You are here: Saotn.org » ASP.NET

ASP.NET

Posts and information related to ASP.NET, .NET Core, ASP.NET Core and the .NET Framework

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

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.

Read More »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

ASP and ASP.NET connection string examples for Microsoft SQL Server and MySQL

A connection string 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 connection string examples, and as a bonus for ASP to MySQL too.

Read More »ASP and ASP.NET connection string examples for Microsoft SQL Server and MySQL

Remove IIS Server version HTTP Response Header

Remove HTTP response headers in Windows Server IIS 10 and ASP.NET

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 response server headers in IIS. You don’t want to give hackers too much information about your servers, heh? ;-).

Read More »Remove IIS Server version HTTP Response Header

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

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.

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

Configure SQLServer sessionState for Umbraco

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.

Read More »Configure SQLServer sessionState for Umbraco

Target multiple ASP.NET versions with AppCmd.exe

How to target multiple ASP.NET versions with AppCmd?

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…

Read More »Target multiple ASP.NET versions with AppCmd.exe

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

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.

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

ASP.NET performance: what to keep in mind

(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.

Read More »ASP.NET performance: what to keep in mind

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

Send authenticated SMTP (auth-SMTP) over a TLS encrypted connection. 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) that you can easily integrate in your website.

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