Combine two lists in one form (1 to Many relation)

Question

I have two list instances. I have a custom form on which I would like to show two lists and add more button to let user select to add more child records and save which should save in both the lists. And again when user pull the item from main list it should
display the child list items as well. Can someone point me good link to achieve this.
Thanks,
Alex

Answer 1

Hi,
According to your description, my understanding is that you want to display two lists in a form and add item to both lists when clicking a button, also
you want to display items in child list when searching items from main list.
If that is the case, there is a possible solution is that you can create a custom web part with two Gridviews bind with the lists data and a button. When
you click button, you can add list items to both grid in code behind. And, when you search the items from main gridview , you can query the list items value in child list using CAML Query to display the items in child list.
Here are some detailed code demos for your reference:
Create a custom web part:
http://msdn.microsoft.com/en-us/library/ee231519.aspx
Add or update list items using C#:
http://msdn.microsoft.com/en-us/library/office/ee539976(v=office.14).aspx
Query list item using CAML Query:
http://msdn.microsoft.com/en-us/library/office/ee534956(v=office.14).aspx
Bind SharePoint list data to GridView:
http://sharepoint.kerenapura.com/2013/09/display-sharepoint-list-data-gridview/
Best regards
Zhengyu Guo
TechNet Community Support