Hi,
Add your all string value in List<string> .
say for example,
List<string> s = new List<string>();
s.add(your string value);
up to n time, you can do it in for loop.
Then check like this,
List<string> s1 = (from a in s
where string.IsNullOrEmpty(a)
select a.ToString()).ToList();
Check s1.Count(). If > 0 means you have string with blank value.