In visual studio, I had a drop down list whose data source was connected to a LINQ query. Because there are many records, the client ask for a searchable control. I have replaced the drop down list with MultipleLookupField in the ascx page in visual studio. How can I bind this control to a data source? Is it possible to show checkbox beside each records?
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Instead of using MultipleLookupField, would you prefer to use AutoComplete on a textbox control? You can use CAML query to filter the data. Complete doc is at sympmarc.github.io/SPServices/value-added/SPAutocomplete.html – Ahmad Zia Dec 29 '17 at 7:23
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Did you create visual web part in SharePoint 2010, SharePoint 2013 or SharePoint 2016?
Per my test in my SharePoint 2013 environment, then I cannot find the SharePoint:MultipleLookupField control which can be added when creating visual web part.
You could add the control and bind the data source using C# code in code behind. There is a similar post:
