Its fine working.Thanks.I have one more doubt regarding watermark text size.I have same size images.In one image,watermark text is large font.In another one image small font size.I want watermark text as standard format,size and also according to image size.
below code for text size.
SizeF textSize = graphic.MeasureString(watermark, myFont);

int x =100;
int y= 100;
PointF pointF = new PointF(x, y);
graphic.DrawString(watermark, myFont, brush, pointF);
x += Convert.ToInt32(textSize.Width);
y += Convert.ToInt32(textSize.Height);

If u want please verify my earlier attachment.

You need to set the font size depending on the size of the image. Now how long is your watermark, and how far across the image do you want it to be? In my example, it is set at 70% of the image's size. So if this was my images' size: Therefore, if you wish your watermark to be 70% of the picture width, you need to divide your pictures width by the ratio.

Look at my earlier example. It is always set to 75% of the picture. So if the picture is 6000 pixels in width, my text will always take up 4500 pixels. If it is only 100 pixels in width, it will take up 75 pixels.

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Watermark text size related to image resolution.If image resolution is 100 means text size is small if it is >300 text size too large.can we change the image resolution at the upload time. or can we set text doesnt relate with resolution.

It should relate to the resolution, it should relate to the width of the image.

Oh I see what you're saying. Yes you can set it to a certain size period. Keep this in mind though that if the picture is small, your watermark may "run off" the picture. Instead of setting the watermark text to a resized font size, just set the font size!

Without text size problem Its working good in local.If i upload files it doesnt work in site.I think problem in specifying the image path that is

Image image = Image.FromFile(context.Request.PhysicalPath);

what is the exact path specification instead of this.

I didnt set watermark text to a resized font size,I just set the font size!

Font myFont = new Font("Arial", 18);
SolidBrush brush = new SolidBrush(Color.FromArgb(80, Color.White));
At run time it takes like that.

can I see the graphics? Take a screen shot of a smaller one and a larger one so I see the scope of your problem. Thanks.

The first image(bird) has a resolution 300.second one 100.I think In that class there is no relation between text size and resolution.