Warn the User of empty cell and indicate the location based on values in preceding columns

Question

I am new to VBA. I have a problem which I believe is very simple, but I am failing foolishly. I have to generate a MsgBox warning the user to enter data in blank cells.

I also have to mention the destination of the blank cell by indicating the parameters in the preceding column. Actually my excel list is very big, however, the image I uploaded demonstrates my needs.

In column A I have entered the name of the companies - Ferrari, Audi and Lamborghini, while in Column B I have mentioned their respective cars. In column C,D,E I have mentioned their sales figure for the months. If the user fails to enter the sales figure for one entry, I need to warn him when he checks the data validity.

The message for this image should be : Please Enter the number of units of Lamborghini Aventador and Lamborghini Veneno sold.

In my image, the yellow highlight indicates the data not entered. In my file I have over only one column ( only one month) for sales, but thousands of rows (for cars).

Answer 1

Let's say your data looks like this

Try this

Private Sub CommandButton1_Click()
    Dim ws As Worksheet
    Dim lrow As Long, i As Long

    Set ws = ThisWorkbook.Sheets("Sheet3")

    With ws
        lrow = .Range("A" & .Rows.Count).End(xlUp).Row

        For i = 4 To lrow
            If Application.WorksheetFunction.CountA(.Range("C" & i & ":E" & i)) <> 3 Then
                MsgBox "Please Enter the number of units of " & .Range("B" & i).Value & " Sold"
                Exit Sub
            End If
        Next i
    End With

    MsgBox "Data Validated"
End Sub

This is what you get when you run the code

and this when everything is filled