How get CheckBox value from ASPxGridView

Question

I've ASPxGridView with data from Data Base. I've add one column with CheckBox yet. And I'm have button with action onClick. I'm want when i press button was performed this code

GridViewDataColumn dataColumn = ASPxGridView1.Columns[3] as GridViewDataColumn;

        for (int i=0;i<ASPxGridView1.VisibleRowCount;i++)
        {
            DataRow row = ASPxGridView1.GetDataRow(i);
            SqlCommand command = new SqlCommand("update Student set Enable=" + (Convert.ToBoolean(row["Enable"]) ? "0" : "1") + " where id=" + row["id"].ToString(), connection);
            ASPxCheckBox box = ASPxGridView1.FindRowCellTemplateControl(i, dataColumn, "cb") as ASPxCheckBox;
            if (box!=null && box.Checked)
            {
                connection.Open();
                command.ExecuteNonQuery();
                connection.Close();
            }

        }

But variable Box always have checked false. Even when CheckBox should matter true. This ASPxGridView

<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1">
            <Columns>
                <dx:GridViewDataTextColumn FieldName="id" ReadOnly="True" VisibleIndex="0">
                    <EditFormSettings Visible="False" />
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="FName" VisibleIndex="2">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="LName" VisibleIndex="3">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn Caption="#" VisibleIndex="1">
                <DataItemTemplate>
                    <dx:ASPxCheckBox ID="cb" runat="server" >
                    </dx:ASPxCheckBox>
                </DataItemTemplate>
            </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="Phone" VisibleIndex="5">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="Email" VisibleIndex="6">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataCheckColumn FieldName="Enable" Visible="False" VisibleIndex="7" Name="Enable">
                </dx:GridViewDataCheckColumn>
            </Columns>
        </dx:ASPxGridView>

I'll want to mark the necessary rows and updat table if box.checked=true. How this doing another way i'm don’t understand. Thanks.

Answer 1

After row DataRow row = ASPxGridView1.GetDataRow(i) all checkBoks become false, because on second cicle if false.