C#滚动字幕的实现方法

private  Label label = new Label(); 
public string text="csdn baihe_591";  

private void FrmShow_Load(object sender, EventArgs e) 
{           
this.label.Location = new Point(149, 13); 
this.label.Size = new Size(134, 16); 
this.Controls.Add (label);          
this.label.Text = ""; 
this.timer1.Enabled = true; 
this.timer1.Interval = 500;  
p = new PointF(this.label.Size.Width, 0); 
}    

PointF p; 
Font f = new Font("宋体", 10); 
Color c = Color.White; 
string temp; 
private void timer1_Tick(object sender, EventArgs e) 
{ 

Graphics g = this.label.CreateGraphics(); 
SizeF s = new SizeF(); 
s = g.MeasureString(text, f);//测量文字长度 
Brush brush = Brushes.Black;            
g.Clear(c);//清除背景 

if (temp != text)//文字改变时,重新显示 
{ 
p = new PointF(this.label.Size.Width, 0); 
temp = text; 
} 
else 
p = new PointF(p.X - 10, 0);//每次偏移10 
if (p.X <= -s.Width) 
p = new PointF(this.label.Size.Width, 0); 
g.DrawString(text, f, brush, p);   
}