Update txt file after clearing line in Qt

[mai.osman]

I am trying to update the text file after I cleared a line in the file. When I print after the clear the line is actually cleared but when I reopen the txt file the line is still there.
Here is the Code.

void myAccounts::on_removeB_clicked()
{
    myFile = new QFile("accountsDB.txt");
    if(!myFile->open(QIODevice::Text | QIODevice::ReadWrite))
        qDebug()<<"1!!"<<endl;
    else
     qDebug()<<"3!!"<<endl;
    stream= new QTextStream(myFile);
    QStringList list;
 
    while(!stream->atEnd())
    {
        line=stream->readLine();
        list = line.split(",");
        qDebug()<<ui->tableWidget->currentItem()->text()<<endl;
        qDebug()<<list[0]<<endl;
        qDebug()<<line<<endl;
 
        if(ui->tableWidget->currentItem()->text() == list[0] || ui->tableWidget->currentItem()->text() == list[1])
        {
            line.clear();
            qDebug()<<line<<endl;
            myFile->close();
        }
    }
        ui->tableWidget->removeRow(ui->tableWidget->currentRow());
}

void myAccounts::on_removeB_clicked()
{
    myFile = new QFile("accountsDB.txt");
    if(!myFile->open(QIODevice::Text | QIODevice::ReadWrite))
        qDebug()<<"1!!"<<endl;
    else
     qDebug()<<"3!!"<<endl;
    stream= new QTextStream(myFile);
    QStringList list;

    while(!stream->atEnd())
    {
        line=stream->readLine();
        list = line.split(",");
        qDebug()<<ui->tableWidget->currentItem()->text()<<endl;
        qDebug()<<list[0]<<endl;
        qDebug()<<line<<endl;

        if(ui->tableWidget->currentItem()->text() == list[0] || ui->tableWidget->currentItem()->text() == list[1])
        {
            line.clear();
            qDebug()<<line<<endl;
            myFile->close();
        }
    }
        ui->tableWidget->removeRow(ui->tableWidget->currentRow());
}

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