linq - C# String.IndexOf returns only one element when result from list is may -

i have list of strings, retrieved database , wanted filter list list items have text contained in them. string.contain have been perfect case sensitive. expect many results returned 1 is. here code snippet

if (!string.isnullorwhitespace(searchterm))     list = list.where(a => a.description.indexof(searchterm, stringcomparison.ordinalignorecase) >= 0         || a.part.modulename.indexof(searchterm) >= 0).tolist(); 

i appreciate in figuring out whats going on.

you're ignoring case on first of 2 calls indexof. removing expected results.

try adding both:

if (!string.isnullorwhitespace(searchterm)) {     list = list.where(a => a.description.indexof(searchterm, stringcomparison.ordinalignorecase) >= 0         || a.part.modulename.indexof(searchterm, stringcomparison.ordinalignorecase) >= 0).tolist(); }