default.aspx
<asp:CheckBoxList ID="chkno" runat="server" Style="font-family: cal; font-weight: 700">
<asp:ListItem style="font-family: Calibri;">Father</asp:ListItem>
<asp:ListItem style="font-family: Calibri;">Mother</asp:ListItem>
<asp:ListItem style="font-family: Calibri;">Residence</asp:ListItem>
</asp:CheckBoxList>
default.aspx.cs string modids = "";
for (int i = 0; i < chkno.Items.Count; i++)
{
if (chkno.Items[i].Selected)
{
if (modids.Length == 0)
{
modids = chkno.Items[i].Value;
}
else
modids = modids + "," + chkno.Items[i].Value;
}
}
cmd.Parameters.AddWithValue("@Emergency_Contact", modids);
Output: