problem with comboBox

[tinysoft]

hi every body

i am facing problem with the combo Box ... i want to change its current value on text edite at line Edit ... so i used this slot :

void CheckoutDialog::on_empNoEdit_textChanged(QString number)
{
 
int i=query.record().indexOf(number);
 
 
        ui->empNameBox->setCurrentIndex(i);
 
}

void CheckoutDialog::on_empNoEdit_textChanged(QString number)
{

int i=query.record().indexOf(number);


        ui->empNameBox->setCurrentIndex(i);

}

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at execute the combo box do nothing

could any one tel me what i am missing ?

great thanx