C # Generate verification code to take random numbers plus letters (improved version) _ Practical Tips

has been used to generate the verification code method, take 4 digits no problem, the result plus the letter, take 6 digits, the efficiency is very low.

Improved a bit, the method is as follows

Copy Code code as follows:

var text2 = "";
var random = new Random ((int) DateTime.Now.Ticks);
Const string Textarray = "23456789ABCDEFGHGKLMNPQRSTUVWXYZ";
for (var i = 0; i < ivcodenum; i++)
{
Text2 = Text2 + textarray.substring (random. Next ()% textarray.length, 1);
}
return text2;