How to ignore case sensitivity in StartsWith for LINQ FindAll?

Question

I have the following code:

ContactList = ContactList.FindAll(p => p.DeptName.StartsWith(optAlpha.SelectedItem.Value)).ToList();

If DeptName="test" and optAlpha.SelectedItem.Value="T", it doesn't work.

I tried with the following code, still doesn't work.

ContactList = ContactList.FindAll(p => p.DeptName.ToLower().StartsWith(optAlpha.SelectedItem.Value.ToLower())).ToList();

Answer 1

Just use

StartsWith(optAlpha.SelectedItem.Value, StringComparison.InvariantCultureIgnoreCase);

and it will ignore the case during the default comparison.

Answer 2

No need to use ToLower you can just call an overload of starts with and pass it StringComparison.InvariantCultureIgnoreCase as the second arg (first being the string to compare). Here's the docs on string comparison options; http://msdn.microsoft.com/en-us/library/system.stringcomparison(v=vs.110).aspx