Winform (C #) references the database in the app. config file

Some code in APP. config

<Configuration>

<Deleetask> // note this. If you are not responsible for this, an error will be reported, "What is initialization"

<Add key = "connsqlstr" value = "database link field"/>

// If you want to use a database provider like Web Development (Web. config), add providername to the database provider. If you are not responsible, an error is returned.

</Appsettings>

</Configuration>

 

 

Reference:

String conn = configuration. configurationsettings. receivettings ["connsqlstr"]. tostring ();

Sqlconnection con = new sqlconnection (conn );

 

 

 

For beginners, write your own code. If there are any mistakes, please forgive me.