using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

private void AddTextToImg(string fileName,string text)
{
if(!File.Exists(MapPath(fileName)))
{
throw new FileNotFoundException("The file don't exist!");
}

if( text == string.Empty )
{
return;
}
//還需要判斷文件類型是否為圖像類型，這里就不贅述了

System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName));
Bitmap bitmap = new Bitmap(image,image.Width,image.Height);
Graphics g = Graphics.FromImage(bitmap);

float fontSize = 12.0f; //字體大小
float textWidth = text.Length*fontSize; //文本的長度
//下面定義一個矩形區域，以后在這個矩形里畫上白底黑字
float rectX = 0;
float rectY = 0;
float rectWidth = text.Length*(fontSize+8);
float rectHeight = fontSize+8;
//聲明矩形域
RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);

Font font = new Font("宋體",fontSize); //定義字體
Brush whiteBrush = new SolidBrush(Color.White); //白筆刷，畫文字用
Brush blackBrush = new SolidBrush(Color.Black); //黑筆刷，畫背景用

g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);

g.DrawString(text,font,whiteBrush,textArea);
MemoryStream ms = new MemoryStream( );
//保存為Jpg類型
bitmap.Save(ms,ImageFormat.Jpeg);

//輸出處理后的圖像，這里為了演示方便，我將圖片顯示在頁面中了
Response.Clear();
Response.ContentType = "image/jpeg";
Response.BinaryWrite( ms.ToArray() );

g.Dispose();
bitmap.Dispose();
image.Dispose();
}