Merge List<string> with List<object[]>

Question

@Jack J Jun ,I am trying to merge two lists together to create a fresh new list but i am out of idea how to merge both of them to create a new list. please suggest me the code .
list 1 declaration

  List<object[]> listnew = new List<object[]>();  

data in the list 1

list 2 declaration

    List<string> list1 = new List<string>(); // just for sub-headings   

data in the list 2

what i am trying to achieve is

Answer 1

@ankit goel , Welcome to Microsoft Q&A, you could try to define Dictionary<string, List<string>> to get the wanted data.

Here is a code example you could refer to.

 Dictionary<string, List<string>> dic = new Dictionary<string, List<string>>();  
            for (int i = 0; i < list.Count; i++)  
            {  
                string key = list[i];  
                List<string> l = new List<string>();  
                foreach (var item in listnew)  
                {  
                    if (item[0].ToString().Contains(key))  
                    {  
                        l.Add(item[0].ToString().Replace(key, ""));  
                    }  
  
                }  
                dic.Add(key, l);  
            }  

Result:

Best Regards,
Jack

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