InfoPath Dev

I create List form Template i want to add External Data Picker but this control not showing for List Form Template is any one know why?

The controls available in SharePoint List forms in InfoPath is a subset of the controls allowed in a regular InfoPath form. I'd assume that the external data picker is not supported in list forms.

I want to show external List data in my List form so how can i achieve this?

If you just need to display the data, can't you simply create a data connection in the form for that?

Ok thanks i try this.

I want to perform Search functionality.In my drop Down list box contains no of item i want to give search functionality for that user can enter some value if that value is contains in dropdown i want to set drop down value.