unable to find list templates programatically

Hi

All my List templates are available at:

http://xyz:1234/_catalogs/lt/Forms/AllItems.aspx

But programmatically I tried to find the list templates using the code below

SPListTemplate template123 = _objSPWeb.ListTemplates["abc"];

while debugging I tried to check the list templates using that code but it is not showing.

Please help

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