Csharp .NET 3.5 中的现有连接被远程主机强行关闭

我正在编写一个用于查看、归档和恢复SQL数据的程序.

调用以下方法数次(5-10)，以获取数据库表的所有名称:

public List<string> GetAllTables(string sDatabase)
{
    List<string> result = new List<string>();

    try
    {
        using (SqlConnection con = new SqlConnection(dbConnection.conString + sDatabase))
        {
            con.Open();

            using (SqlCommand command = new SqlCommand("SELECT name FROM sys.Tables", con))
            {
                using (var reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        result.Add(reader["name"].ToString());
                    }
                }
            }
        }

        return result;
    }
    catch (SqlException sqlEx)
    {
        string methodName = (new System.Diagnostics.StackTrace()).GetFrame(0).GetMethod().Name;
        string className = (new System.Diagnostics.StackTrace()).GetFrame(0).GetMethod().DeclaringType.Name;
        Debug.Print("Error in class {0} - method: {1}: {2}", className, methodName, sqlEx.Message);
        return result;
    }
}

错误发生在var reader = command.ExecuteReader().奇怪的是，这并不是每次都会发生.每秒恢复都成功，不会引发错误.

异常堆栈跟踪如下所示:

Error in class DatabaseWorker - method: GetAllTables: Transmission-level error when sending the request to the server. (provider: TCP-Provider, error:0 - An existing connection was closed by the remote host.)
by system.Data.SqlClient.SqlConnection.onError(SQLException exception, Boolean breakConnection)
by system.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
by system.Data.SqlClient.TdsParserStateObject.WriteSni()
by system.Data.SqlClient.TdsParserStateObject.ExecuteFlush()
by system.Data.SqlClient.TdsParser.TdsExecuteSQLBatch(String text, Int32 timeout, SqlNotificationRequest notificationRequest, TdsParserStateObject stateObj)
by system.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
by system.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
by system.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
by system.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
by system.Data.SqlClient.SqlCommand.ExecuteReader()
for sql_data archiving.fashion model.DatabaseWorker.GetAllTables(String sDatabase)