how to count the total number of checked data grid view check boxes by rows not by columns

Question

We are currently doing a student monitoring attendance , and we want to count the total number of days each student is present and absent .

     Subject LN  FN    MI  05/21/14   05/20/14   05/21/14 05/22/14  05/23/14  P  A

     Comp101 Yu Erick   C   (checked|(unchecked)|(checked)|(checked)|(checked)|4 | 1

"This is what we wanted to do but instead of counting horizontally it counts vertically.Is there anyone who can help us solving this problem?

Answer 1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)  Handles Button1.Click
Dim Present As Integer = 0
Dim Absent As Integer = 0
For a = 0 To DataGridView1.RowCount - 1
    For b = 0 To DataGridView1.ColumnCount - 8
        If DataGridView1.Rows(a).Cells(b + 5).Value = True Then
            Present += 1
        Else
            Absent += 1
        End If
    Next
    DataGridView1.Rows(a).Cells(10).Value =  Present 
    DataGridView1.Rows(a).Cells(11).Value =  Absent
    Present = 0
    Absent = 0
Next
End Sub

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