MeasureString方法测量问题！？为什么我测量出来的结果不符合，是不是用错单位了？

[Jeteam]

Font f=new Font("宋体",12);
Bitmap bm=new Bitmap(5000,5000);
Graphics gs=Graphics.FromImage(bm);
SizeF sf=new SizeF();
sf=gs.MeasureString(txtInfo,f);
Response.Write(sf.Width);

<div style="BORDER-RIGHT: #000000 1px solid; BORDER-TOP: #000000 1px solid; FONT-SIZE: 12pt; BORDER-LEFT: #000000 1px solid; WIDTH: 300px; WORD-BREAK: break-all; BORDER-BOTTOM: #000000 1px solid; FONT-FAMILY: 宋体; WORD-WRAP: break-word;width:300px;"><%#txtInfo%></div>

[Jeteam]

顶~来人帮帮忙嘛

[Jeteam]

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
来人啊~失火啦