[vb.net expr]send text onchange form <---> class --> update dgv

[freakyme]

I have a question and hope it's possible

i have a form with a datagridview with textboxes above (see picture).
What i want to do is from the moment i type a character in a textbox he start searching in the datagridview. With other words... he has to look for it on textChanged.

i taught i make in my form a function

Function selectCustomer() As String
        Dim i, t As Integer
        Dim searchstring As String
        Dim string1, string2, string3 As String
        Dim name, lastname, address, zipcode, city, speciality, phone As String
 
        name = Me.txtSearchCustomerName.Text
        lastname = Me.txtSearchCustomerLastname.Text
        address = Me.txtSearchCustomerAddress.Text
        zipcode = Me.txtSearchCustomerZipcode.Text
        city = Me.txtSearchCustomerCity.Text
        speciality = Me.cmbSearchCustomerSpeciality.Text
        phone = Me.txtSearchCustomerTelephone.Text
 
 
        string1 = "SELECT ... FROM ... "
        string3 = ";"
        string2 = String.Concat("WHERE ", strCustomerName, " LIKE '%", name, "%' AND '", strCustomerLastName, "LIKE '%", lastname, "%'etc...")
 
        searchstring = String.Concat(string1, string2, string3)
        Return searchstring
    End Function

from the moment the text in a textbox change, it has to send (don't know how) the string (searchstring) to the class data_function where it makes a connection with the databank, get the data from the databank and send it back to the form and update the datagridview. And that for all the characters i type in all the textboxes (+1 combobox) i have above the datagridview.

is this possible and how...
(if it is not a problem for you, please explain with some code...)

i hope its clear for you

greetz freakyme