"A generic error occurred in GDI+ " Error for save the Image after editing

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C#

In my application ,i want to Add some dynamic text to my the Current image. So each time When i open the Form the image need to edit and display. First time when i open the Form ,all will work properly.But when i open it for 2 nd time,it won't. I checked all the privileges for the folder ,everything is fine. But still am getting the error "A generic error occurred in GDI+". Please help me to Find out the solution

using (MemoryStream ms = new MemoryStream(img))
{
    Image img1 = Image.FromStream(ms);
    Bitmap bitmap = img1 as Bitmap;
    graphics.DrawString("Dynamic Text", font, brush, atpoint, sf)
    graphics.Dispose();
    Bitmap SavingObject = new Bitmap(bitmap);
    SavingObject.Save(@path + "\\" + ImagePath,System.Drawing.Imaging.ImageFormat.Jpeg);
    bitmap.Dispose();
    img1.Dispose();
}