ASP.NET Event Validation and “Invalid Callback Or Postback Argument”

http://odetocode.com/blogs/scott/archive/2006/03/21/asp-net-event-validation-and-invalid-callback-or-postback-argument-again.aspx

How can I convert a string to boolean in JavaScript?

var isTrueSet = (myValue === 'true');

JavaScript isNaN() Function

Check whether a number is an illegal number:

var a = isNaN(123) + "<br>";
var b = isNaN(-1.23) + "<br>";
var c = isNaN(5-2) + "<br>";
var d = isNaN(0) + "<br>";
var e = isNaN("Hello") + "<br>";
var f = isNaN("2005/12/12") + "<br>";

var res = a + b + c + d + e + f;

false
false
false
false
true
true

jQuery .change() event on asp.net dropdownlist isn't firing correctly

   $('#<%= Update_StatusDropDownList.ClientID %>').change(function() {
                alert($(this).val());
            });

Jquery check textbox entered value is decimal with single dot for multiple textboxes

 <script type="text/javascript">

        $('input[id$=Text1],input[id$=Text2],input[id$=Text3]').keypress(function (event) {

            return isNumber(event, this)

        });


        // THE SCRIPT THAT CHECKS IF THE KEY PRESSED IS A NUMERIC OR DECIMAL VALUE.
        function isNumber(evt, element) {

            var charCode = (evt.which) ? evt.which : event.keyCode

            if (
                (charCode != 45 || $(element).val().indexOf('-') != -1) &&      // “-” CHECK MINUS, AND ONLY ONE.
                (charCode != 46 || $(element).val().indexOf('.') != -1) &&      // “.” CHECK DOT, AND ONLY ONE.
                (charCode < 48 || charCode > 57))
                return false;

            return true;
        }
    </script>

How to Create Web API in ASP.Net MVC

http://www.c-sharpcorner.com/UploadFile/4d9083/how-to-create-web-api-in-Asp-Net-mvc/

sql newid()

Yes, newid() is unique. newid() returns a globally unique identifier. newid() will be unique for each call of newid().

Thus, newid() can be used as the value of a primary key of a sql server table. Values returned by newid() can be inserted into a primary key column of type "uniqueidentifier". Here is an example of a "uniqueidentifier" primary key column, with newid() used as the default value:

CREATE TABLE [tblUsers] (
    [UserId] [uniqueidentifier] NOT NULL DEFAULT (newid()),
    [UserName] [varchar](256) NOT NULL,
    PRIMARY KEY ([UserId])
)