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When compare the string with not sure that the case of the string like (”aAa”, “aaa”, “AAA”). Normally I used the string.ToLower() to manage this problem but there’re many way to solved this. Look at my code below.

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string.Compare(s1, s2, true)

This function return integer.
s1 > s2 then return 1
s1 < s2 then return -1
s1 = s2 then return 0
The 3rd pamerater is the "ignoreCase" then set it true to non-case sensitive

Example

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string s1 = "aAa";
if (s1.Equals("aaa")) // false because the case sensitive
{
    // do something
}
else if (s1 == "aaa") // false because the case sensitive
{
    // do something
}
else if (string.Compare(s1, "aaa", true) == 0) // true enable non-case sensitive
{
    // do something
}

This is my latest resume.

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This project show how to keep the object with double linked list

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