public void ReplaceWith( string imageFile )
Public Sub ReplaceWith ( imageFile As String )
This method replaces all occurrences of the image within the document. If the original image was used on several pages, then the new image will be used in the same places of the same pages.
The file should contain a complete image encoded with one of the supported image compression schemes. This method won't work with only raster bytes or any other partial contents.
Replacing an image can cause unexpected and/or unpleasant visual results. For example, image masking effects can be broken if you replace a mask image or an image that has a mask. Usually, it is undesirable to replace an image with a new image that has very different size and/or proportions.