeparam>
/// <param name="t">The type to check.</param>
/// <returns><c>True</c> if <paramref name="t"/> implements the interface, <c>false</c> otherwise.</returns>
public static bool Implements<TInterface>(this Type t)
{
    return t.Implements(typeof(TInterface));
}

SqlConnection 

string rtf1 = richTextBox1.Rtf;
richTextBox1.SelectAll();
string rtf2 = richTextBox1.SelectedRtf;
System.Diagnostics.Debug.Assert(rtf1 == rtf2);