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OutSystems: How to set value to expressions | | Eduntye

This article is about a new platform which I have explored and did certification. The name of the platform is OutSystems and it is a low code platform. Low code platform means we have to write a little or no code to develop an application and OutSystems is one those low code platform in the industry right now along with Mendix, Appian etc This post if about a small problem which many of my colleague are facing while exploring OutSystems using its own official courses. In OutSystems Mobile App Development course there is one cl Creating Application Exercise where they have also explained use of expression on any screen and igning values to it. But there is a little thing which many of the developers think is missing and because of this they face problem while igning values to expression using mix of a string, method response or any entity value. One of my friend asked me this problem: Please see attached screenshot from Creating Applications Exercise So I am stuck at Step 3 (b) on page # 13. I am able to set GetAppName() for the Expression but that is not correct. How to set the Expression to Hello from + GetAppName() ? There is no screenshot for this step, perhaps it is too simple but I am not able to locate it. Yes, this is a simple thing to do but because he was doing it first time so got confused. He was not sure how to call method in expression value so he just set Hello from in value not complete expression including GetAppName() method as shown in below screenshot.

OutSystems: How to set value to expressions

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Browser back on triggers previous post action in .NET webform application – solved | | Eduntye

Recently while working on one of my .NET application I was stuck in a strange problem. I created a on and its click event to insert some entry in database and at the end of this action I used below statement to redirect the page for next step. Response.Write(); Note: I used this method to redirect the page because I was doing it in an iframe and wanted to redirect parent page after this step is completed and next step is started. This was working perfectly fine but after moving to next step when I clicked browser back on same action was again fired and I got two similar entries in database. This was strange because I never exacted post event to be actually fired on browser back on because browser used to show a message when there is any post action is required (like we tap browser refresh on after any post action). After some hit and trial I found that the statement above (Response.Write) is causing the issue. This was because the post action was still in progress because I used a trick to redirect instead of simple Response.Redirect. To complete the post event and redirect properly to resolve the page postback issue on browser back on I used below approach in place of above like of statement: Session[next] = true Response.Write(); On parent page I checked if this session exists then redirect to next step if(Session[next] != null && Convert.ToBoolean(Session[next])) { Response.Redirect(next step page url); } After this approach when I clicked browser back on there was not issue of postback. So the conclusion was that Response.Write was actual reason of the issue because it was breaking the flow without completing the post action.

Browser back on triggers previous post action in .NET webform application – solved

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Visual Studio 2017 ISO (offline installer) + Web Installer | | Eduntye

This is a simple guide to offline installer or ISO file for Visual Studio 2017. As you all new Microsoft always provides web installer file for all new releases of Visual studio and on 7th March Microsoft has launched Visual Studio 2017 and this time also they haven't provided offline installer or ISO file of the setup so we are here to explain how you can obtain offline installer or ISO file from this web installer EXE. There are 7 simple steps for doing this: 1. web installer exe from this link 2. After put this file in any folder like C:VS 2017. 3. Open command prompt with admin access and move to your visual studio eve folder using command cd c:CS 2017 4. Now run another command in command prompt vs_setup.exe /layout (vs_setup.exe is your file name so you can write what ever is your file name) 5. This will open a windows to ask location on your drive where you would like to the visual studio offline / ISO installer. 6. Now it will your visual studio and after it is completed you can run setup where you have selected to it and that too without internet connection.

Visual Studio 2017 ISO (offline installer) + Web Installer

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Visual studio 2017 will be launched on 7th March 2017 | | Eduntye

Finally Microsoft is going to launch Visual studio 15 (Visual studio 2017) on 7th March. This version of Visual Studio will be launched at an event which will be organised on 7th and 8th March. This will also be a celebration event for 20th Anniversary of Visual Studio. Day 1 (7th March 2017) of the event will include Keynote and demos by Julia Liuson, Brian Harry, Miguel de Icaza, and Scott Hanselman which can also be viewed on live streaming. They will show new things in Visual Studio, .NET, Xamarin, Azure etc. Day 2 (8th March 2017) will be live interactive training day to teach how to be more productive using the all new Visual Studio 2017. If you are interested in this event then you can register on this link Apart from this live event there will be launch event by the Visual Studio community all around the world where developers can meet and collaborate in their local area. You can even share a short story, video clip or image of your visual studio story. Share your story on Instagram, Twiter or Facebook with #MyVSStory

Visual studio 2017 will be launched on 7th March 2017

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Encryption and Decryption of content using RijndaelManaged Cl in C# | | Eduntye

If you want to encrypt and decrypt data in your .NET application then one of the most simplest and safest way is using RijndaelManaged cl . It is predecessor of Aes but still most of the new users us RijndaelManaged cl because it is easy to plug and use. First we have to generate an encryption key using a p word ans salt. P word and salt could be any string (use base64 string to make your encryption stronger) which we have to convert to bytes array (byte[]) before using them for generating encryption key. Below is the complete example of generating key and encryption and decryption public static byte[] Genera cryptionKey(string p word, string saltString) { byte[] salt = Convert.FromBase64String(saltString); var keyGen = new Rfc2898DeriveBytes(p word, salt, 7845); return keyGen.GetBytes(32); } public static string Encrypt(object data, string p word, string saltString) { try { using (var aes = new RijndaelManaged()) { //get some bytes aes.Key = Genera cryptionKey(p word, saltString); aes.BlockSize = 256; aes.Padding = PaddingMode.PKCS7; //generate an IV aes.GenerateIV(); //get the bytes for our message var plainBytes = Encoding.UTF8.GetBytes(data.ToString()); //start up the encryption using (var ms = new MemoryStream()) using (var cs = new CryptoStream(ms, aes.Crea cryptor(), CryptoStreamMode.Write)) { //write the bytes to the cryptostream cs.Write(plainBytes, 0, plainBytes.Length); cs.FlushFinalBlock(); //get message bytes var msgBytes = ms.ToArray(); //create a new array big enough for the both of 'em var cypherBytes = new byte[aes.IV.Length + msgBytes.Length]; //return the string with the iv as the first 32 bytes. will need this when decrypting System.Buffer.BlockCopy(aes.IV, 0, cypherBytes, 0, aes.IV.Length); System.Buffer.BlockCopy(msgBytes, 0, cypherBytes, aes.IV.Length, msgBytes.Length); //now convert it to base64 string var cypherText = System.Convert.ToBase64String(cypherBytes).TrimEnd(new char[] { '=' }).Replace('+', '-').Replace('/', '_'); //var cypherText = Convert.ToBase64String(cypherBytes); //return cypher text return cypherText; } } } catch (Exception) { return null; } } public static string Decrypt(object cypherData, string p word, string saltString) { try { using (var aes = new RijndaelManaged()) { //get some bytes aes.Key = Genera cryptionKey(p word, saltString); aes.BlockSize = 256; aes.Padding = PaddingMode.PKCS7; //get the bytes for our message string cypherStr = cypherData.ToString(); string incoming = cypherStr.Replace('_', '/').Replace('-', '+'); switch (cypherStr.Length % 4) { case 2: incoming += ==; break; case 3: incoming += =; break; } var cypherBytes = Convert.FromBase64String(incoming); //var cypherBytes = Convert.FromBase64String(cypherData.ToString()); var iv = new byte[aes.IV.Length]; var msgBytes = new byte[cypherBytes.Length - iv.Length]; //we use the first 32 bytes of the cypherdata for the IV System.Buffer.BlockCopy(cypherBytes, 0, iv, 0, iv.Length); System.Buffer.BlockCopy(cypherBytes, iv.Length, msgBytes, 0, msgBytes.Length); //set the IV for the instance aes.IV = iv; //start up the decryption using (var ms = new MemoryStream()) using (var cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write)) { //write the bytes to the cryptostream cs.Write(msgBytes, 0, msgBytes.Length); cs.FlushFinalBlock(); //the plain text has been decrypted. var plainText = System.Text.Encoding.UTF8.GetString(ms.ToArray()); //return plain text return plainText; } } } catch (Exception) { return null; } }

Encryption and Decryption of content using RijndaelManaged Cl in C#

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