This tutorial is all about How to Autocomplete a TextBox with Multiple Columns Using Visual Basic 2008 And MS Acces Database.
In this tutorial I will show you how to save data and autocomplete a textbox with multiple columns in Visual Basic 2008 and MS Access Database. As I expand my knowledge about autocomplete I discovered that you can put multiple columns/fields on it. So, it depends on you or your query, on how many columns/fields you want to exist.
Let’s begin:
1.Open Visual Basic 2008, create a project and do the Form just like this.
2.Double click the Form and do the following codes above the Form_Load.
Dim query As String
‘DECLARING A VARIABLE AS OLEBDCONNECTION TO REPRESENT AN OPEN CONNECTION TO THE DATA SOURCE
‘IN THIS AREA, YOUR GOING TO PUT A CONNECTION STRING THAT REPRESENTS A PROVIDER AND A DATA SOURCE.
Dim con As OleDb.OleDbConnection = New OleDb.OleDbConnection(“Provider=Microsoft.ACE.OLEDB.12.0;Data Source=” _
& Application.StartupPath & “\people.accdb;”)
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3.In the Form_Load , do this code for the autocomplete of a Textbox.
Try
‘OPENING THE CONNECTION
con.Open()
‘PUTING THE VALUE ON A VARIABLE THAT YOU HAVE BEEN DECLARE ON THE TOP
query = “SELECT * FROM tblpeople”
‘DECLARING A VARIABLE AS OLEDBDATAADAPTER
‘TO REPRESENTS A SET OF DATA COMMANDS AND A DATABASE CONNECTION
‘THAT ARE USED TO FILL THE DATASET/DATATABLE AND UPDATE THE DATA SOURCE
‘PUT HERE YOUR COMMAND TEXT AND A CONNECTION STRING
Dim da As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(query, con)
‘DECLARING A VARIABLE AS DATATABLE
‘REPRESENT ONE TABLE IN THE DATABASE
Dim dt As New DataTable
‘FILLING THE DATATABLE
da.Fill(dt)
‘DECLARING A VARIABLE AS DATAROW
‘REPRESENTS A ROW OF DATA IN THE DATATABLE
Dim r As DataRow
‘CLEARING THE DATA IN THE CUSTOM SOURCE OF A TEXTBOX
txtsearch.AutoCompleteCustomSource.Clear()
‘DECLARING A VARIABLE AS INTEGER AND STORE THE MAX COLUMN OF THE DATATABLE
Dim maxcolumn As Integer = dt.Columns.Count – 1
For Each r In dt.Rows
For i As Integer = 0 To maxcolumn
‘ADDING THE DATA OF THE DATATABLE IN THE CUSTOM SOURCE OF A TEXTBOX
txtsearch.AutoCompleteCustomSource.Add(r.Item(i).ToString)
Next i
Next r
Catch ex As Exception
MsgBox(ex.Message)
End Try
‘CLOSING A CONNECTION
con.Close()
End Sub
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4.Go back to the Design Views, double click the Save Button and do the following code for inserting the data in the Database.
[vbnet] Private Sub btnsave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsave.ClickTry
‘OPENING A CONNECTION
con.Open()
‘PUTTING THE VALUE ON A VARIABLE THAT YOU HAVE BEEN DECLARE ON THE TOP
query = “INSERT INTO tblpeople (FIRSTNAME,LASTNAME,ADDRESS) ” _
& “VALUES (‘” & txtfname.Text & “‘,'” & txtlname.Text & “‘,'” & txtaddress.Text & “‘)”
‘DECLARING A VARIABLE AS OLEDBDATAADAPTER
‘TO REPRESENTS A SET OF DATA COMMANDS AND A DATABASE CONNECTION
‘THAT ARE USED TO FILL THE DATASET/DATATABLE AND UPDATE THE DATA SOURCE
‘PUT HERE YOUR COMMAND TEXT AND A CONNECTION STRING
Dim da As OleDb.OleDbDataAdapter = New OleDb.OleDbDataAdapter(query, con)
‘DECLARING A VARIABLE AS DATATABLE
‘REPRESENT ONE TABLE IN THE DATABASE
Dim dt As New DataTable
‘FILLING THE DATATABLE
da.Fill(dt)
MsgBox(“Data has been save”, MsgBoxStyle.SystemModal, “Save”)
Catch ex As Exception
MsgBox(ex.Message)
End Try
‘CLOSING A CONNECTION
con.Close()
‘CALLING THE FIRST LOAD TO REFRESH THE DATA IN THE CUSTOM SOURCE OF A TEXTBOX
Call Form1_Load(sender, e)
End Sub
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Reminder: you cannot autocomplete a Textbox without doing this, on its properties.
You can download the complete source 
here
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