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DotVVM CRUD application with Entity Framework and Cosmos DB

- December 19, 2019

What is DotVVM? DotVVM is open source MVVM framework for ASP.Net Core and OWIN and it is member of .NetFoundation . DotVVM is a free to use under Apache License but also have commercial extensions. DotVVM lets you build interactive web UIs with just C# and HTML using MVVM pattern. DotVVM framework is shipped with many build-in controls like GridView , FileUpload , Validators , and more. Why DotVVM? There are many reason and business scenarios that DotVVM is suitable for and very helpful like: Migrating legacy ASP.Net web forms application to .Net Core. New ASP.Net applications that contains many forms with a lot of controls/components. To learn more about DotVVM framework visit DotVVM.com . What is Azure Cosmos DB? Azure Cosmos DB is a NoSQL distributed and fully managed database service. Azure Cosmos DB provides different API for different NoSQL models like Document databases, Column databases, Graph databases and Key-Value database. You

Clean your JSON object before saving into Cloud Firestore database

- February 02, 2019

If you have a registration form and you are collecting user's inputs to json object like user = { 'first_name' : 'Amir', 'middle_name':'', 'last_name':'Ismail' 'age' : 25, 'address' : '', 'phone':null }; notice middle_name , address , and phone fields have no value (empty string and null). If you want to save this in Cloud Firestore database, these fields will be saved which is not recommended because you are losing one of the advantages of NoSQL document database which any document should contain only fields have value (except your business case requires that field to be exist in all documents even has no value) . To remove empty fields you have to check each input value and save only fields that have value. But if you have big form with many input fields or you have many forms checking each fields will be a nightmare and your code will be dirty. So I tried to write a TypeScrip

ASP.Net MVC : ActionLink with bootstrap icon

- October 22, 2018

How many times you wanted to add an icon to your action link?!. using Html.ActionLink method is not possible to add icon as it renders the link with just HtmlAttribute you provide. ex : @Html.ActionLink("My Link","actionName","controllerName",new {id = Model.Id}, new {style="margin:10px", @class="btn btn-info"}); this will be rendered as shown in if I want to add icon using bootstrap css classes, I can not use HtmlHelper methods and have to use plain html tags like this <a href="url-here" class="btn btn-info" style="margin:10px;"> <i class="glyphicon glyphicon-pencil"></i> <span>My Link</span> </a> this will be rendered as so to simplify my .cshtml file and make it easy for developers to add icon to their action links, I have created an extension method IconActionLink that will replace the previous html sinppe

AutoComplete using customized UIHint attribute in ASP.Net MVC

- August 13, 2016

In one project I worked on recently, I wanted to display list of suppliers which is very very long list, it was more than 6000 items. to display such number of items in dropdown list in a page of course will affect page load time. The best solution was using Autocomplete jQuery plugin , it is light, powerful, and covers my needs but unfortunately I need to display that suppliers list in many pages for different view models. One of possible solutions copy/paste autocomplete code snippet in each view.This solution didn't make me satisfied and I thought of course there is better way and more elegant to do it. One possible alternative is Editor Template, in most cases we need the Id value not the item full details. for simplicity I'm using list of programming languages as a data source. I override UIHint attribute to pass the URL of our datasource, the URL will be used as source for autocomplete jQuery plugin. public class AutoCompleteUIHintAttribute : UIHintAttribute {

5 Tips to Improve ASP.NET Application Performance

- April 04, 2013

Web application is designed to handle hundreds and thousands of requests per seconds so to handle these requests effectively and successfully it is important to resolve any potential performance bottlenecks. Now we will state some tips that improve the performance of your web application. 1 - Cache Commonly used objects You can cache commonly used objects in ASP.Net using Cache class that provides an extensive caching mechanism that storing resources and allow you to: Define an expiration for a cached object either by specified a TimeSpan or a fixed DateTime . Define priority for cached objects. when there is a memory lack and objects need to be freed. Define validity for a cached object by adding dependacies Attach callbacks to cached objects,so when an objects is removed from cache the callback is invoked. you can add objects to cache by adding it to cache Dictionary Cache["Mykey"] = myObject; or using Insert method of Cache class Cache.Insert("MyKe

Android : How to change progress bar color at runtime programmatically?

- September 06, 2012

I faced this problem while creating one of my android applications(in fact, it is my first application :) ). Lets consider we want to create an android application to calculate the commitments progress of a certain category for http://area51.stackexchange.com/ website ( note we will display a progress bar with one color red or green for simplicity ). Each time we run this application it calculate the commitment percentage and display a red progress bar if it is less than 50% or green one if it equal or greater than 50%. For learning purpose we will insert the number of total required committed users and the number of committed users and calculate the progress of commitment process. Now lets write our code. If it is your first android application you can refer to this post to know how to create an android application. How to create the full layout of this simple application is beyond this post, we will concentrate on the progress bar. The following code snippet is the

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