窗体最大化（包含任务栏）：
1 this.TopMost = true;
2 this.Location = new Point(0, 0);
3 this.Size = Screen.PrimaryScreen.Bounds.Size;
窗体最大化（不包含任务栏）：
1 this.Location = new Point(0, 0);
2 this.Size = Screen.PrimaryScreen.WorkingArea.Size;
textbox滚动到最下端：
1 textBox.SelectionStart = textBox.TextLength - 1;
2 textBox.ScrollToCaret();
原文：http://www.cnblogs.com/imstrive/p/5779063.html