How to Generate Random Number in C#

We can generate random numbers in c# with help of " RNGCryptoServiceProvider " class. Random number like (123456789) , (ABSCDEFGHIJKLMNOPQRSTUVWXYZ) or special characters.

using System.Security.Cryptography;
public string GetUniqueKey(int maxSize, char[] chars)
{
    //int maxSize for length of string
    //char[] chars for contains value for generate our randon number
    byte[] data = new byte[1];
    RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider();
    crypto.GetNonZeroBytes(data);
    data = new byte[maxSize];
    crypto.GetNonZeroBytes(data);
    StringBuilder result = new StringBuilder(maxSize);
    foreach(byte b in data)
    {
        result.Append(chars[b % (chars.Length - 1)]);
    }
    return result.ToString();
}
public void GenerateNumericNumber()
{
    string NumericNumber = GetUniqueKey(10, "123456789".ToCharArray());
}
public void GenerateAlphaNumber()
{
    string alphanumber = GetUniqueKey(10, "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray());
}
public void GenerateSpecialCharNumber()
{
    string SpecialCharNumber = GetUniqueKey(10, "!@#$%^&*()".ToCharArray());
}