In VB.NET
Use tablControl1.SelectedTab = MyTabName
In C#
use
tabControl1.SelectedTab = MyTabName;
MytabName will automatically be displayed.
Tag Archives: Visual Studio
c# How to get the UserID of logged in user in mvc5
Add the name space in your controller at the top
using Microsoft.AspNet.Identity;
Wherever you need to get the user id use the following code in your controller
string userId = User.Identity.GetUserId();
c# – new GUID() returns 0
GUID stands for globally unique identifier.
GUIDs are usually stored as 128-bit values, and are commonly displayed as 32 hexadecimal digits with groups separated by hyphens.
Here is an example {21EC2020-3AEA-4069-A2DD-08002B30309D}.
They may or may not be generated from random (or pseudo-random) numbers.
GUIDs generated from random numbers normally contain 6 fixed bits (these indicate that the GUID is random) and 122 random bits; the total number of unique such GUIDs is 222 (approximately 5.3×1036).
The probability of the same number being generated randomly twice is negligible;
Assuming uniform probability for simplicity, the probability of one duplicate would be about 50% if every person on earth as of 2014 owned 600 million GUIDs.
WARNING
—————————————–
Do not use this way as it will only return with all zeros as shown below.
Guid g1 = new Guid(); // g1 will return 00000000-0000-0000-0000-000000000000
——————————————–
Here is the correct wayGuid g1 = Guid.NewGuid(); //g1 will return a proper GUID like {21EC2020-3AEA-4069-A2DD-08002B30309D}
Could not load file or assembly ‘System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35′ or one of its dependencies. The system cannot find the file specified.
Could not load file or assembly ‘System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35′ or one of its dependencies. The system cannot find the file specified.
Scenario
I had a Visual Studio 2013 project using MVC4. The application was working fine in my local machine. But when I deployed the application using FileSystem( in this method all the files for the project gets copied to a folder on your local machine, then you can copy all these files to your webhost and your application should start working.)
I got the following error when I deployed the application using this method.
Could not load file or assembly ‘System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35′ or one of its dependencies. The system cannot find the file specified.
How to Fix it?
I searched on the web for some time to get the answer and in the end I discovered that the System.Web.HTTP.WebHost.DLL file was not being copied to my published folder and hence the error.
1. Go to the solution Explorer in Visual Studio
2. Go to the References
3. Right Mouse Click on the System.Web.HTTP.WebHost entry to check its prooperties and I found that COPY LOCAL proeprty was set to false and hence the file was not being copied to my published folder.
4. I changed the COPY LOCAL to true and then the file gets copied to my published folder and gets deployed correctly.
C#- Creating Custom HTML Helpers – Full Example
Custom HTML Helpers can help seperation of code and html and avoid repetion.
What is a HTML Helper ?
It is just a method that will return a string which can contain any content you wan from a simple string to a table of data.
Why are HTML Helpers useful ?
method that returns a string. The string can represent any type of content that you want. For example, you can use HTML Helpers to render standard HTML tags like HTML <input>
and <img>
tags. In ASP.NET we have many standard HTML Helpers
- Html.ActionLink()
- Html.BeginForm()
- Html.CheckBox()
- Html.DropDownList()
- Html.EndForm()
- Html.Hidden()
- Html.ListBox()
- Html.Password()
- Html.RadioButton()
- Html.TextArea()
- Html.TextBox()
Let us think of a situation.
In a web page we need to list the features of a product.
If the feature is present then show a Tick
If the feature is missing then show a Cross
As shown below.
This is achieved by using two different CSS classes which will render the Tick or the Cross
When I use my CSS class “plain” it will render a Cross
When I use the class “checked” it shows a Tick.
Now in razor view you would typically use the
@Html.DisplayFor(model => model.Alarm) which would render a standard check box ( if true then the checkbox will be ticked and if false the checkbox will be empty) But we want a better display hence we want to make use of our CSS classes.
In order to show the customised CSS we will have to write some logic in the Razor view which is not preferred at all as we would like to keep the logic out from the views and secondly it will need a lot of code as for each item we will have to use some kind of If loop as shown below.
Not recommended
@if (Model.AirConditioning == true)
{
<li class=”ticked”>@Html.LabelFor(model => model.AirConditioning)</li> }
else
{
<li class=”plain”>@Html.LabelFor(model => model.AirConditioning)</li> }
Better Alternative is to write a Custom HTMLHelper
Let us write a Custom HTML Helper for it.
Create a Class
I created a folder called HTMLHelpers in my project and then created a class called myHTMLHelpers.cs as shown below
The content of the class is as below
using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace myapplication.Helpers { public static class myHTMLHelpers { public static IHtmlString TickOrCross(bool content) { string htmlString = ""; if(content==true) { htmlString = String.Format("checked"); // if content is true then we want the CSS class checked } else { htmlString = String.Format("plain"); // if content is falsethen we want the CSS class plain } return new HtmlString(htmlString); } } }
How te make use of this HTML Helper ?
Go to your Razor View
at the top of the page add the namespace under which we created our helper class
@using myapplication.Helpers
at the right place in your razor view I have made use of our custom html helper.
We pass the model value to it and it will set the class name accordingly to display a Tick or a Cross
<ul class=”span2″>
<li class=”@myHTMLHelpers.TickOrCross(Model.AirConditioning)“>Air Conditioning</li>
<li class=”@myHTMLHelpers.TickOrCross(Model.Alarm)“>Alarm</li>
</ul>
The other way would have been to put the logic into the view using the if block in our code,. which is not a good practice.
@if (Model.AirConditioning == true)
{
<li class=”ticked”>Air Conditioning</li> }
else
{
<li class=”plain”>Air Conditioning</li>
}
How to render @html.actionlink as a button in MVC in Razor
How to render @HTML.Actionlink in MVC and using it as a button
Background of @HTML.ACTIONLINK in MVC
The easiest way to render an HTML link in is to use the HTML.ActionLink() helper.
With MVC, the Html.ActionLink() does not link to a view. It creates a link to a controller action.
Razor Syntax:
ASP Syntax:
The first parameter is the link text, and the second parameter is the name of the controller action.
The Html.ActionLink() helper above, outputs the following HTML:
When using @html.actionlink it normally renders it like a hyperlink. But there is a simple way to render it as a button.
Simple example of @HTML.Actionlink
@Html.ActionLink("Register,"Register")
and it will render it as a Hyperlink
How to render @HTML.Actionlink as a button
I am using Boostrap so I have the CSS class called “btn” available. Otherwise you can use your own CSS which can create a button
Here is your Answer below
C# Syntax
@Html.ActionLink("Register", "Register" ,null, new { @class = "btn" })
VB.NET Syntax
@Html.ActionLink("Register", "Register" ,null, new with {.class = "btn" })
the null is for the Routevalues ( in the example we are using any route values hence null)
Hope this helps you
VB.NET – You must call the “WebSecurity.InitializeDatabaseConnection” method before you call any other method of the “WebSecurity” class.
Problem description:
If you are getting the error while running your MVC4 application in VB.NET
You must call the “WebSecurity.InitializeDatabaseConnection” method before you call any other method of the “WebSecurity” class.
Solution
Add the following line in the GLOBAL.ASX
Ensure that you are using the correct connection string and other information as per your own application as shown in the highlighted line above.
VB.NET – ASP NET MVC Area routing/multiple routes issue in VB.NET
Scenario: If you have two controllers with the same name in different areas, then you would end up with errors as shown below, while there are numerous examples available on the web but it took me a while to figure out the correct solution for VB.
Hope it help you and saves you time.
Problem Description
I have a HOME controller in my MVC4 application and then I created a new AREA called SUPERADMIN. I then created a HOME controller in that area as well.I received the following error.
Solution:
1. Fix the Route.Config in your MVC4 project under APP_Start folder. See the yellow coloured text,
vbnull is for constraints( so we are not adding special constraints
the next one “RealEstateVB” is the namespace , RealEstateVB is the name of my application and is taken as the default namespace.
2. Now Go to your AREA. I had an area called SUPERADMIN.
See the highlighted text. You have to define the namespace. eg. I have used “RealEstateVB.Areas.Superadmin for my SuperAdmin area.
Also make a note how I have added superadmin in front of the /{controller}/{action}/{id}
This should get your project going without any errors. For each area you have you will need to fix the xxxAreaRegistration.vb file as described in the above step(2)
Role based Authorization in MVC4 using VB.NET
Here is a simple way to do the role based Authorization in your MVC4 Controllers using VB.NET
IF you have a role called Client then simply add the following text on top of your each ActionResult( which displays the view)
<Authorize(Roles:=”Client”)>
See the following example. The Index View has been restricted and can only be viewed by someone in the Client role.
<Authorize(Roles:="Client")>
Function Index() As ActionResult
Return View(db.Purchasers.ToList())
End Function
Password protect complete MVC4 site in VB.NET
If you want to password protect some pages on your MVC4 site using the Forms Authentication then it is best to to protect the whole site and then selectively allow Anonymous Access to the pages which are to be shown to every visitor.
Open the FilterConfig.VB file and add the line
filters.Add(New AuthorizeAttribute) in it
Once you run your application you would see that all the pages of your website are now protected, the users have to register before they can access.
Imports System.Web Imports System.Web.Mvc
Public Class FilterConfig
Public Shared Sub RegisterGlobalFilters(ByVal filters As GlobalFilterCollection)
filters.Add(New HandleErrorAttribute())
filters.Add(New AuthorizeAttribute)
End Sub
End Class
If you need to allow some pages for anonymous view then add the following decoration.
<AllowAnonymouse()> on each page which you want to open up for anonymous access.
<AllowAnonymous()>
Function Index() As ActionResult
ViewData("Message") = "Modify this template to jump-start your ASP.NET MVC application."
Dim rep As New RepositoryRealEstate
ViewBag.AgentCount = rep.GetAgentsCount
ViewBag.ProperyCount = rep.GetPropertyCount
ViewBag.VendorCount = rep.getvendorcount
Return View()
End Function