resize the image size and image resolution and save in to database in asp.net using c#

You will need to use the image class in the system.drawing namespace.

// Construct a bitmap from the button image resource.
Bitmap bmp1 = new Bitmap(typeof(Button), "Button.bmp");

// Save the image as a GIF.
bmp1.Save("c:\\button.gif", System.Drawing.Imaging.ImageFormat.Gif);

// Construct a new image from the GIF file.
Bitmap bmp2 = new Bitmap("c:\\button.gif");

// Draw the two images.
e.Graphics.DrawImage(bmp1, new Point(10, 10));
e.Graphics.DrawImage(bmp2, new Point(10, 40));

// Dispose of the image files.
bmp1.Dispose();
bmp2.Dispose();