Your shared code ok but one issue here.

Display captured Image from Web Cam in ASP.Net GridView using C#

Image save as dd-MM-yy hh-mm-ss (16-11-22 11-05-58)

It will be save like Id or emp id then it is possible.

please help sir.

namespace ash_vhcl_entry
{
    public partial class cgp : System.Web.UI.Page
    {
        int empno = 0;
        protected void Page_Load(object sender, EventArgs e)
        {
            empno = Convert.ToInt32(Request.QueryString["Id"].ToString());
            Session["EmpId"] = empno;
            if (!IsPostBack)
            //if(Page.IsPostBack)
            {
                BindTextBoxvalues();

            }
        }
        [WebMethod()]
        public static bool SaveCapturedImage(string data)
        {
            string fileName = DateTime.Now.ToString("dd-MM-yy hh-mm-ss");

            //Convert Base64 Encoded string to Byte Array.
            byte[] imageBytes = Convert.FromBase64String(data.Split(',')[1]);

            //Save the Byte Array as Image File.
            string filePath = HttpContext.Current.Server.MapPath(string.Format("~/Captures/{0}.jpg", fileName));
            File.WriteAllBytes(filePath, imageBytes);
            return true;
        }
    }
}