Want To retrieve string from my array [closed]

Answer 1

A little LINQ magic

var arr = new [] {null,"string1","string2","string3",null,"string4","string5","string6",null,"string7","string8","string9"};

var items = arr.Select( (item,index) => new {item, nextNull = Array.IndexOf(arr,null,index)} )
                           .GroupBy(x => x.nextNull)
                           .Where(x => x.Any(y => !String.IsNullOrEmpty(y.item)))
                           .Select(x => String.Join(" ",x.Select(y => y.item)));

Output:

string1 string2 string3
string4 string5 string6
string7 string8 string9

Live example: http://rextester.com/GOIT12899