How to delete every 2nd character in a string?

Question

How to delete every 2nd character in a string?

For example:

3030313535333635  -> 00155365
3030303336313435  -> 00036145
3032323437353530  ->         


        

Answer 1

Using a StringBuilder to create a string will save resources

string input = "3030313535333635";
var sb = new StringBuilder(8); // Specify capacity = 8
for (int i = 1; i < 16; i += 2) {
    sb.Append(input[i]);
}
string result = sb.ToString();