Question

how to notice if "abcDEf" different that "abcdef" ?

in C# winforms ?

thank’s in advance

Answer 1

bool aredifferent = "abcDEf" != "abcdef";
//OR
string str1 = "abcDEf", str2 = "abcdef";
bool aredifferent2 = str1 != str2;

.NET string equality operator is case sensitive, so simply using it will return false if string differ in case.

If, however, you are looking to determining if two strings are the same, but only differ in case, then you could use something like this:

bool differInCase = string.Compare(str1, str2, /*ignoreCase=*/true) == 0 &&
                    string.Compare(str1, str2, /*ignoreCase=*/false) != 0;;