capture image through webcam and store in database

Question

<script type="text/javascript"> 

function savePhoto() { 

var data = embed.toDataURL(); 

var title = $("#title").val();              

$.ajax({                 

type: "POST",                 

url: "Security_GatePass.aspx",                 

data: 'data1=data', }).done(function (o) {                 

alert("Photo Saved Successfully!");

 }); } 

</script>

<div> <object width="405" height="190"> 
<param name="movie" value="WebcamResources/save_picture.swf"/> 
<embed src="WebcamResources/save_picture.swf" width="405" height="190"/>
 </object>
 </div>
i can capture image by this but i can't save the captured image in database..
i tried like this codebihind..

 String source = Request.Form["photo"]; 
 source =source.Substring(source.IndexOf(",") + 1);
 byte[] photo =Convert.FromBase64String(source);     
photoParam.Value = photo;
Line 55: String source = Request.Form["photo"]; Line 56: // remove extra chars at the beginning Line 57: source = source.Substring(source.IndexOf(",") + 1); Line 58: byte[] photo = Convert.FromBase64String(source); Line 59: photoParam.Value = photo;
Object reference not set to an instance of an object. to Line 57.
But its not working..
plz help me

thank you in advance