Asp.Net - check/validate cookies support

Here is a code for checking/validating that user device (browser) supports cookies. in other words this code checks if cookies are enabled on the browser.

Here the code implemented in the Login page:

    // Constants:
    protected const string QUERYSTRING_CHECK_COOKIE = "checkcookie";
    protected const string TEST_COOKIE_NAME = "check_cookie";
    protected const string TEST_COOKIE_VALUE = "ok";

    // On-load event, at page load:
    protected override void OnLoad(EventArgs p_eventArgs)
    {
        if (IsPostBack == false)
        {
            // Check if browser support cookies
            if (Request[QUERYSTRING_CHECK_COOKIE] == null)
            {
                // try to insert cookie:
                Response.Cookies.Add(new HttpCookie(TEST_COOKIE_NAME, TEST_COOKIE_VALUE));
                string newUrl = string.Format("Login.aspx?{1}=1", QUERYSTRING_CHECK_COOKIE);
                this.Redirect(newUrl, true);
                return;
            }
            else
            {
                // here, client sould contain test cookie:
                HttpCookie cookie = Request.Cookies[TEST_COOKIE_NAME];
                bool isCookieEnabled = cookie != null && cookie.Value == TEST_COOKIE_VALUE;
                if (isCookieEnabled == false)
                {
                    // cookies are disabled!!! show error message
                    Label1.Text = "Device NOT support Cookies!";
                    return;
                }
            }

        }
    }

You can implement this also in other pages than Login page.
:)

Javascript html date control (validation)

Here is a sample code for an html input date control include DATE validation!
I searched a lot for such method for integration with PHP page but was little difficult.

Here is the HTML CODE:

<input id="inputDate1" name="Field1" value="21/07/2006" type="text" onblur="validateDate(this, '/')" maxlength="10">

<button onclick="setTodayDate(this.previousSibling, '/')">today</button>

Here is the JAVASCRIPT CODE:

function validateDate(p_inputObj, delim)
{
var text = p_inputObj.value;
var errorMsgs = "Following error(s) :\n";
var isDateCorrect = true;

var delim1 = text.indexOf(delim);
var delim2 = text.indexOf(delim, delim1+1);
if (delim2 <= delim1)
{
isDateCorrect = false;
errorMsgs = errorMsgs + "- Must be in format of dd/mm/yyyy like (21/09/2008)\n";
}
else
{
var day = parseInt(text.substring(0, delim1), 10);
var splitter1 = text.substring(delim1, delim1+1);
var month = parseInt(text.substring(delim1+1, delim2), 10);
var splitter2 = text.substring(delim2, delim2+1);
var year = parseInt(text.substring(delim2+1), 10);

if (isNaN(day) || isNaN(month) || isNaN(year))
{
isDateCorrect = false;
if (isNaN(day)) { errorMsgs = errorMsgs + "- Day not in correct format!\n"; }
if (isNaN(month)) { errorMsgs = errorMsgs + "- Month not in correct format!\n"; }
if (isNaN(year)) { errorMsgs = errorMsgs + "- Year not in correct format!\n"; }
}
else
{
if (day<1)
{
errorMsgs = errorMsgs + "- Day must be between grater than 0\n";
isDateCorrect = false;
}

if (month>12 || month<1)
{
isDateCorrect = false;
errorMsgs = errorMsgs + "- Month must be between 01 to 12\n";
}
else
{
if (month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12 )
{
if (day>31)
{
errorMsgs = errorMsgs + "- Day must be between 1 to 31\n";
isDateCorrect = false;
}
}
else if(month==2)
{
// is leap year
if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))
{
if (day>29)
{
errorMsgs = errorMsgs + "- Day must be between 1 to 29\n";
isDateCorrect = false;
}
}
else
{
if (day>28)
{
errorMsgs = errorMsgs + "- Day must be between 1 to 28\n";
isDateCorrect = false;
}
}
}
else
{
if (day>30)
{
errorMsgs = errorMsgs + "- Day must be between 1 to 30\n";
isDateCorrect = false;
}
}
}

if (year<2000)
{
isDateCorrect = false;
errorMsgs = errorMsgs + "- Year not valid. must be more than 2000!\n";
}
else if (year>9999)
{
isDateCorrect = false;
errorMsgs = errorMsgs + "- Year must be 4 digits!\n";
}
}
}

if (isDateCorrect == true)
{
var newStr = (day<10 ? '0' : '') + day + delim +
(month<10 ? '0' : '') + month + delim +
year; // +" "+hour+":"+minute+" "+AMPM;
p_inputObj.title = '';
var date = new Date();
date.setFullYear(year, month-1, day);
p_inputObj.dateVal = date;
p_inputObj.value = newStr;
p_inputObj.style.backgroundColor='#FFFFFF';
return true;
}
else
{
//alert(errorMsgs);
errorMsgs = errorMsgs.substring(0, errorMsgs.length-1);
p_inputObj.dateVal = null;
p_inputObj.title = errorMsgs;
p_inputObj.style.backgroundColor='#ffaaaa';
p_inputObj.focus();
return false;
}
}

function setTodayDate(p_inputObj, p_delim)
{
var dtNow = new Date();
var day = dtNow.getDate();
var month = dtNow.getMonth() + 1;
var year = dtNow.getFullYear();
p_inputObj.value = (day<10 ? '0' : '') + day + p_delim +
(month<10 ? '0' : '') + month + p_delim +
year;
}

Date format if dd/MM/yyyy but it can also be MM/dd/yy or yyyy!
Enjoy... :)

Validation Israel ID

try
{
string txtId = p_text.PadLeft(9, '0');

int sum = 0;
int[] arrIdDigits = new int[9];
for (int i = 0; i < arrIdDigits.Length; i++)
{
arrIdDigits[i] = int.Parse(p_text[i].ToString());

if (i % 2 != 0)
{
arrIdDigits[i] *= 2;
if (arrIdDigits[i] > 9)
{
arrIdDigits[i] = (arrIdDigits[i] % 10) + 1;
}
}

sum += arrIdDigits[i];
}

sum = (sum % 10);
if (sum == 0)
{
return true;
}
}
catch (Exception ex)
{
}

return false;