BeginTransaction return null connectionstring [closed]

public IDbTransaction BeginTransaction(string connectionName = "", bool useWadminUser =   false, IsolationLevel isolationLevel = IsolationLevel.ReadCommitted)
    using (DbConnection db = GetDbconnection(connectionName, useWadminUser))
        _dbTransaction = db.BeginTransaction();
    } <-- Here
    return  this._dbTransaction;

At the pointer above the connection is closed and disposed and the transaction with it. You cannot use transactions like that.

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