Error - in order to evaluate an indexed property, the property...

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VB

Hello,
I'm getting the error below in a grid. Not as a run-time error, in fact there's no error displayed at all. The only way I know about it is because I investigated why I wasn't getting the desired result my code should have produced.

"Error - In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user."

Specifically, what I'm trying to do is change the color of a cell, of a grid row, which contains an error, during the binding event, so the user sees where the error lies.

Private Sub ValidateGridRow(row As GridViewRow)
    Dim dateValue As Date
    'Gender...
    If Not row.Cells(5).Text.Trim() = "M" Or
         Not row.Cells(5).Text.Trim() = "F" Then
        row.Cells(5).BackColor = Drawing.Color.PaleVioletRed
        bGridValid = False
    End If
    If row.Cells(5).Text.Trim() = "" Then
        row.Cells(5).BackColor = Drawing.Color.PaleVioletRed
        bGridValid = False
    End If
    'Zip code...
    If row.Cells(10).Text.Trim() = "" Or
        row.Cells(10).Text.Trim().Length < 5 Then
        row.Cells(10).BackColor = Drawing.Color.PaleVioletRed
        bGridValid = False
    End If
    If Not IsNumeric(row.Cells(10).Text.Trim()) Then
        row.Cells(10).BackColor = Drawing.Color.PaleVioletRed
        bGridValid = False
    End If
    'DOB...
    If Not Date.TryParse(row.Cells(6).Text, dateValue) Then
        row.Cells(6).BackColor = Drawing.Color.PaleVioletRed
        bGridValid = False
    End If

End Sub

What I have tried:

I've read other posts across the web regarding this issue but the majority were in C# and that's not my forte and the others had other things going on I didn't understand. I'm a newbie so I need a little help please.

Thanks in advance for your time and help.
Red