How to identify how many character in the datagridview cell in VB.NET

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VB

how to check the cell if contains a value or has a how many strings in a cell

sample

id head
1 11

if head column has less than or equal to 1 string then

else

end if

What I have tried:

Dim columnName As String = dgvResults.Columns(e.ColumnIndex).Name
Dim cellVal As String = e.FormattedValue.ToString()
If e.ColumnIndex = 0 AndAlso cellVal.Length <> 5 Then
    e.Cancel = True
    MessageBox.Show(columnName & " must be 5 Digits Long!")
End If