protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        con = new SqlConnection(conString);
        string sqlstring = string.Empty;
        if (Request.QueryString["Id"] != null)
        {
            btnSave.Visible = false;
            btnUpdate.Visible = true;
            String Wherecluase =Request.QueryString["Id"].ToString();
            if (Wherecluase == "" || Wherecluase == string.Empty)
            {
                sqlstring = "select Id,EmployeeName,MobileNumber,CONVERT(varchar(10),DOB,103) as DOB,[Status] from EmployeeList ";
            }
            else
            {
                sqlstring = "select Id,EmployeeName,MobileNumber,EmailID,CONVERT(varchar(10),DOB,103) as DOB,[Status] from EmployeeList where  id = " + Wherecluase ;
            }
            SqlCommand cmd = new SqlCommand(sqlstring, con);
            con.Open();
            SqlDataReader r = cmd.ExecuteReader();
            while (r.Read())