. Net uses ConfigurationManager to obtain the connection string and. net to obtain the string length.

. Net uses ConfigurationManager to obtain the connection string and. net to obtain the string length.

 

Add

<ConnectionStrings>

<Add name = "SQLConnectionString" connectionString = "database connection string"/>

</ConnectionStrings>

 

You need to add the namespace using System. Configuration on the page;

In Solution Explorer, find the class file and select "Reference", right-click and select "add reference", and find System. Configuration from. net to reference it.

 

Then add

Conn. ConnectionSring = ConfigurationManager. ConnectionStrings ["SQLConnectionString"]. ConnectionString; // specify the database connection string