How to save a captured frame to project folder in ASP.Net c#?

Frames from webcam are captured and I am able to save in physical folder. But I am unable to save in project folder(folder within the project root folder)

 

System.Drawing.Image imgforms = (Bitmap)eventArgs.Frame.Clone();

imgforms.Save( ("~/images/img4.jpg"));

 

where is the problem?

please help.