'CBLservicetype' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value

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ASP.NET

here i am using checklist box but when i run the program i got error.....

here my save code is...

cmd.Parameters.AddWithValue("@servicetype",STservice.ToString());


checklist code...

STservice = string.Empty;
       foreach (ListItem item in this.CBLservicetype.Items)
           if (item.Selected)
               STservice += item + ", ";

If u find any solution kindly help me... thank you