Difference between Abstract Method and Virtual Method ? - ASP.NET Discussion Boards

In short i would like to develop a weighbridge system. All i want is the code in C-sharp for reading the weight from the scale, it must be real-time.

Please read http://www.codeproject.com/Messages/1278599/How-to-get-an-answer-to-your-question.aspx[^]. This site does not provide code to order.

I am coding with C#.NET
I created an meeting request and attached to the mail. users able to open it and accept the same.
On another scenario, i want to decline the request. so i send an FRESH meeting request attached to the mail with same date & time. this time meeting request is not getting cancelled.

So my question is, do the UID need to be unique to cancel the meeting request?

We don't know how you are implementing "meetings" so how can we possibly know?

This is my code :

        DateTime schBeginDate = TimeZoneInfo.ConvertTimeToUtc(Convert.ToDateTime(Convert.ToDateTime("21/08/2015").ToString("dd-MMM-yyyy") + " 12:00 AM"));
        DateTime schEndDate = TimeZoneInfo.ConvertTimeToUtc(Convert.ToDateTime(Convert.ToDateTime("21/08/2015").ToString("dd-MMM-yyyy") + " 11:59 PM"));        
String[] contents = { "BEGIN:VCALENDAR","VERSION:2.0","PRODID:-//TEST","METHOD:REQUEST",
                              "BEGIN:VEVENT",
        string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", schBeginDate),
            string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.UtcNow),
                string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", schEndDate),
                              "LOCATION:NA", "UID : " + Guid.NewGuid(),
                         "DESCRIPTION:Out Of Office",
        "X-ALT-DESC;FMTTYPE=text/html:Out Of Office",
"SUMMARY:Out Of Office", "STATUS:CONFIRMED","ORGANIZER:MAILTO:" + "test@test.com",
        string.Format("ATTENDEE;CN=\"{0}\";RSVP=TRUE:mailto:{1}", "test", "test@test.com"),
        "BEGIN:VALARM","TRIGGER:-PT15M",
"ACTION:DISPLAY","DESCRIPTION:Reminder","X-MICROSOFT-CDO-BUSYSTATUS:OOF","END:VALARM",
                         "END:VEVENT", "END:VCALENDAR" };

I did not try it myself but what I have read before, to able to cancel a meeting request the Method attribute must be Cancel and the UID must be the same as the original request.

Thanks a lot for your reply. So i conclude that UID should be same to cancel meeting request. If any deviation, please give me an reply.

Once again thanks.

The differences between Virtual method and Abstract method are as follows:

In class, Abstract method has no body but Virtual method has body.
Abstract method can be declared in Abstract class only but there is no need of Abstract class for Virtual method.
Abstract method must be override in Derived class but Virtual method may be override or not.
Abstract method is also called Pure Virtual Method
Abstract method must be declared in Abstract class, we did not create an object of Abstract class.

Demo:-

using System;
namespace LearnProject
{

    abstract class TestClassA
    {
          public void Method1()
        {
            Console.WriteLine("I am in Method1() of TestClassA ");
        }
          public virtual void Method2()
          {
              Console.WriteLine("I am in Method2() of TestClassA ");
          }

          public abstract void Method3();

    }

    class TestClassB : TestClassA
    {
        public  override void Method2()
        {
            Console.WriteLine("I am in Method2() of TestClassB ");
        }

        public override void Method3()
        {
            Console.WriteLine("I am in Method3() of TestClassB ");
        }
    }

    class Abstract_and_Virtual_methods
    {
        public static  void Main()
        {

            TestClassB testClassB = new TestClassB();
            testClassB.Method1();
            testClassB.Method2();
            testClassB.Method3();

            TestClassA testClassA = new TestClassB();
            testClassB.Method1();
            testClassA.Method2();
            testClassA.Method3();

            // TestClassB b = new TestClassA() is not allowed

            TestClassB b = new TestClassB(); 
            b = testClassB; // Object of TestClassB is assigned

            b = testClassA as TestClassB; //  Here We need type cast 

            Console.Read();
        }
    }
}

In the above program, we create three methods in the TestclassA, We override virtual method Method2() and abstract method Method3() in the derived class TestClassB.

Output :-
I am in Method1() of TestClassA
I am in Method2() of TestClassB
I am in Method3() of TestClassB
I am in Method1() of TestClassA
I am in Method2() of TestClassB
I am in Method3() of TestClassB

Note:- If we did not override the virtual method - Method2() of TestClassA in the derived class TestClassB, then output would be as follows :

I am in Method1() of TestClassA
I am in Method2() of TestClassB
I am in Method3() of TestClassB
I am in Method1() of TestClassA
I am in Method2() of TestClassA
I am in Method3() of TestClassB

Did you have a question? Or were you trying to write a Tip?

I do lot fo work by javascript on web page (like validation , enable and disable textbox ,changes the value of label) and when we do a postback by buttonclick all work done by java script is lost , pls suggest how to do this asap.
Thanks

Don't multipost

Write a program to create ‘Employee’ class with id, name non-static members and employeeCounter as Static data member. Accept id, name values from user (using Console.ReadLine() method) and assign them to Employee data members. Count how many objects created for Employee class, display the content using Console application.

No, you write it.

/ravi

My new year resolution: 2048 x 1536
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This looks like homework

modified 20-Sep-20 21:01pm.

I am working on a website that is built in C# MVC. The page i am working on has a datatable and sorting and pagination. The bug is when i click on the Next button on the page, it displays an error asking me to select a value, although there are values selected in subsequent pages. It wont go to the next page until a value has been selected on the first page. I need help on getting away with this bug.

I think you would remove <required> in the model

Remove what in the model? Do you want me to post the code? I am posing this question as I am new to MVC.

Look in the database DAL, there are private and public members in it.
Most MVC Apps use a database model to describe the database and fields when using Entity Framework. You can say this column is required to write a record.

Also, I think in the Models folder, you can say a field is required for validation, so check there as well. The model tells the view that these fields are required for validation.

Technically, makes no sense to me why you would want the user to leave the page without filling in the form first, unless it's a search box or something, and the user has no interest in searching, and the form submit triggers the validation and postback event, and validation fails.

I'm leaving now so I won't back back till tomorrow, but take a peek around in your app.

Database in VB

<Required>
<StringLength(80)>
<MaxLength(80)>
Public Property LoginID As String
   Get
      Return mLoginID
   End Get
   Set(value As String)
      mLoginID = value
   End Set

End Property

Model in C#

public class RegisterExternalLoginModel
{
    [Required]
    [Display(Name = "User name")]
    public string UserName { get; set; }        
    public string ExternalLoginData { get; set; }
}

Remove the required or validation tag
[Required] or <required>

I looked into the code but was unable to find the appropriate [Required] or validation tag. The code uses Datatables and the validation is related to that.I am not able to find the connection between the Next button and the validation.

Show some code in the view for the page.

JavaScript

'

<script type="text/javascript">
        $(function () {
            var grid  =  $('.single-select').DataTable({
                'lengthMenu': ['500']
            });

            $('.single-select tbody').on('click', 'tr', function () {
                if ($(this).hasClass('selected')) {
                    $(this).removeClass('selected');
                    $('#Id1').val('');
                } else {
                    grid.$('tr.selected').removeClass('selected');
                    $(this).addClass('selected');
                    $('#Id1').val($(this).attr('id'));
                }
            });

            var cId = $('#Id').val();

            if (cuId > 0) {
                $("#grid.single-select")
                    .find("[id='" + cId + "']")
                    .addClass('selected');
            }

            var dGrid = $("#dSelect").DataTable({
                'lengthMenu': ['500']
            });
            $('# dSelect tbody').on('click', 'tr', function () {
                if ($(this).hasClass('selected')) {
                    $(this).removeClass('selected');
                    $('#mId').val('');
                } else {
                    dGrid.$('tr.selected').removeClass('selected');
                    $(this).addClass('selected');
                    $('#mId').val($(this).attr('id'));
                }
            });

That looks like script that paints the textbox edges or borders red or blue

JavaScript

<script type="text/javascript">
        $(function () {
            var s = $(".Step");
            var nOS = s.length;
            var csIdx = @Model.csIdx;
            var cS = s [csIdx];
            $('#sCount').val(nOS);


            $(cS).fadeIn(); 


            if (csIdx > 0) {
                $("button[name='prev']").show();
                $("button[name='cancel']").show();
            }

            if (csIdx < nOS - 1) {
                $("button[name='next']").show();
                $("button[name='cancel']").show();
            }
            else {
                $("button[name='finish']").show();
            }

            $("button[name='next'],button[name='finish']").click(function () {

                var $step = $(".Step:visible"); 


                var ifError = false;
                $step.find("input,textarea,select").each(function () {
  if (!$(this).validationEngine('validate')) {                         ifError = true;
                    }

                });

                if (ifError)
                    return false; });

That validates the next or finish button, by checking a textarea element, a large place to enter text, and if false I guess, will cancel the buttons. You can remove the function temporary to see if that does the trick; to locate the code you have to modify.

$("button[name='next'],button[name='finish']").click(function () {