ASP.NET Archives

Monitor .NET CLR Garbage Collected heap from your web application

Windows Server / By Jan Reilink / 04/02/2022

Are you worried about your .NET webapp running out of memory? In order to let your .NET (web) application run smooth over a longer period of time, it is important to monitor the .NET CLR Garbage Collector (GC) and collection. The what? The .NET Common Language Runtime Garbage Collector. Here is how you can monitor this in a Zabbix template using Powershell WMI / CIM and Win32_PerfRawData_NETFramework_NETCLRMemory Windows Performance Counters.

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How to optimize Umbraco 8 performance

Umbraco / By Jan Reilink / 23/12/2021

Out of the box, Umbraco is a well built and pretty fast content management system. However, it is still important you perform some steps to further optimize Umbraco’s performance and loading speed. Here on Sysadmins of the North, I wrote about 11+ tips to optimize Umbraco 7 CMS earlier, and in this post I write about implementing them in Umbraco 8.

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How to fix System.Collections.Generic.KeyNotFoundException “The given key was not present in the dictionary” Exception with MySQL Connector/NET and utf8mb4 character set

MySQL / By Jan Reilink / 18/10/2019

An System.Collections.Generic.KeyNotFoundException “The given key was not present in the dictionary” can be the result of using a too old MySQL Connector/NET version in your ASP.NET web application. A KeyNotFoundException is thrown when an operation attempts to retrieve an element from a collection using a key that does not exist in that collection. An unsupported character set like utf8mb4 can be such a key, if your Connector/NET doesn’t support this character set. Luckily there is an easy workaround for this.

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How to fix System.Collections.Generic.KeyNotFoundException “The given key was not present in the dictionary” Exception with MySQL Connector/NET and utf8mb4 character setRead More »

ASP and ASP.NET connectionstring examples for Microsoft SQL Server and MySQL

Code base / By Jan Reilink / 17/10/2018

A connectionstring is sometimes a bit obscure. Do I need ODBC or OLE DB? When you need one and Google for it, you often find old ones that either don’t work at all anymore, or are not optimal. This article provides you with a couple of ASP.NET to SQL Server connectionstring examples, and as a bonus for ASP to MySQL too.

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MySQL Connector/ODBC C# test script

Code base / By Jan Reilink / 03/10/2018

Whenever you need to test your ASP.NET connection to your MySQL database, using ODBC, you can use the following C# test script. Currently it uses MySQL ODBC 8.0 Unicode Driver, but you can easily change the version used. As a bonus it prints some connection information and it requires an SSL connection to your MySQL database (SslMode=REQUIRED).

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How to: Determine which .NET Framework versions are installed

Windows Server / By Jan Reilink / 07/09/2017

Users can install and run multiple .NET Framework versions on their computers. When you develop or deploy your app, you might need to know which .NET versions are installed on the user’s computer.

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Remove IIS Server version HTTP Response Header

Windows Server / By Jan Reilink / 06/07/2014

Windows Server IIS loves to tell the world that a website runs on IIS. It does so with the Server: header in the HTTP response, as shown below. In this post I’ll show you how to remove HTTP response headers in Windows Server IIS. You don’t want to give hackers too much information about your servers, right?.

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How to: Test MySQL database connectivity in ASP.NET, PHP, ASP

Code base / By Jan Reilink / 26/05/2014

Simple MySQL connection test from your website with ASP.NET, PHP & classic ASP. Whenever you need a MySQL connectivity test from a website or server, it’s handy to have various test scripts nearby. Whether it is because you are setting up a new website or you have just installed a new server and are running your tests.

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Configure SQLServer sessionState for Umbraco

Umbraco / By Jan Reilink / 23/04/2014

Configure Umbraco for SQLServer sessionState storage, for your sessions. This post explains how to prepare your Umbraco website for a high performance web garden or web farm, and load balancing environments: Store your ASP.NET / Umbraco sessions out-of-process (OutProc). As opposed to the default in-process (inProc) sessions, where sessions are saved in the worker process.

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Add (custom) headers to MailMessage class

Code base / By Jan Reilink / 23/04/2014

How to add custom headers to System.Net.Mail? When sending an email using the MailMessage class (System.Net.Mail namespace) in an ASP.NET website, certain email headers like Message-ID are not always set. When a Message-ID header is missing, email might be blocked by the recipients SMTP server like Gmail. Therefore it is necessary to set such headers.

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Target multiple ASP.NET versions with AppCmd.exe

Windows Server / By Jan Reilink / 18/02/2014

When administering an IIS web server you frequently have to use AppCmd.exe to make configuration changes. Whether it is for a specific web site or server wide. Some think AppCmd is very limited: if you don’t know the options to use, you may think you can only address the x64 .NET Framework version, or only x86, or you can only target the current active .NET Framework version. Fortunately this is not true, you can address both x86 and x64 versions of .NET with AppCmd. Read how…

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Fix "Could not establish trust relationship for the SSL/TLS secure channel" error

Windows Server / By Jan Reilink / 17/07/2013

Today one of our clients received a System.Net.WebException error on a newly deployed ASP.NET web application. Part of the exception was: “System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.”. Here is how we resolved that issue.

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ASP.NET performance: what to keep in mind

Windows Server / By Jan Reilink / 13/07/2013

(ASP).NET programmers have to keep certain rules in mind when developing high performance ASP.NET applications, and/or optimizing your existing ASP.NET website. A lot of information is available on this subject. In this post I’ll share some valuable posts, and I continue to update this post when I find something new. Posts about ASP.NET performance I frequently pass on to customers so they can improve their ASP.NET web applications.

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How to send authenticated SMTP over a TLS encrypted connection, in PHP, ASP and ASP.NET?

Code base / By Jan Reilink / 15/05/2013

If you want to send email securely from your website, this post is for you! In this post I’ll provide some script examples for ASP, PHP, and ASP.NET (C# / VB.Net – System.Net.Mail) that you can easily integrate and use to securely send email from your website.

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MySQL Connector/NET and Entity Framework

Web applications / By Jan Reilink / 26/02/2013

How to let MySQL Connector/NET and Entity Framework play nicely. This blog post is a quicky and an oldy… Since we still receive a reasonable amount of questions about this topic at the customer service of my employer I’m posting this here, with some commonly made mistakes and points of attention.

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