textbox AutoComplete not working after a search query - vb.net

Question

Hello there I am quite new to windows form programming, and my project requires me to do a search query on my database. I would like the option for the names that can be currently searched to be displayed when typing, however, after pressing the search button the autocomplete no longer displays when I try to look for another attribute. https://i.stack.imgur.com/Wytdy.png , https://i.stack.imgur.com/Qjy5q.png
Dim con As New SQLiteConnection(ConnectionString)
Dim cmd As New SQLiteCommand(mSQL, con)
con.Open()
Dim da As New SQLiteDataAdapter(cmd)
da.Fill(ds, "customers")
dt = ds.Tables(0)
MaxRows = ds.Tables("customers").Rows.Count
con.Close()
Dim msSQL As String = "SELECT * FROM customers;"
dgvCustomerInfo.DataSource = display(msSQL, "customers")
Try
dt = New DataTable
con.Open()
With cmd
.Connection = con
.CommandText = "SELECT DISTINCT fname FROM customers"
End With
da.SelectCommand = cmd
da.Fill(dt)
Dim r As DataRow
txtSearchName.AutoCompleteCustomSource.Clear()
For Each r In dt.Rows
txtSearchName.AutoCompleteCustomSource.Add(r.Item(0).ToString)
Next
''''''''''''''''''''''''
Catch ex As Exception
MsgBox(ex.Message)
End Try
con.Close()
da.Dispose()

Answer 1

I believe your problems stem from the AutoCompleteMode. Suggest and SuggestAppend seem to fill in the text box as expected. Append seem to do nothing. I don't think this is working as intended.
I tested with a little database I have. It is Sql Server but should work the same for Sqlite. I used a bit of Linq magic to get the AutoCompleteCustomSource. A few other changes... Using...End Using blocks ensure that database objects are closed and disposed. You don't need a DataAdapter, just a DataTable and Command.
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim dt = GetDataForTextBox()
Dim strArray = dt.AsEnumerable().[Select](Function(x) x.Field(Of String)("Name")).ToArray()
TextBox5.AutoCompleteSource = AutoCompleteSource.CustomSource
Dim MySource As New AutoCompleteStringCollection()
MySource.AddRange(strArray)
TextBox5.AutoCompleteCustomSource = MySource
TextBox5.AutoCompleteMode = AutoCompleteMode.SuggestAppend
End Sub
Private Function GetDataForTextBox() As DataTable
Dim dt As New DataTable
Using cn As New SqlConnection(My.Settings.CoffeeConnection),
cmd As New SqlCommand("Select Distinct Name From Coffees", cn)
cn.Open()
dt.Load(cmd.ExecuteReader)
End Using
Return dt
End Function
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim dt = GetSearchResults(TextBox5.Text)
DataGridView1.DataSource = dt
End Sub
Private Function GetSearchResults(name As String) As DataTable
Dim dt As New DataTable
Using cn As New SqlConnection(My.Settings.CoffeeConnection),
cmd As New SqlCommand("Select * From Coffees Where Name = #Name", cn)
cmd.Parameters.Add("#Name", SqlDbType.VarChar, 100).Value = name
cn.Open()
dt.Load(cmd.ExecuteReader)
End Using
Return dt
End Function