How to update or Not Update image from database ?

con.Open();
SqlCommand cmd = new SqlCommand("UpdateUserDetailsAug7_SP", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@UserId", ViewState["UserId"]);
cmd.Parameters.AddWithValue("@UserName", txtUserName.Text);
cmd.Parameters.AddWithValue("@DateOfBirth", txtDateofBirth.Text);
cmd.Parameters.AddWithValue("@Salary", txtSalary.Text);

if (FileUploadPhoto.HasFile)
{
   fileName = FileUploadPhoto.FileName;
   filePath = Server.MapPath("~/Images/" + System.Guid.NewGuid() + fileName);
   FileUploadPhoto.SaveAs(filePath);
   fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
   br = new BinaryReader(fs);
   bytes = br.ReadBytes(Convert.ToInt32(fs.Length));
   cmd.Parameters.AddWithValue("@ImagePath", bytes);

}

cmd.Parameters.Add("@Message", SqlDbType.VarChar, 500);
cmd.Parameters["@Message"].Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
string outputValue = cmd.Parameters["@Message"].Value.ToString();
lblMessage.Text = outputValue;
lblMessage.ForeColor = System.Drawing.Color.RoyalBlue;
               
BindUserDetails();
con.Close();