DataGridView moves rows to bottom when cell is updated with Unbound data - vb.net

Question

I have a DataGridView that is styled with code and is using data from a SQLite Database
The Database is NOT bound to the DataGridView. A number of events are triggered when I click on a row.
First the Database is updated with today's date.
And the cell that contain's that date reflects the change.
I then call a sort on the column based on the cells value. With this code
dgvLinks.Sort(dgvLinks.Columns(3), ListSortDirection.Ascending)
The process works as expected with no issues IF I omit these lines of code from the Sub Routine ViewSearches() that populates the DataGridView.
If rowCount <= 25 Then
maxRowCount = 25 - rowCount
For iA = 1 To maxRowCount
dgvLinks.Rows.Add(" ")
Next
End If
I can use these empty rows if I make a call to repopulate the DataGridView with ViewSearches()
I am trying to avoid this design as it seems like a over use of resource.
The ERROR that is happening is the 4 rows that contain data are moved to the bottom of the DataGridView and above these 4 rows with data are the empty rows. I will post the relevant code below.
My question How can I keep the empty rows and populate DataGridView so the rows with data are at the top of the DataGridView?
Here is a Screen Shot after I selected LID 2. It is updated and bubbled to the bottom of the DGV.
Private Sub ViewSearches()
Dim intID As Integer
Dim strChannelName As String
Dim strLinkAddress As String
Dim strLastVisit As String
Dim strLinkType As String
Dim rowCount As Integer
Dim maxRowCount As Integer
'Dim emptyStr As String = " "
Using conn As New SQLiteConnection($"Data Source = '{gv_dbName}';Version=3;")
conn.Open()
Using cmd As New SQLiteCommand("", conn)
'cmd.CommandText = "SELECT * FROM LinkTable"
' Line of CODE Above works with If statement in While rdr
'==========================================================
'cmd.CommandText = "SELECT * FROM LinkTable WHERE ytSiteType = 'News'"
cmd.CommandText = "SELECT * FROM LinkTable WHERE ytSiteType = #site"
cmd.Parameters.Add("#site", DbType.String).Value = gvSLT
Using rdr As SQLite.SQLiteDataReader = cmd.ExecuteReader
'dgvLinks.DataSource = rdr
'Statement Above use when DB is bound to dgvLinks
'=================================================
While rdr.Read()
intID = CInt((rdr("LID")))
strChannelName = rdr("ytChannelName").ToString
strLinkAddress = rdr("ytLinkAddress").ToString
strLastVisit = rdr("ytLastVisit").ToString
strLinkType = rdr("ytSiteType").ToString
'If strLinkType = gvSLT Then
dgvLinks.Rows.Add(intID, strChannelName, strLinkAddress, strLastVisit)
rowCount = rowCount + 1
'End If
End While
dgvLinks.Sort(dgvLinks.Columns(3), ListSortDirection.Ascending)
End Using
If rowCount <= 25 Then
maxRowCount = 25 - rowCount
For iA = 1 To maxRowCount
dgvLinks.Rows.Add(" ")
Next
End If
End Using
End Using
'FindEmpty()
End Sub
Click Event with Update to Database
Private Sub dgvLinks_CellClick(sender As System.Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgvLinks.CellClick
selRow = e.RowIndex
If e.RowIndex = -1 Then
gvalertType = "4"
frmAlert.ShowDialog()
Exit Sub
End If
'Dim col As DataGridViewColumn = Me.dgvLinks.Columns(e.ColumnIndex)
Dim row As DataGridViewRow = Me.dgvLinks.Rows(e.RowIndex)
If row.Cells(2).Value Is Nothing Then
gvalertType = "5"
frmAlert.ShowDialog()
Return
Exit Sub
ElseIf gvTxType = "View" Then
webPAGE = row.Cells(2).Value.ToString()
siteID = CInt(row.Cells(0).Value.ToString())
UpdateSiteData()
''MsgBox("Stop " & selRow)
'dgvLinks.ClearSelection()
'dgvLinks.Refresh()
'dgvLinks.RefreshEdit()
Process.Start(webPAGE)
'dgvLinks.Columns.Clear()
''dgvLinks.Rows.Clear()
''ViewSearches()
ElseIf gvTxType = "Delete" Or gvTxType = "Update" Then
gvID = CInt(row.Cells(0).Value)
gvSiteName = row.Cells(1).Value.ToString
gvSiteURL = row.Cells(2).Value.ToString
frmADE.Show()
Close()
End If
End Sub
Update Routine
Public Sub UpdateSiteData()
Dim dateToday = Date.Today
dateToday = CDate(CDate(Date.Today).ToString("M-d-yyyy"))
Using conn As New SQLiteConnection($"Data Source = '{gv_dbName}';Version=3;"),
cmd As New SQLiteCommand("UPDATE LinkTable SET ytLastVisit = #ytLastVisit WHERE LID =" & siteID, conn)
conn.Open()
cmd.Parameters.Add("#ytLastVisit", DbType.String).Value = dateToday.ToString("M-d-yyyy")
cmd.ExecuteNonQuery()
dgvLinks.Rows(selRow).Cells(3).Value = dateToday.ToString("M-d-yyyy")
'Line of code above INSERTS value in Last Visit Column at the correct ROW
'NOT needed if you reload data from the database
'=========================================================================
'dgvLinks.Refresh()
'dgvLinks.RefreshEdit()
dgvLinks.Sort(dgvLinks.Columns(3), ListSortDirection.Ascending)
End Using
End Sub
You will see a number of things I have tried commented out.
As I said I can FIX the issue if I make a call to the ViewSearches() Sub Routine.
Private Sub StyleDGV()
'Sets Design of the DataGridView
'===============================
dgvLinks.DefaultCellStyle.Font = New Font("Times New Roman", 13.0F, FontStyle.Bold)
dgvLinks.ColumnCount = 4
dgvLinks.Columns(0).Width = 60 'ID
dgvLinks.Columns(1).Width = 325 'Site Name 325
dgvLinks.Columns(2).Width = 860 'Site Url 860
dgvLinks.Columns(3).Width = 154 'LastVisit 140
'Option with no blank rows increase col count to 5
'OR increase width of col(3) WHY? because the scroll bar is not showing
' TOTAL Width 1450 Height 488
'=============================
'To Set Col Header Size Mode = Enabled
'To Set Col Header Default Cell Styles DO in Properties
'dgvLinks.Columns(6).DefaultCellStyle.Format = "c"
dgvLinks.ColumnHeadersHeight = 10 'Sans Serif 'Tahoma
dgvLinks.ColumnHeadersDefaultCellStyle.Font = New Font("Sans Serif", 12.0F, FontStyle.Bold)
dgvLinks.ColumnHeadersDefaultCellStyle.ForeColor = Color.Blue
dgvLinks.DefaultCellStyle.BackColor = Color.LightGoldenrodYellow
'DGV Header Names
dgvLinks.Columns(0).Name = "LID"
dgvLinks.Columns(1).Name = "Site Name"
dgvLinks.Columns(2).Name = "Site URL"
dgvLinks.Columns(3).Name = "Last Visit"
dgvLinks.Columns(0).SortMode = DataGridViewColumnSortMode.NotSortable
dgvLinks.Columns(1).SortMode = DataGridViewColumnSortMode.NotSortable
dgvLinks.Columns(2).SortMode = DataGridViewColumnSortMode.NotSortable
dgvLinks.Columns(3).SortMode = DataGridViewColumnSortMode.NotSortable
End Sub
Any one following this question the FIX that permitted keeping the empty rows was to just omit the sort command in the Update to Database Sub Routine

Answer 1

As far as getting the data from the SQLite DB into the grid… you almost have it in the ViewSearches method. The command text looks good; however you are using an SQLiteDataReader. This is resorting to reading the data line by line.
I suggest you use the SQLiteDataAdapter instead. With it you can get the DataTable from the DB in one shot. First create and initialize a DataSet, then create a new SQLiteDataAdapter then add your command to the data adapter something like…
DataSet ds = new DataSet();
using (SQLiteDataAdapter sqlDA = new SQLiteDataAdapter()) {
conn.Open();
sqlDA.SelectCommand = cmd.CommanText;
sqlDA.Fill(ds, “tableName”);
if (ds.Tables.Count > 0) {
//return ds.Tables[“tableName”];
dgvLinks.DataSource = ds.Tables[“tableName”];
}
}
This will add a DataTable to the DataSet ds called “tableName” if the query succeeded.
Then simply use that DataTable as a DataSource to the grid… something like…
dgvLinks.DataSource = ds.Tables[“tableName”];