Something like:
Private Sub List7_DblClick(Cancel As Integer)
Dim listrs As Integer
Dim listsum As Integer
listrs = Me![List7].ListCount
x = 1
Do
If Me![List7].Column(2,x) = 1 Then
listsum = listsum + 1
x = x + 1
Else
x= x+1
End IF
Loop Until x = listrs
Me![Text9].Value = listsum
End Sub
You can highlight Column and hit the F1 to see examples of the property.
The Column property starts (column,row) at 0.
This code assumes column headers thus x = 1.