How can I do a case insensitive string comparison?

How can I make the line below case insensitive?

drUser["Enrolled"] = 
      (enrolledUsers.FindIndex(x => x.Username == (string)drUser["Username"]) != -1);

I was given some advice earlier today that suggested I use:

x.Username.Equals((string)drUser["Username"], StringComparison.OrdinalIgnoreCase)));

the trouble is I can't get this to work, I've tried the line below, this compiles but returns the wrong results, it returns enrolled users as unenrolled and unenrolled users as enrolled.

drUser["Enrolled"] = 
      (enrolledUsers.FindIndex(x => x.Username.Equals((string)drUser["Username"], 
                                 StringComparison.OrdinalIgnoreCase)));

Can anyone point out the problem?

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This is not the best practice in .NET framework (4 & +) to check equality

String.Compare(x.Username, (string)drUser["Username"], 
                  StringComparison.OrdinalIgnoreCase) == 0

Use the following instead

String.Equals(x.Username, (string)drUser["Username"], 
                   StringComparison.OrdinalIgnoreCase) 

MSDN recommends:

Use an overload of the String.Equals method to test whether two strings are equal.

Use the String.Compare and String.CompareTo methods to sort strings, not to check for equality .

---

你应该使用如下的静态String.Compare函数

x => String.Compare (x.Username, (string)drUser["Username"],
                     StringComparison.OrdinalIgnoreCase) == 0

---

请使用这个比较：

string.Equals(a, b, StringComparison.CurrentCultureIgnoreCase);

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