Search based on multiple selection of checkbox in sharepoint 2010

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C#3.0

C#

hi,

I ve a check box list in that user can select multiple options. I want to filter using row filter.
For single selection it is working fine for mulitple selection it is not working.
Please see this issue

foreach (ListItem item in chkAvailableShift.Items)
                    {
                        if (item.Selected)
                        {
                            //Response.Write("selectedItem:" + item.Selected.ToString());
                            dv.RowFilter = "Available_x0020_Shift = '" + chkAvailableShift.SelectedItem.Text + "'";
                        }
                    }