Covert string to boolean for checkbox in asp.net

how to convert a string to boolean if I have two different fields (szValue and szDefault Value) in one checkbox??

<asp:templatefield HeaderText="Value">
               <itemtemplate>
                   <asp:CheckBox ID="ckbValue" runat="server"  CssClass="pkchkbox" ></asp:CheckBox>
               </itemtemplate>
           </asp:templatefield>

DataTable dt = new DataTable();

*.aspx.cs
foreach (DataRow row in m_dt.Rows)
{
    if (row[1].ToString() == "Y")
    {
        row[1] = true;

        //row[1] = true;
    }
    else if (row[1].ToString() == "N")
        row[1] = false;
}