Identify checkbox.checked = True in a datagridview

I have a datagridview that uses a SQL query as the data source.  The last column of the datagridview is a checkbox column.  The code to generate the window is this:

        Dim cmd As SqlClient.SqlCommand = New SqlClient.SqlCommand
        cmd.Connection = cn
        cmd.CommandType = CommandType.Text

        cmd.CommandTimeout = 0

        Dim dataAdapter As SqlDataAdapter = New SqlDataAdapter(cmd.CommandText, cn)
        dataAdapter.SelectCommand.CommandTimeout = 0
        Dim builder As SqlCommandBuilder = New SqlCommandBuilder(dataAdapter)
        Dim table = New DataTable
        table.Locale = System.Globalization.CultureInfo.InvariantCulture
        dataAdapter.SelectCommand.CommandTimeout = 0
        dgvAddWindow.AutoGenerateColumns = False

        dgvAddWindow.Columns.Add(New DataGridViewTextBoxColumn With {.DataPropertyName = "ORDER_NUMBER", .Name = "Order Number"})
        dgvAddWindow.Columns.Add(New DataGridViewTextBoxColumn With {.DataPropertyName = "LINE_NUMBER", .Name = "Line Number"})
        dgvAddWindow.Columns.Add(New DataGridViewTextBoxColumn With {.DataPropertyName = "QUANTITY", .Name = "Quantity"})
        dgvAddWindow.Columns.Add(New DataGridViewCheckBoxColumn With {.DataPropertyName = "ADD_WINDOW", .Name = "Add Window"})

        AddWindowSource.DataSource = table
        dgvAddWindow.DataSource = AddWindowSource

After selecting rows by checking the checkboxes, and then clicking a Process button, I need to do two things:

1.  Count the number of checkboxes that have been checked.
2.  For each checkbox that has been checked, run some other processes.

I know how to run the other processes, but I don't know how to cycle through the rows and see if the DataGridViewCheckBoxColumn is checked.  Thanks for your help.

T HoecherlDeveloperAsked:
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Karrtik IyerSoftware ArchitectCommented:
Something like below:
 Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        For Each row As DataGridViewRow In _dgvProdBatch.Rows
'Use column name in Cells ("Your col Name") which has check box
            If Convert.ToBoolean(row.Cells("ADD_WINDOW").Value) = True Then   
                MsgBox(row.Cells(0).Value.ToString()) 'Karrtik: Do you work, run other processes
            End If
    End Sub

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T HoecherlDeveloperAuthor Commented:
This is what I have for testing:

    Private Sub btnAdd_Click(sender As System.Object, e As System.EventArgs) Handles btnAdd.Click
        For Each row As DataGridViewRow In dgvAddWindow.Rows
            If Convert.ToBoolean(row.Cells("Add Window").Value) = True Then
                MsgBox("Not Checked")
            End If
        Exit Sub
 If the box is checked, I get the msgbox("Checked"), as expected.  But if the box is unchecked I get the attached error.

T HoecherlDeveloperAuthor Commented:
I figured it out.  This is what I used:

        For i As Integer = 0 To dgvAddWindow.Rows.Count - 2
            If dgvAddWindow.Rows(i).Cells(3).Value.ToString() = "" Then
                x = x
                x = x + 1
            End If

Karrtik IyerSoftware ArchitectCommented:
The reason you got that error was when check box is not selected, the value expected while debugging for that column is 0, only then convert to boolean code shall work for both cases, when checked as well as unchecked. It seems in your current case for checked it is coming as 1,but for unchecked cases it is coming as empty string instead of 0.
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