public static void AppendText(TextBoxBase tb, string text)
{
if (tb == null)
{
return;
}
tb.SuspendLayout();
if (tb.InvokeRequired)
{
tb.Invoke(new AppendTextDelegate(AppendText), new object[] { tb, text });
}
else
{
tb.SelectionStart = tb.TextLength;
tb.SelectedText = text;
}
tb.ResumeLayout();
}