highlight row on one sheet if name in column matches on another sheet within same workbook

the correct coding is:
Sub RunMe()
Dim lRow1, lRow2, x As Integer

lRow2 = Sheets("MC").Range("C" & Rows.Count).End(xlUp).Row
Sheets("Directory").Activate
lRow1 = Range("C" & Rows.Count).End(xlUp).Row
x = 1

For Each cell In Range("C2:C" & lRow1)
Do
x = x + 1
If cell.Value = Sheets("MC").Cells(x, "C") Then
Rows(cell.Row).Interior.ColorIndex = 3
End If
Loop Until x = lRow2
x = 1
Next cell

End Sub