C#随机颜色和随机字母

public System.Drawing.Color GetRandomColor()
    {
        Random RandomNum_First = new Random(Guid.NewGuid().GetHashCode());
        Random RandomNum_Sencond = new Random(Guid.NewGuid().GetHashCode());
        
        //为了在白色背景上显示，尽量生成深色
        int int_Red = RandomNum_First.Next(256);
        int int_Green = RandomNum_Sencond.Next(256);
        int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green;
        int_Blue = (int_Blue > 255) ? 255 : int_Blue;

        return System.Drawing.Color.FromArgb(int_Red, int_Green, int_Blue);
    }

public static string GetPageName()
    {
        string strRand = String.Empty;
        System.Random random = new Random(Guid.NewGuid().GetHashCode());
        string str = "qwertyuiopasdfghjklmnbvcxz";
        for (int i = 0; i < 6; i++)
        {
            strRand += str[random.Next(0, 25)].ToString();
        }
        return strRand;
    }