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Is it safe to use the attributes collection of a web control to store extra data?
e.g.
DropDownList ddl = new DropDownList();
ddl.Attributes.Add("ExtraData", "SomeData");
I would recommend against it as these attributes may be prone to tampering. Instead, you should have a list of objects on the server in which each object stores both the drop down text data as well as the extra data in it.
You can then use the index of the drop down to determine which object in your list on the server is selected. Typically, frontend controls should never contain anything but display data and indexes if you can help it. This is why datagrids have a data index column, so you can retrieve the index of the record that corresponds to the row. The record itself is not stored in the grid, only its fields are displayed.