Connector/NET Archives

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Codebase

2025-08-03

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 Connector/NET and utf8mb4 character set can cause an exception System.Collections.Generic.KeyNotFoundException “The given key was not present in the dictionary”.

Test MySQL database connectivity with MySql.Data.MySqlClient

MySql.Data.MySqlClient ASP.NET test script

Web applications

Last updated: 2026-04-19

MySQL Connector/NET and Entity Framework

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.

Windows Server

Last updated: 2025-11-18

MySQL Connector/NET 6.5 in partial trust

How to use MySQL Connector/NET 6.5 with MySqlClientPermission Class in partial (medium) trust