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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.data.common.dbconnection.open below:

DbConnection.Open Method Definition

When overridden in a derived class, opens a database connection with the settings specified by the ConnectionString.

public:
 abstract void Open();

public abstract void Open();

abstract member Open : unit -> unit

Public MustOverride Sub Open ()

Implements Remarks

This method must be overridden with user-defined behavior. SqlConnection.Open will throw an exception if called again without first being closed.