Inserting Picture Into Database

I am inserting a picture into a database, using the following code.

strFileType = Path.GetExtension(filImage.PostedFile.FileName).ToLower();
switch (strFileType)
{
case ".gif":
strMimeType = "image/gif";
break;
case ".jpg":
case ".jpeg":
case ".jpe":
strMimeType = "image/jpeg";
break;
case ".png":
strMimeType = "image/png";
break;
}
//Store the content length
int iDocLength = filImage.PostedFile.ContentLength;
byte[] bDocBuffer = new byte[iDocLength];
//Get stream object
Stream streamImage;
streamImage = filImage.PostedFile.InputStream;
streamImage.Read(bDocBuffer, 0, iDocLength);
cmPerson.CommandText = "INSERT INTO photos VALUES(@referenceid, @image, @imgtype)";
cmPatient.Parameters.AddWithValue("@referenceid", iPersonID.ToString("000000"));
cmPerson.Parameters.AddWithValue("@image", bDocBuffer);
cmPerson.Parameters.AddWithValue("@imgtype", strMimeType);
cmPerson.ExecuteNonQuery();

If in case that the user, did not browser for a picture, then, I have to use the nopho.jpg that is stored in the images/folder of my web app. How am I be able to do this?