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有时候我们在上传完一些自己的特殊图片后，想在别人转载的时候，可以表显出出自何方。这时我们就要在图片上加入一些背景字。下面给出我的代码：
前台：
<div>
<asp:Image ID="Image1" runat="server" Height="305px" Width="312px" />
<asp:FileUpload ID="FileUpload1" runat="server" Width="243px" />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="上传图片" />
</div>
后台：
protected void Button1_Click(object sender, EventArgs e)
  ...{
 string FileName;
string FileName1;
string FilePath;
FileName = this.FileUpload1.PostedFile.FileName;
FileName1 = FileName.Substring(FileName.LastIndexOf("\")+1);
FilePath = Request.PhysicalApplicationPath + "images\";
this.FileUpload1.PostedFile.SaveAs(FilePath + FileName1);
System.Drawing.Image image1 = System.Drawing.Image.FromFile(Server.MapPath("/images/" + FileName1));
System.Drawing.Image NewImage = new Bitmap(image1.Width, image1.Height, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(NewImage);
g.DrawImage(image1, 0, 0, image1.Width, image1.Height);
Font f = new Font("楷书", int.Parse("28"));
Brush b = new SolidBrush(Color.Red);
g.DrawString("IT知道网", f, b, 10, 140);
g.Dispose();
System.Drawing.Image thubimages = NewImage.GetThumbnailImage(500, 500, null,System.IntPtr.Zero);
image1.Dispose();
thubimages.Save(FilePath + FileName1, ImageFormat.Jpeg);
this.Image1.ImageUrl = "/images/" + FileName1;
 }试一下效果，你可以根据你的需求，来改变字的大小与色彩
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