BeginTransaction return null connectionstring [closed] - sql-server

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I use dapper ORM with unit of work
using IDbConnection/IDbTransaction processing (Close/Commit/Rollback)
public IDbTransaction BeginTransaction(string connectionName = "", bool useWadminUser = false, IsolationLevel isolationLevel = IsolationLevel.ReadCommitted)
{
using (DbConnection db = GetDbconnection(connectionName, useWadminUser))
{
db.Open();
_dbTransaction = db.BeginTransaction();
}
return this._dbTransaction;
}
DbConnection GetDbconnection(string connectionName = "", bool useWadminUser = false)
{
UserInfoHelper userInfoHelper = _iSecurityAuthorizService.GetCookieProfileUser();
return new SqlConnection(
string.Format(_config.GetConnectionString(string.IsNullOrEmpty(connectionName) ? SqlHelper.DefaultConnection : connectionName),
SqlHelper.WadminUserName, SqlHelper.WadminPassword));
}
I call service var tran= _dapper.BeginTransaction();
but tran is null.
Please see this this pic1

Answer 1

public IDbTransaction BeginTransaction(string connectionName = "", bool useWadminUser = false, IsolationLevel isolationLevel = IsolationLevel.ReadCommitted)
{
using (DbConnection db = GetDbconnection(connectionName, useWadminUser))
{
db.Open();
_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.