Evaluate a list of values in a column against a combobox value most efficiently - excel

Question

I am trying to delete duplicate values in a temporary list based on a value in a combobox. The code below loops through individual rows to check whether a value matches. It is slow.
Dim ws As Worksheet
Dim i As Long
Set ws = Sheets("TempList3")
On Error Resume Next
For i = Cells(Rows.Count, 2).End(xlUp).Row To 1 Step -1
If Cells(i, 2) <> Sheets("Sheet1").ComboBox2.Value Then
ws.Rows(i).EntireRow.Delete
End If
Next
Is there a way to evaluate the entire column's values against the combobox's value once and then delete all rows on a worksheet. Or perhaps there is a better way?

Answer 1

I used a looping Find function, it deletes the row where the value was found and then it searches again and deletes the next row it finds until it can no longer find the Combo value on the sheet:
Sub find_cell()
Dim find_cell As Range
Set ws = Sheets("TempList3")
stop_loop = False
Do Until stop_loop = True
Set find_cell = ws.Cells.Find(What:=Sheets("Sheet1").ComboBox2.Value, LookAt:=xlWhole)
If Not find_cell Is Nothing Then
ws.Rows(find_cell.Row).EntireRow.Delete
Else
stop_loop = True
End If
Loop
End Sub

Answer 2

Not knowing how many rows you are talking about, I used 10 thousand for my example codes. here are two examples, try the both and see what works best for you.
You can run through the column and unionize the range found, then delete the rows, for example.
See here for example workbook
Sub UnIonRng()
Dim FrstRng As Range
Dim UnIonRng As Range
Dim c As Range, s As String
s = Sheets("Sheet1").ComboBox2
Set FrstRng = Range("B:B").SpecialCells(xlCellTypeConstants, 23)
For Each c In FrstRng.Cells
If c = s Then
If Not UnIonRng Is Nothing Then
Set UnIonRng = Union(UnIonRng, c) 'adds to the range
'MsgBox UnionRng.Address 'remove later
Else
Set UnIonRng = c
End If
End If
Next c
UnIonRng.EntireRow.Delete
End Sub
Or you can try to filter the column B and delete the rows that way:
Sub FilterDeleteRow()
Dim ws As Worksheet
Dim LstRw As Long, Rng As Range, s As String, x
Set ws = Sheets("TempList3")
s = Sheets("Sheet1").ComboBox2
Application.ScreenUpdating = 0
With ws
LstRw = .Cells(.Rows.Count, "B").End(xlUp).Row
x = Application.WorksheetFunction.CountIf(.Range("B:B"), s)
If x > 0 Then
Columns("B:B").AutoFilter Field:=1, Criteria1:=s
Set Rng = .Range("B2:B" & LstRw).SpecialCells(xlCellTypeVisible)
Rng.EntireRow.Delete
.AutoFilterMode = 0
Else: MsgBox "Not Found"
End If
End With
End Sub