Capture image Again if image not currect

Question

i want to capture image again if image not proper in c# using webcam into web application. but below error is generate while recapture image. how to solve this error.

 

Additional information: The process cannot access the file 'C:\VisiterManagment\VisiterManagment\CapturedImage\Image.jpg' because it is being used by another process.

 

i am also deleting existing file using file exist but not working kindly please help me.

 

here is my c# code

string FileName = Path.GetFileName("~/CapturedImage/Image.jpg");
if (File.Exists(Path.GetFileName(FileName)))
{
File.Delete(FileName);
}
if (!this.IsPostBack)
{
if (Request.InputStream.Length > 0)
{
using (StreamReader myreader = new StreamReader(Request.InputStream))
{
string myhexString = Server.UrlEncode(myreader.ReadToEnd());
//string myimagePath = string.Format("~/CapturedImage/" + DateTime.Now.ToString("dd-MM-yy hh-mm-ss") + ".jpg");
string myimagePath = string.Format("~/CapturedImage/Image.jpg");
File.WriteAllBytes(Server.MapPath(myimagePath), ConvertHexToBytes(myhexString));
Session["CapturedImage"] = ResolveUrl(myimagePath);
}
}
}