C # generate a verification code and add random numbers and letters (domestic version)

The verification code generation method has been used before. It is no problem to take four digits. The result is followed by a letter. After taking six digits, the efficiency is very low.

The method is improved as follows:
Copy codeThe Code is as follows:
Var text2 = "";
Var random = new Random (int) DateTime. Now. Ticks );
Const string textArray = "23456789 ABCDEFGHGKLMNPQRSTUVWXYZ ";
For (var I = 0; I <iVcodeNum; I ++)
{
Text2 = text2 + textArray. Substring (random. Next () % textArray. Length, 1 );
}
Return text2;