Disabling Case sensitivity for my keyword search

This question already has an answer here:

Case insensitive 'Contains(string)' 22 answers

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Let's say there is a boolean property CaseSensitive identifying the search mode. Then you can use string.IndexOf to solve this by setting the StringComparison correctly:

StringComparison comparison = CaseSensitive ?
    StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
if (value.Value.IndexOf(txtFilterValue.Text, comparison) >= 0)
{
    //Returns true...
}

The whole query can be simply written with LINQ like

private void GetFilteredResults(MessageDetails detail, FilterEventArgs e)
{
    bool comparison = CaseSensitive ?
        StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
    return detail.MessageValue.Any(v => v.Value.IndexOf(txtFilterValue.Text, comparison) >= 0);
}

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