How to determine if a string contains all unique characters using C#?

To determine if a string has a unique character, first check the word in the string against the next word -

for (int j = i + 1; j < val.Length; j++) {
   if (val[i] == val[j])
}

If a match is found, it means that character String does not contain unique characters.

If no match is found, the string contains all unique characters.

If there is a match, return false, i.e. the unique character was not found -

for (int j = i + 1; j < val.Length; j++) {
   if (val[i] == val[j])
   return false;
}

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