How to connect sql server 2005??

Hi Go through below links, First check config file connection string and its tag is proper then make sure providers are added in config file, there may be case dll corrupt, visual studio might need to repair

https://social.msdn.microsoft.com/Forums/en-US/d1018ddb-8e04-43a2-a539-4245c90a0588/the-type-initializer-for-systemdatasqlclientsqlconnection-threw-an-exception?forum=adodotnetdataproviders

https://www.codeproject.com/Questions/1118154/The-type-initializer-for-system-data-sqlclient-sql

https://stackoverflow.com/questions/6922879/exception-type-initializer-for-system-data-sqlclient-sqlconnection

https://social.msdn.microsoft.com/Forums/en-US/62abb030-1fa6-4cfe-948c-31c56432b25a/can-not-connect-to-server-the-type-initializer-for-systemdatasqlclientsqlconnection-threw-an?forum=adodotnetdataproviders

https://www.eonesolutions.com/help-article/the-type-initializer-for-system-data-sqlclient-sqlconnection-threw-an-exception/